Expandable Graphite Flame Retardant
| HS Code | 336488 |
| Appearance | Typically black or dark gray powder |
| Particle Size | Varies, usually in the range of a few micrometers to millimeters |
| Thermal Stability | High, can withstand elevated temperatures before decomposition |
| Flame Retardant Mechanism | Expands upon heating to form an insulating char layer |
| Chemical Composition | Mainly graphite intercalation compounds |
| Moisture Absorption | Relatively low moisture absorption |
| Ph | Neutral to slightly acidic in aqueous suspension |
| Ash Content | Low ash content |
| Solubility | Insoluble in most common solvents |
| Compatibility | Good compatibility with many polymers |
As an accredited Expandable Graphite Flame Retardant factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Expandable Graphite Flame Retardant: 5 - kg bags for secure and convenient packaging. |
| Storage | Expandable Graphite Flame Retardant should be stored in a cool, dry place away from heat sources and ignition points. Keep it in a well - sealed container to prevent moisture absorption, which could affect its performance. Avoid storing near reactive chemicals. This storage method helps maintain its quality and effectiveness over time. |
| Shipping | Expandable Graphite Flame Retardant is shipped in well - sealed containers, safeguarded against moisture and physical damage. Shipment adheres to strict chemical transportation regulations to ensure safe delivery. |
Competitive Expandable Graphite Flame Retardant prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615380400285 or mail to sales2@liwei-chem.com.
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Tel: +8615380400285
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Historical Development
The art of fire prevention has existed since ancient times. In recent times, the process has improved. The expandable graphite was created by a new method. Beginning in the late 19th century, workers used graphite plus sulfuric acid, nitric acid, etc., to obtain an expandable body, which expanded in case of fire and formed a charcoal layer to contain flames. In the 20th century, Western scholars continuously improved its preparation and application, such as the types of oxidants and technological processes, which were increasingly perfected. Expandable graphite is then widely used in plastics, rubber, copper clad laminates, and fire retardant coatings. With its flame retardant, low smoke, and halogen-free characteristics, it has been relied on by many fires. In recent years, technology has flourished, and both China and foreign countries are competing for innovation. It not only emphasizes expansion efficiency, but also seeks to be environmentally friendly. There are those who are compounded with other flame retardants Expandbale Graphite history, so far flourishing, endless prospects.
Product Overview
This product is called expanded graphite flame retardant. It is made of high-quality natural flake graphite and has been specially chemically treated. In case of high temperature in fire, it can expand rapidly to form a dense carbon layer to block heat sources and oxygen, delay combustion, and inhibit the emission of harmful gases. Its performance is stable, and it can be fused with a variety of polymer materials. It is widely used in plastics, rubber, composite panels, etc., such as cable sheathing, building decoration, transportation and other fields. It is simple to use, does not damage the performance of raw materials, and has the effect of green environmental protection, which meets the requirements of modern flame retardancy. The application of this agent can greatly improve the safety standards of products and reduce fire hazards. It is the best choice for flame retardancy in the Pliocene.
Physical & Chemical Properties
Expanded graphite flame retardant, gray-black flake, light in texture, with a slight metallic luster. Stable at room temperature and pressure, insoluble in water and organic solvents. Hard and brittle, with excellent electrical conductivity and thermal conductivity. Its density is between 2.2 and 2.3 grams per cubic centimeter, and it is special for expansion. It expands violently in case of fire or high temperature (about 200 ° C or more), and can reach dozens to hundreds of times the original volume. After expansion, the shape is like a worm, which is soft and porous, and the benefits of heat insulation and flame retardancy are greatly increased. Chemical properties are relatively stable, and it can resist acid and alkali erosion. It may react when it encounters strong oxidants. Composite with polymer materials or plastics, etc., can significantly improve its flame retardant performance and burn involuntarily. Weak smell, no odor, excellent environmental compatibility.
Technical Specifications & Labeling
The name of this product is expanded graphite flame retardant, which takes the work of expansion and is specially designed for fire prevention and flame suppression. The raw materials are refined, the carbon content is more than 95% higher, and the initial expansion temperature is 180 to 230 degrees Celsius. The particle size can be adjusted according to needs, and the common mesh is 80 to 300. The expansion ratio is more than 200 times, and it expands significantly in case of fire, forming a carbon layer, cutting off oxygen and preventing the spread of fire. Ash content is less than 3%, and sulfur content is less than 3/1000. Appearance is black, odorless and non-toxic, and loosely dispersed. It is suitable for many fields such as plastics, rubber, paints and building materials. The packaging is mostly in composite woven bags, each bag is 25 kilograms, and can also be packaged separately according to customer needs. Store in a dry and ventilated place, away from humid acid and alkali impur
Preparation Method
Based on graphite, a pure powder is taken, mixed with sulfuric acid, nitric acid and several oxidants, and placed in a corrosion-resistant vessel. Slowly add heat to make the sulfuric acid penetrate between the graphite layers. Then an acid etchant is added, such as potassium permanganate and potassium dichromate, to promote the rolling reaction. It must be stirred evenly. Once the graphite expands, the layer spacing is large, and expandable graphite can be produced. In the process, a strong oxidant catalyzes the layering and insertion reaction of graphite. The principle is that the strong acid embeds ions and functional groups into the graphite sheet, breaking its van der Waals force. With heating, the embedding evaporates, and gas is suddenly generated, causing the graphite to expand instantaneously like a worm. Finally, washed and dried with water, it forms an expanded flame retardant graphite, which can be applied to polymer
Chemical Reactions & Modifications
Expanded graphite, taken from natural flake graphite, is chemically treated with acidic reagents such as sulfuric acid and nitric acid, and is embedded between layers to obtain graphite intercalation compounds. In case of high temperature in fire, the intercalation decomposes and precipitates gas, and the graphite layer expands rapidly to form porous carbonaceous and form a thermal insulation and flame retardant barrier. However, its nature is hydrophobic, easy to disperse unevenly, and the performance of the mixed resin system is limited. In order to enhance compatibility, it is mostly modified by oxidation, grafting, etc. It is often grafted on the surface of graphite with functional groups such as silane coupling agents, carboxyl groups, and hydroxyl groups, which not only enhances the affinity interface, but also imparts functionality. After this modification, the expanded graphite is more firmly combined with the polymer matrix, and the flame retardant efficiency and mechanical properties are increased. It is widely used in
Synonyms & Product Names
Expanded graphite flame retardant is also a good product of physical flame retardant. Its title has different names and is circulated in the world. Or expandable graphite, or expandable graphite, is also called Expandable Graphite, which is a Western translation of the name; there are also graphite expansion flame retardant, flame retardant expanded graphite, etc., all refer to things. Commodities are distributed in the market, and the label may be Expandable Graphite Flame Retardant, or simply EG Flame Retardant, also known as "Graphite Flame Retardant". In its essence, expanded graphite expands when heated to form a honeycomb-like barrier, so it is good to isolate oxygen and slow down combustion. It is widely used in plastics, rubber, fibers and other materials. The popular trade names are expandable graphite flame retardant, expanded graphite, etc. Although the name is special, the essence is the same.
Safety & Operational Standards
Extended graphite flame retardant, chemically slightly sensitive, expands in case of fire, often used in the field of fire protection. Handling Sipin requires caution and follow safety rules. When taking this product for the first time, you must wear protective clothing, gloves, protective glasses, and cover your mouth and nose to prevent dust. Storage should be in a dry and ventilated place, away from water, fire and moisture, and do not mix with strong oxidants or acids and alkalis. Before enabling, it is advisable to carefully check whether the package is intact. If it is broken, do not use it indiscriminately. The operation room should be kept clean and equipped with ventilation devices. Fireworks are strictly prohibited. When touching this product, handle it with care and do not rub it strongly to prevent the release of dust. If it stains the skin, rinse it with water quickly and do not rub it forcefully. Mistakenly into the eyes, in a hurry to wash with flowing water for a few minutes, those who are still in pain, go to the doctor immediately. Dispose of the remaining residue in accordance with environmental regulations, do not discard it in water and soil. Move a large amount, it is advisable to use special equipment to prevent leakage. In case of fire, dry powder and carbon dioxide fire extinguishers are used to rescue, and water is forbidden to prevent it from expanding and scattered. Store for a long time, every other month, you must check the moisture, if there is agglomeration or discoloration, you must dispose of it immediately. After all operations, after the completion of work, it is advisable to organize the debris, change clothes and clean hands to nourish the body. Appeal to all workers, always be vigilant of subtle risks, abide by the rules, and keep a few materials safe, so that people will not have disasters.
Application Area
Expanded graphite flame retardant has excellent performance and is widely used in many fields. In building materials, it is mixed with foam board and gypsum board to increase its fire resistance effect. It expands in case of fire and isolates heat sources. In plastics and rubber products, it can improve flame retardant performance and enhance safety. In the field of electronic devices, it has good electrical conductivity and is used in cable sheathing and fireproof coatings to prevent the spread of fire. In the transportation industry, it is suitable for interior materials of high-speed rail, aviation and ships to prevent fires. And it is suitable for textiles, coatings, sealing materials and other products. It can be seen wherever flame retardant is required. It is halogen-free and environmentally friendly, both efficient and safe. It is good for ecology and human use. Its application is increasingly broad and favored by all walks of life.
Research & Development
In the past, the craftsmanship is changing day by day, and all materials are used for stability. Graphite can be swollen, because of its microstructure, it can resist the spread of fire. Scholars have studied its changes, analyzed its contents, and tried to infiltrate it with acid, or with the help of various salts, so that the graphite layer can swell. When heated, it grows a hundred times, forming a cicada's wing shape, flame retardant and fire shielding. Applied to plastic coatings, it not only keeps the shape contained, but also resists the invasion of flames. In recent years, we have developed and refined, or explored green formulas, or tried high-efficiency processes, hoping to make the environment safe and effective. So Expandable Graphite Flame Retardant is widely used in examples to help people overcome fire and is committed to living in peace.
Toxicity Research
Expanded graphite flame retardants are based on graphite. They are treated chemically and expand rapidly in case of fire, which can isolate oxygen and inhibit combustion. However, its toxicity cannot be ignored. According to the test, expanded graphite itself has low toxicity, but the preparation process may be doped with antimony, sulfuric acid and other additives, and harmful gases, such as sulfur dioxide and trace organic volatiles, may be precipitated during combustion. Its acute toxicity to the human body is minimal, but long-term exposure or high-dose exposure can easily cause respiratory irritation or skin allergies. Animal experiments have shown that long-term inhalation at low doses has no significant effect on physiological functions. And after environmental release, graphite particles may also hide ecological risks. Therefore, when using expanded graphite flame retardants, it should be well ventilated to prevent dust from escaping, and waste disposal should be standardized to reduce the risk of poisoning.
Future Prospects
Expanded graphite flame retardant is a treasure of today's material technology, applied to polymer synthesis, with outstanding results. Looking at the future development, its application field is increasingly broad, and the construction, transportation, electronics and other industries rely on it to improve fire safety. With the increasing awareness of green environmental protection, the non-toxic and low-smoke characteristics of expanded graphite have been paid more and more attention, and developers are competing to improve its flame retardant performance. At the same time, the production process is changing with each passing day, and the cost may be further reduced, making the popularization far and wide. Looking forward to the future, if we can integrate innovation with new materials and give them intelligent monitoring, self-healing and other functions, the application scenarios will become more and more diverse, which will lead the trend of flame retardant technology and open up a new era for human safety and sustainable development.
Where to Buy Expandable Graphite Flame Retardant in China?
As a trusted Expandable Graphite Flame Retardant manufacturer, we deliver:
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Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.
As a leading Expandable Graphite Flame Retardant supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What are the main application fields of Expandable Graphite Flame Retardant?
Expandable Graphite Flame Retardant, that is, expanded graphite flame retardant, is derived from graphite. After special chemical treatment, it expands rapidly in case of fire and high temperature, forming a porous carbon layer to isolate oxygen and inhibit the spread of fire. Its functions are extensive and the application field is also very wide. Here are the numbers as follows.
The first is the building materials industry. Because the building structure uses wood, plastic, composite panels and other flammable materials, if the expanded graphite flame retardant is used, it can quickly expand at high temperatures and form an isolation layer, which greatly enhances the fire resistance and protects the safety of human life and property. Secondly, in the field of transportation equipment, especially in automobiles, aerospace, rail trains, ships, etc. The interiors, seats, insulation panels, cable coverings, etc. of various utensils need to be protected against the risk of electric fire and friction. Expanded graphite flame retardants are widely used in them because of their high efficiency and environmental protection.
It is also used for electronic and electrical purposes. There are many modern appliances, with complicated circuits, prone to short circuits and overheating. Expanded graphite can be used in cable sheaths, switch housings, integrated boards and other parts, which can effectively prevent electrical fires and double the electrical safety. Another example is the textile industry. Modern synthetic fibers are more flammable. If expanded graphite flame retardants are added, it can slow down the spread of fire and increase safety. Clothing, tents, curtains, carpets, automotive interior fabrics, etc. all benefit.
In addition, polymers and rubber products also rely more on expanded graphite flame retardants. Plastic parts, foam materials, rubber gaskets, etc., adding flame retardant expanded graphite to their formulations can significantly improve the fire resistance and meet the needs of high standards of safety regulations. Therefore, the manufacturing and packaging industries can also be widely used for their excellent flame retardant properties.
All these, expanded graphite flame retardants have become indispensable in all fields of modern industry for their rapid expansion, environmental protection and non-toxicity. Its wide application makes it possible for the peace of human society, the consolidation of buildings, and the protection of property.
The first is the building materials industry. Because the building structure uses wood, plastic, composite panels and other flammable materials, if the expanded graphite flame retardant is used, it can quickly expand at high temperatures and form an isolation layer, which greatly enhances the fire resistance and protects the safety of human life and property. Secondly, in the field of transportation equipment, especially in automobiles, aerospace, rail trains, ships, etc. The interiors, seats, insulation panels, cable coverings, etc. of various utensils need to be protected against the risk of electric fire and friction. Expanded graphite flame retardants are widely used in them because of their high efficiency and environmental protection.
It is also used for electronic and electrical purposes. There are many modern appliances, with complicated circuits, prone to short circuits and overheating. Expanded graphite can be used in cable sheaths, switch housings, integrated boards and other parts, which can effectively prevent electrical fires and double the electrical safety. Another example is the textile industry. Modern synthetic fibers are more flammable. If expanded graphite flame retardants are added, it can slow down the spread of fire and increase safety. Clothing, tents, curtains, carpets, automotive interior fabrics, etc. all benefit.
In addition, polymers and rubber products also rely more on expanded graphite flame retardants. Plastic parts, foam materials, rubber gaskets, etc., adding flame retardant expanded graphite to their formulations can significantly improve the fire resistance and meet the needs of high standards of safety regulations. Therefore, the manufacturing and packaging industries can also be widely used for their excellent flame retardant properties.
All these, expanded graphite flame retardants have become indispensable in all fields of modern industry for their rapid expansion, environmental protection and non-toxicity. Its wide application makes it possible for the peace of human society, the consolidation of buildings, and the protection of property.
What is the Flame Retardant Mechanism of Expandable Graphite Flame Retardant?
Expandable Graphite Flame Retardant, expanded graphite as the main material, used for fireproof and flame retardant materials. Its principle has its own shape and is manifested in use. Graphite is a layered structure, heated at high temperatures, with acids and oxidizing substances between the layers. In case of fire, it decomposes rapidly, releasing non-flammable gases, layer by layer expands into "worm-like", the volume increases greatly, and the surface is covered on the substrate. In this way, when the initial fire is timely, the expanded graphite is first exposed to its heat, which stimulates its chemical reaction. The acid promotes the separation of the graphite sheets, and the gas is released, causing the layers to expand and crack. Like a cloud of smoke, it overlaps, preventing the flame from penetrating deep into the substrate.
First, expanded graphite blocks the contact between oxygen and combustible materials. The carbon layer formed after expansion is thick and dense, which is armor for the substrate, and the flame is difficult to penetrate, slowing down the spread of combustion. Second, heat isolation, because the heat transfer of the carbon layer is very slow, the substrate is not easy to heat up to the ignition point. Third, the gas released by decomposition dilutes the flammable gas in the combustion area, making the fire difficult. The three are parallel, the flame is not burned, and it is difficult to transfer heat. The material is safe and will not melt and drip.
Expanded graphite is easy to obtain, its exquisite mechanism, high temperature resistance without corrosion, environmental protection and non-toxic. It is widely used in polymer materials, construction, electronics, etc. In the field of modern fire protection, expanded graphite is based in its unique way, and countries are competing to study it in order to improve its rationality and use it widely.
Overall view of the flame retardant mechanism of expanded graphite, the essence is: when exposed to flame, it expands and isolates the layer, ensuring the safety of the substrate, and then becomes an effective flame retardant choice. As for the properties of graphite itself, it is stable and not easy to evaporate, and it is also the first choice for fireproof materials.
First, expanded graphite blocks the contact between oxygen and combustible materials. The carbon layer formed after expansion is thick and dense, which is armor for the substrate, and the flame is difficult to penetrate, slowing down the spread of combustion. Second, heat isolation, because the heat transfer of the carbon layer is very slow, the substrate is not easy to heat up to the ignition point. Third, the gas released by decomposition dilutes the flammable gas in the combustion area, making the fire difficult. The three are parallel, the flame is not burned, and it is difficult to transfer heat. The material is safe and will not melt and drip.
Expanded graphite is easy to obtain, its exquisite mechanism, high temperature resistance without corrosion, environmental protection and non-toxic. It is widely used in polymer materials, construction, electronics, etc. In the field of modern fire protection, expanded graphite is based in its unique way, and countries are competing to study it in order to improve its rationality and use it widely.
Overall view of the flame retardant mechanism of expanded graphite, the essence is: when exposed to flame, it expands and isolates the layer, ensuring the safety of the substrate, and then becomes an effective flame retardant choice. As for the properties of graphite itself, it is stable and not easy to evaporate, and it is also the first choice for fireproof materials.
How much is the Expandable Graphite Flame Retardant?
Expandable Graphite Flame Retardant is also an expanded graphite flame retardant. It is made of natural graphite and has been specially chemically treated to have the functions of thermal expansion, oxygen isolation, and combustion suppression. When used in polymer materials, such as polyethylene, polypropylene, polystyrene, epoxy resins, etc., its flame retardant performance can be significantly improved. As for the amount of addition, although it varies with the matrix material, application, and flame retardant grade, it is usually measured as a percentage of mass.
The ancients made new ones, and it must be experimentally scrutinized. According to many literatures and industry experience, the amount of Expandable Graphite added is more common between 10% and 30%, and 20% is the most commonly used midpoint. If you need to pass UL 94 V-0 and other high flame retardant standards, or require materials to have good ability to form bulging shells and protective substrates at high temperatures, you often need to increase the dosage to 25% or more. However, if you add too much, it may weaken the mechanical properties, embrittle the product, and reduce the processing fluidity. It is based on the craftsman's trade-off between flame retardancy and mechanical, molding and other properties, and set the most appropriate ratio. If it is coordinated with aluminum hydroxide, melamine, phosphorus and nitrogen series, the amount of graphite expansion can be slightly reduced, and the flame retardant performance can also be obtained.
The particle size of the raw material also affects the amount of addition. If the particle size is coarse, the expansion height is high, and the flame retardant benefit is significant; if the particle size is fine, the dispersion is good, and Therefore, the choice of particle size should also be taken into account.
The choice of flame retardant for cover is more expensive than listening to multiple parties and adapting to the material. Throughout the application of Expandable Graphite Flame Retardant in various materials, the developers of new materials all take scientific tests as the criterion, and adjust the addition ratio according to the performance standards and technological processes of different products. In general, the addition amount is mostly between 10% and 30%, and the specific situation can be high or low, depending on the needs of the product and performance constraints. If you understand this principle, you should apply it according to your own laws.
The ancients made new ones, and it must be experimentally scrutinized. According to many literatures and industry experience, the amount of Expandable Graphite added is more common between 10% and 30%, and 20% is the most commonly used midpoint. If you need to pass UL 94 V-0 and other high flame retardant standards, or require materials to have good ability to form bulging shells and protective substrates at high temperatures, you often need to increase the dosage to 25% or more. However, if you add too much, it may weaken the mechanical properties, embrittle the product, and reduce the processing fluidity. It is based on the craftsman's trade-off between flame retardancy and mechanical, molding and other properties, and set the most appropriate ratio. If it is coordinated with aluminum hydroxide, melamine, phosphorus and nitrogen series, the amount of graphite expansion can be slightly reduced, and the flame retardant performance can also be obtained.
The particle size of the raw material also affects the amount of addition. If the particle size is coarse, the expansion height is high, and the flame retardant benefit is significant; if the particle size is fine, the dispersion is good, and Therefore, the choice of particle size should also be taken into account.
The choice of flame retardant for cover is more expensive than listening to multiple parties and adapting to the material. Throughout the application of Expandable Graphite Flame Retardant in various materials, the developers of new materials all take scientific tests as the criterion, and adjust the addition ratio according to the performance standards and technological processes of different products. In general, the addition amount is mostly between 10% and 30%, and the specific situation can be high or low, depending on the needs of the product and performance constraints. If you understand this principle, you should apply it according to your own laws.
How safe is the environment for Expandable Graphite Flame Retardant?
Expandable Graphite (expanded graphite) is one of the modern flame retardant materials. It is used to improve the fire resistance of materials and is widely used in plastics, rubber, construction and many other fields. Its nature is obtained by special chemical treatment of graphite, which can expand rapidly at high temperature to form a high-volume carbon layer, which isolates oxygen and prevents the spread of flames. Compared with traditional halogen flame retardants, expanded graphite is known for its environmental friendliness. It can be used to replace halogen products, which can greatly reduce the emission of toxic and corrosive gases during combustion, which is conducive to air cleaning and operation safety.
The preparation of expanded graphite involves chemical acid treatment, but its residues can be thoroughly cleaned during the production process. The compliance producer can effectively control the emission of impurities and pollution. After being applied to products, expanded graphite has stable properties, is not easy to chemically react with the environment, and is disposed of in soil and water, and does not exfiltrate heavy metals and halogen ions, which will not cause direct damage to the ecosystem. It is flame retardant by physical expansion mechanism, and has low toxicity to human body. There is no obvious health concern in long-term use.
To investigate the performance of expanded graphite in fires, it mainly releases carbon dioxide and water vapor during combustion, and few persistent organic pollutants are formed. The combustion residue is not a hazardous waste that is difficult to treat. If compared with other flame retardants such as bromine and chlorine compounds, the environmental risk caused by expanded graphite is smaller, and the substitution trend is obvious. However, graphite raw materials are mostly mined from ore. Without proper mining management, it may also have a negative impact on the ecology. Therefore, resource utilization needs to follow a sustainable path and take into account the environmental load.
Overall, expanded graphite flame retardants have better environmental safety than traditional chemical flame retardants. They have low volatility during application and have limited harm to nature and humans. However, their production and raw material mining still need to be regulated to avoid source pollution. If green manufacturing and recycling can be combined, expanded graphite is expected to become a model of environmental protection in flame retardant technology.
The preparation of expanded graphite involves chemical acid treatment, but its residues can be thoroughly cleaned during the production process. The compliance producer can effectively control the emission of impurities and pollution. After being applied to products, expanded graphite has stable properties, is not easy to chemically react with the environment, and is disposed of in soil and water, and does not exfiltrate heavy metals and halogen ions, which will not cause direct damage to the ecosystem. It is flame retardant by physical expansion mechanism, and has low toxicity to human body. There is no obvious health concern in long-term use.
To investigate the performance of expanded graphite in fires, it mainly releases carbon dioxide and water vapor during combustion, and few persistent organic pollutants are formed. The combustion residue is not a hazardous waste that is difficult to treat. If compared with other flame retardants such as bromine and chlorine compounds, the environmental risk caused by expanded graphite is smaller, and the substitution trend is obvious. However, graphite raw materials are mostly mined from ore. Without proper mining management, it may also have a negative impact on the ecology. Therefore, resource utilization needs to follow a sustainable path and take into account the environmental load.
Overall, expanded graphite flame retardants have better environmental safety than traditional chemical flame retardants. They have low volatility during application and have limited harm to nature and humans. However, their production and raw material mining still need to be regulated to avoid source pollution. If green manufacturing and recycling can be combined, expanded graphite is expected to become a model of environmental protection in flame retardant technology.
What are the precautions for Expandable Graphite Flame Retardants during processing?
Expandable Graphite Flame Retardant (expanded graphite flame retardant) should be carefully reviewed when processing and applying to ensure proper process and excellent performance. Its special properties can expand rapidly at high temperatures, forming a porous carbon layer in case of fire, blocking oxygen and inhibiting combustion, so it is widely used in resins, plastics, rubber and other materials. If you want to use it properly, you need to keep a number.
First, you must check the purity and particle size of expanded graphite. If the particle size is too fine, it is easy to cause uneven distribution, which affects the flame retardant effect. If the particle size is too coarse, it will be difficult to disperse and compound, which will affect the molding of the product. Medium particle size should be selected and few impurities should be ensured. Second, the expanded graphite should not be humid, and should be stored in a dry and ventilated place. It must be dried before processing. If it absorbs moisture, it is easy to coalesce into a group, and it is difficult to mix evenly in the substrate. And wetness can easily lead to changes in raw materials and reduce flame retardancy.
Third, the temperature during processing should not be too high. The foaming temperature of expanded graphite is low. If the material temperature or mold temperature slightly exceeds the appropriate limit, there is a risk of early expansion, which will make the process difficult to control, the product molding is not beautiful, or even damage the equipment. When compatible, it is necessary to take into account the dispersion of graphite, and to carefully grasp the stirring speed and feeding sequence, step by step, in order to ensure uniform compounding and no agglomeration.
Fourth, the equipment should be made of wear-resistant materials, and regular inspection and maintenance. Expanded graphite particles are sharp, and it is easy to wear parts after long-term operation. Therefore, all departments need to check frequently to prevent process disorders caused by equipment aging. Fifth, choose appropriate additives to assist the flame retardant to be compatible with the matrix, improve the dispersion efficiency, and reduce the negative impact on the physical properties of products, especially plasticizers, coupling agents, etc. are commonly used.
Sixth, the processing environment must be properly dustproof and ventilated. Expanded graphite dust is light and fine, and it is easy to disperse and injure the operator's respiratory tract. It is appropriate to wear labor protective equipment to prevent direct contact with the skin after inhalation. Waste gas after processing should also be disposed of in accordance with environmental protection standards and should not be discharged arbitrarily to avoid damage to the environment.
In short, the application of expanded graphite flame retardants depends on the selection of excellent materials, suitable environment, intact equipment, rigorous craftsmanship, and strict adherence to safety regulations, in order to give full play to its strengths and ensure product quality.
First, you must check the purity and particle size of expanded graphite. If the particle size is too fine, it is easy to cause uneven distribution, which affects the flame retardant effect. If the particle size is too coarse, it will be difficult to disperse and compound, which will affect the molding of the product. Medium particle size should be selected and few impurities should be ensured. Second, the expanded graphite should not be humid, and should be stored in a dry and ventilated place. It must be dried before processing. If it absorbs moisture, it is easy to coalesce into a group, and it is difficult to mix evenly in the substrate. And wetness can easily lead to changes in raw materials and reduce flame retardancy.
Third, the temperature during processing should not be too high. The foaming temperature of expanded graphite is low. If the material temperature or mold temperature slightly exceeds the appropriate limit, there is a risk of early expansion, which will make the process difficult to control, the product molding is not beautiful, or even damage the equipment. When compatible, it is necessary to take into account the dispersion of graphite, and to carefully grasp the stirring speed and feeding sequence, step by step, in order to ensure uniform compounding and no agglomeration.
Fourth, the equipment should be made of wear-resistant materials, and regular inspection and maintenance. Expanded graphite particles are sharp, and it is easy to wear parts after long-term operation. Therefore, all departments need to check frequently to prevent process disorders caused by equipment aging. Fifth, choose appropriate additives to assist the flame retardant to be compatible with the matrix, improve the dispersion efficiency, and reduce the negative impact on the physical properties of products, especially plasticizers, coupling agents, etc. are commonly used.
Sixth, the processing environment must be properly dustproof and ventilated. Expanded graphite dust is light and fine, and it is easy to disperse and injure the operator's respiratory tract. It is appropriate to wear labor protective equipment to prevent direct contact with the skin after inhalation. Waste gas after processing should also be disposed of in accordance with environmental protection standards and should not be discharged arbitrarily to avoid damage to the environment.
In short, the application of expanded graphite flame retardants depends on the selection of excellent materials, suitable environment, intact equipment, rigorous craftsmanship, and strict adherence to safety regulations, in order to give full play to its strengths and ensure product quality.
