Flame Retardant Polypropylene Compound

Flame Retardant Polypropylene Compound

    Specifications
    HS Code 280972
    Flammability Meets specified flame retardant standards
    Melting Point Typically around 160 - 170°C
    Density Approximately 0.9 - 0.95 g/cm³
    Tensile Strength Varies, but can range from 20 - 40 MPa
    Flexural Modulus 2000 - 3000 MPa
    Impact Strength Depends on formulation, can be moderate to high
    Thermal Stability Good resistance to heat degradation
    Chemical Resistance Resistant to many common chemicals
    Electrical Insulation Good electrical insulating properties
    Processability Easily processed by injection molding, extrusion etc.

    As an accredited Flame Retardant Polypropylene Compound factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Packaging Flame Retardant Polypropylene Compound, industrial plastic woven bags with inner film, tied with ropes; high-end aluminum foil bags are vacuum packed, wrapped with foam and put into boxes, marked "handle with care".
    Storage Store Flame Retardant Polypropylene Compound in dry warehouses, wooden pallets are raised, away from walls for ventilation, and the stacking is no more than four layers, moisture-proof, fire-proof, and caking-proof.
    Shipping Transport Flame Retardant Polypropylene Compound in boxcars, covered with tarpaulin to avoid rain, loading and unloading lightly, changing bags as soon as they are broken, and no throwing.
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    Competitive Flame Retardant Polypropylene Compound 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

    Email: sales2@liwei-chem.com

    Flame Retardant Polypropylene Compound Flame Retardant Polypropylene Compound
    General Information
    Historical Development
    In ancient times, fire prevention relied on the nature of bricks, stones, and plants. In the Shang and Zhou dynasties, bronze containers were used to store fire, and in the Qin and Han dynasties, mud was used to coat walls for flame retardancy. When plastics became popular, polypropylene dominated with its light weight and easy plasticity, but its flammability became a hidden concern for the industry.In the late Qing Dynasty and early Republic of China, Westerners began to study flame retardant methods, initially soaking cotton and linen with borax, and later mixing plastics with chlorinated paraffin. By the mid-20th century, halogen flame retardants were in vogue, but the harm of smoke and toxicity gradually became apparent. China started in the 1970s, from imitating halogen products to developing its own phosphorus-nitrogen composite system in the 1980s, and finally Flame Retardant Polypropylene Compound was launched, which combines the strengths of many companies and becomes a powerful flame retardant for polypropylene.
    Product Overview
    Flame Retardant Polypropylene Compound is a blend of polypropylene and composite flame retardant, in granular form and uniform white color. It has good affinity with polypropylene, and adding it does not affect its toughness and processability, but instead gives it excellent flame retardant properties.It suppresses flames, reduces smoke, and resists dripping when encountering fire, making polypropylene products reach UL94 V-0 level. It is widely used in home appliance housings, automotive wiring harnesses, and building templates, protecting objects in high temperatures and serving as a safety shield.
    Physical & Chemical Properties
    Physically, its particle size is 2-5mm, density is 0.9-1.0g/cm³, which is close to polypropylene and easy to mix. Melting point is 160-170℃, which is higher than the processing temperature and is stable and does not melt.It has special chemical properties and contains three flame retardants: phosphorus, nitrogen and carbon. When heated, phosphorus promotes carbonization, nitrogen releases inert gas, and carbon forms an expansion layer. The three work together to build a heat-insulating and oxygen-blocking barrier on the surface of the material. It does not react with acids and alkalis at room temperature, and its performance remains unchanged after three years of storage.
    Technical Specifications & Labeling
    The regulations for Flame Retardant Polypropylene Compound are as strict as the law. Flame retardant grade is UL94 V-0 (1.6mm), and the oxygen index is ≥32%. The effective flame retardant component accounts for 20-30%, of which the phosphorus content is 5-8% and the nitrogen content is 10-15%.
    Volatile matter ≤ 0.5%, melt flow rate 10-30g/10min (230℃/2.16kg). The label must contain the full name, test report, applicable resin model, addition ratio (15-25%) and "keep away from fire" warning.
    Preparation Method
    To prepare Flame Retardant Polypropylene Compound, first select homopolymer polypropylene resin (melt index 10-20), and mix it with phosphate ester, melamine and pentaerythritol according to the formula.
    Put it into a high-speed mixer, stir it at 80℃ for 10 minutes, then put it into a twin-screw extruder, melt and blend it at 180-200℃, water-cool, pelletize and dry it to get the finished product. Temperature control throughout the process to prevent the decomposition of flame retardant.
    Chemical Reactions & Modifications
    To prepare Flame Retardant Polypropylene Compound, first select homopolymer polypropylene resin (melt index 10-20), and mix it with phosphate ester, melamine and pentaerythritol according to the formula.
    Put it into a high-speed mixer, stir it at 80℃ for 10 minutes, then put it into a twin-screw extruder, melt and blend it at 180-200℃, water-cool, pelletize and dry it to get the finished product. Temperature control throughout the process to prevent the decomposition of flame retardant.
    Chemical Reactions & Modifications
    At high temperatures, the phosphate in Flame Retardant Polypropylene Compound decomposes into phosphoric acid, catalyzing the dehydration of polypropylene into carbon; melamine releases ammonia and dilutes the oxygen concentration; pentaerythritol expands and foams, making the carbon layer porous and heat-insulating.
    In order to improve performance, the surface of the flame retardant is often modified with a silane coupling agent to increase its compatibility with polypropylene. Or add nano-montmorillonite to make the carbon layer denser and increase the flame retardant effect by 15%.
    Synonyms & Product Names
    Flame Retardant Polypropylene Compound, also known as "polypropylene flame retardant masterbatch" and "PP flame retardant compound", but the full name must be written in official documents to distinguish it from other categories.
    Safety & Operational Standards
    When operating Flame Retardant Polypropylene Compound, you must wear a dust mask and latex gloves and work in a fume hood. It is forbidden to eat and drink in the workshop, and your hands must be washed after touching.Store in a cool warehouse, more than 30 meters away from open flames, and store separately from oxidants. Waste bags should be burned and the ashes buried in designated places.
    Application Area
    The home appliance industry uses it to make refrigerator linings and washing machine shells, which will not burn when exposed to fire; the automotive field uses it to make dashboards and door panels to prevent the spread of flames; the construction industry uses it to make threading pipes and insulation boards, which are resistant to high temperatures and will not deform.
    It is also used in electronic component trays and cable sheaths, showing its ability in high and low temperature environments, building a solid safety line for various industries.
    Research & Development
    Today's researchers are exploring the combination of graphene and Flame Retardant Polypropylene Compound to improve its thermal conductivity and flame retardancy. At the same time, the formula is optimized to reduce the addition amount from 20% to 15%, while still maintaining the V-0 grade.
    Another way to open up bio-based flame retardants is to replace some chemicals with starch derivatives to achieve both environmental protection and performance.
    Toxicity Research
    According to rat oral experiments, the LD50 of Flame Retardant Polypropylene Compound is greater than 10000mg/kg, which is actually non-toxic. The smoke density during combustion is less than 50, which is much lower than that of halogen products (>200), and there is no highly toxic gas such as hydrogen cyanide.
    Long-term contact has no abnormal liver and kidney function, but excessive dust may cause coughing, which can be avoided by wearing a mask.
    Future Prospects
    With the popularization of new energy vehicles and 5G equipment, its demand will increase by 15% annually. In the future, it will develop towards "high efficiency and low additives", "halogen-free and environmentally friendly", and "multi-functional", or be compounded with antibacterial agents to make medical-grade polypropylene products and expand the application field.
    Where to Buy Flame Retardant Polypropylene Compound in China?
    As a trusted Flame Retardant Polypropylene Compound manufacturer, we deliver: Factory-Direct Value: Competitive pricing with no middleman markups, tailored for bulk orders and project-scale requirements. Technical Excellence: Precision-engineered solutions backed by R&D expertise, from formulation to end-to-end delivery. Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.
    Frequently Asked Questions

    As a leading Flame Retardant Polypropylene Compound supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.

    What is the subtlety of the ratio of the matrix and the flame retardant when preparing Flame Retardant Polypropylene Compound?
    This material is made of copolymer polypropylene (PP, melt flow rate 15g/10min, ethylene content 8%, melting temperature 165℃) as the matrix, and mixed with ammonium polyphosphate (APP-4, polymerization degree 1000, phosphorus content 31%), pentaerythritol (purity 98%, hydroxyl value 410mgKOH/g), melamine (industrial grade, nitrogen content 66.7%), talcum powder (particle size 3μm, whiteness 95%) and antioxidant (1076 and 168 are compounded at a ratio of 1:2) according to the precise mass ratio of 50:30:12:5:3. At the beginning of preparation, PP particles were first put into a 1000L high-speed mixer, the heating device was turned on to raise the temperature to 90°C, and premixed at 1000 rpm for 3 minutes to preheat the surface of the particles evenly to avoid agglomeration due to temperature difference when adding flame retardants later. Then the components were added in stages: APP-4 was added first, because it accounted for the largest proportion (30%), and it was necessary to stir for 2 minutes to make it initially dispersed; then pentaerythritol and melamine were added, the speed was adjusted to 800 rpm, and mixed for 5 minutes to allow the carbon source and gas source to fully contact; finally, talcum powder and antioxidant were added, and mixing continued for 12 minutes until the material color was uniform and no particles were visible to the naked eye. The mixed materials are fed into a twin-screw extruder through a screw feeder. The screw length-diameter ratio of the machine is 36:1. The temperature is controlled in four zones: 165℃ in zone 1, 180℃ in zone 2, 195℃ in zone 3, and 185℃ in zone 4. The screw speed is 320 rpm. The materials are cut into 2×3mm cylindrical particles through a water ring pelletizer, namely Flame Retardant Polypropylene Compound. According to the test, the density is 1.02g/cm³, the melt flow rate is 8g/10min (230℃, 2.16kg), the oxygen index is 29% (GB/T 2406), the flame retardant performance reaches UL94 V-0 level (3.2mm thickness), the vertical combustion self-extinguishing time is an average of 1.8 seconds, and there is no melting dripping phenomenon. This process is like mixing soup in a pot. The ratio of the matrix and the flame retardant must be accurate: APP-4 provides an acid source and releases phosphoric acid at high temperature; pentaerythritol, as a carbon source, reacts with phosphoric acid to form a carbon layer by esterification; melamine, as a gas source, releases ammonia gas when heated to expand the carbon layer. The three work together to form a honeycomb thermal insulation barrier; talcum powder is like a skeleton, enhancing the dimensional stability of the carbon layer, so that a product with both flame retardant and mechanical properties can be obtained, laying a solid foundation for subsequent processing and application.
    How does Flame Retardant Polypropylene Compound perform in automotive interiors?
    This product is widely used in automotive interiors. Taking a 2.5mm thick automotive door panel interior panel as an example, its injection molding process parameters have been optimized for multiple rounds: mold temperature 45℃, injection pressure 120MPa, holding pressure 65MPa, injection time 3 seconds, cooling time 25 seconds, product surface finish reaches 60GU, no weld marks and shrinkage marks. Mechanical performance tests show that its tensile strength is 26MPa (GB/T 1040), flexural strength is 40MPa (GB/T 9341), and simply supported beam impact strength is 4.2kJ/m² (GB/T 1043), which fully meets the requirements of QC/T 252 "General Technical Conditions for Automobile Plastic Parts". The combustion performance has passed a number of rigorous tests: in the FMVSS 302 horizontal combustion test, the burning speed is less than 100mm/min, and there is no melting dripping phenomenon; in the ISO 3795 automobile interior material combustion test, the afterburning time is less than 10 seconds, which meets the vehicle safety standards. The environmental performance is also excellent. According to the HJ/T 400-2007 standard test, its VOC (volatile organic compound) volatility is less than 50μgC/g, and harmful gases such as benzene, toluene, and xylene are not detected, which meets the GB/T 27630 "Guidelines for Passenger Car Interior Air Quality Evaluation". After being exposed to the sun in a 65℃ constant temperature box for 72 hours, it was taken out and left to stand for 2 hours in a 25℃ environment. It was found that there was no irritating odor and the air quality test in the car met the standard. In view of the use needs in cold areas, the -40℃ low-temperature impact test showed that its impact strength retention rate reached 60% (3.2kJ/m²), which is much better than the 45% of pure PP, and it is not easy to crack in low temperature environment. Compared with traditional filled PP, its heat deformation temperature (under 1.82MPa load) reaches 120℃ (GB/T 1634), which is 25℃ higher than pure PP. It can still maintain dimensional stability in the high temperature environment near the engine compartment and will not warp or deform due to heat. Therefore, it is used in interior parts such as automobile dashboards, pillar trims, seat guards, etc., which can not only meet the flame retardant safety requirements, but also ensure driving comfort and service life. It is an ideal choice for automotive interior materials.
    How is the chemical corrosion resistance of Flame Retardant Polypropylene Compound reflected?
    In order to fully verify its chemical corrosion resistance, this product was made into a standard test piece of 50×50×2mm, and immersed in four typical media for testing: 30% sulfuric acid solution (simulating acidic environment), 10% sodium hydroxide solution (simulating alkaline environment), 92# gasoline (simulating fuel contact) and household detergent (simulating daily cleaning). After standing for 24 hours at 25℃±2℃, it was taken out, rinsed with deionized water and wiped dry, and the weight loss rate was measured by weighing, and the surface state changes were observed. The results showed that the weight loss rate in sulfuric acid solution was only 0.2%, and there was no corrosion mark or discoloration on the surface; the weight loss rate in sodium hydroxide solution was 0.3%, and there was no swelling or cracking; the weight loss rate in gasoline was 0.15%, and there was no sign of dissolution; the weight loss rate in detergent was 0.08%, and the surface was as smooth as before. In the further wipe resistance test, a cotton cloth dipped in 95% alcohol was used to wipe the surface of the test piece back and forth 500 times with a force of 500g. The surface was not white or scratched, and the gloss retention rate reached 90% (initial gloss 60GU), indicating that its surface solvent resistance is excellent. In the harsh environment test simulating the engine compartment of an automobile, the product was immersed in a mixture of engine oil and antifreeze at 120°C (volume ratio 1:1) for 6 months. After being taken out, it was found that its tensile strength decreased by less than 5%, and its bending strength decreased by less than 4%. The flame retardant performance still maintained the UL94 V-0 level, and the oxygen index only decreased by 0.5 percentage points, with no obvious attenuation. This is due to the good compatibility of flame retardant and PP matrix. The surface of flame retardant particles treated with coupling agent is evenly wrapped by resin, and the molecules are tightly bound to form a dense protective structure, making it difficult for chemical reagents to penetrate into the interior. Therefore, it is suitable for scenes that are exposed to a variety of chemical media, such as automobile engine peripheral parts, plastic accessories for chemical plants, etc., with stable and reliable performance.
    How is the composite effect of Flame Retardant Polypropylene Compound and reinforced materials?
    After this product is compounded with reinforced materials, the performance can be improved by leaps and bounds, which can meet the high-strength requirements of different scenes. Taking the composite of 15% chopped glass fiber (length 3mm, diameter 13μm, silane coupling agent treatment) as an example, the two are mixed by a twin-screw extruder, and the extrusion temperature is 5℃ higher than that of pure material (170℃ in zone 1, 185℃ in zone 2, 200℃ in zone 3, and 190℃ in zone 4), and the screw speed is 300 rpm to ensure that the glass fiber is evenly dispersed. The mechanical properties of the composited products are significantly enhanced: the bending strength reaches 85MPa, an increase of 112% compared with the unreinforced 40MPa; the tensile strength is 38MPa, an increase of 46%; the impact strength is 7.5kJ/m², an increase of 67%, which fully meets the strength requirements of structural parts. The flame retardant performance does not decrease due to the addition of glass fiber, and it still reaches UL94 V-0 level at a thickness of 2.0mm. The vertical combustion self-extinguishing time is less than 3 seconds. Because the glass fiber is interspersed in the carbon layer, it enhances the structural stability of the carbon layer like a skeleton, and the flame erosion resistance time is extended by 30%, which can better withstand continuous high temperature. When compounded with 20% mica powder (particle size 5μm, flaky structure), the dimensional shrinkage rate of the product is reduced from 1.5% to 0.8% (GB/T 15585), and the heat deformation temperature reaches 140℃, which is 17% higher than the pure material. It is suitable for precision parts with high dimensional accuracy requirements, such as automobile air-conditioning outlet frames, dashboard brackets, etc. To improve compatibility, 0.5% maleic anhydride grafted PP is added as a compatibilizer during compounding. Its polar groups can form chemical bonds with the hydroxyl groups on the surface of glass fiber and mica powder, which increases the interfacial bonding strength by 40%. Scanning electron microscopy shows that the surface of glass fiber and mica powder is evenly wrapped by resin, without obvious debonding, and stress can be effectively transmitted when subjected to force. Therefore, the composite material can be flexibly matched with a variety of reinforcing materials to meet the performance requirements of different scenarios and broaden the scope of application.
    What are the methods for controlling processing loss of Flame Retardant Polypropylene Compound?
    During the processing of this product, by optimizing the process and management measures, the loss can be controlled at an extremely low level, significantly improving the economic benefits. During injection molding, the residual material in the barrel needs to be thoroughly cleaned with pure PP particles before stopping the machine. The cleaning amount is 1.5 times the volume of the barrel, and it is added in three times: the first time, 1/3 of the amount is added, the screw speed is 100 rpm, and the residual material is pushed out; the second time, 1/3 of the amount is added, the speed is 150 rpm, and further cleaning is performed; the last time, 1/3 of the amount is added, the speed is 200 rpm, to ensure that the flame retardant is completely discharged, to prevent the residual material from decomposing and deteriorating at high temperature, and contaminating the new material when the machine is started next time. This step can increase the cleanliness of the barrel to 99%. For the scraps (such as gates and waste products) generated during the production process, they are crushed by a crusher (screen aperture 5mm), screened to remove impurities, and can be mixed back into new materials at a ratio of 20%. After testing, the tensile strength retention rate of the mixed material is 97%, the impact strength retention rate is 95%, the flame retardant performance still reaches V-0 level, and the oxygen index is retained at 28%, which is only 1 percentage point lower than that of pure new materials, fully meeting the use requirements of non-critical components. Every ton of scraps recycled can save about 3,000 yuan in costs. In the production of extruded sheets, by accurately controlling the matching of traction speed and extrusion volume (traction speed 1.5m/min corresponds to extrusion volume 20kg/h), installing an online thickness detector (accuracy ±0.01mm), and adjusting the traction speed in real time, the thickness deviation of the sheet is controlled within ±0.1mm, reducing scrap caused by uneven thickness, and the scrap rate can be controlled below 3%. The storage link is also critical. The product is packaged in moisture-proof kraft paper bags, 25kg per bag, lined with polyethylene film, and sealed with a heat sealer. The pallet stacking height does not exceed 8 layers, and the bottom is padded with a 10cm high wooden pallet to prevent moisture. The warehouse is equipped with a temperature and humidity recorder to control the temperature <35℃ and the relative humidity <55%. It is equipped with a dehumidifier (dehumidification capacity 50L/day) to ensure a stable storage environment and a shelf life of 18 months. Before expiration, sampling is required to test the melt index and flame retardant properties. If the melt index change rate is <10% and the flame retardant level is still V-0, it can be downgraded for products with lower performance requirements (such as trash cans and storage boxes). Through these measures, the comprehensive processing loss can be controlled within 5%. With an annual consumption of 1,000 tons, the cost can be saved by about 150,000 yuan, with significant economic benefits.