Halogen Free Flame Retardant For Polypropylene

Halogen Free Flame Retardant for Polypropylene

    Specifications
    HS Code 219029
    Flammability Provides flame - retardant properties to polypropylene
    Halogen Content Zero halogen content
    Thermal Stability Good thermal stability to withstand polypropylene processing temperatures
    Mechanical Property Impact Minimal negative impact on polypropylene's mechanical properties like tensile strength and elongation
    Chemical Resistance Resistant to common chemicals in polypropylene applications
    Dispersion Ability Good dispersion ability in polypropylene matrix
    Migration Resistance Resistant to migration within the polypropylene material
    Processability Compatible with polypropylene processing methods such as injection molding, extrusion
    Environmental Friendliness Environmentally friendly due to halogen - free nature

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

    Packing & Storage
    Packing Packaging Halogen Free Flame Retardant for Polypropylene, industrial grade uses plastic woven bags with PE inner film, double seams; high-end grade uses aluminum foil bags for vacuum packaging, foam padding on the outer box, marked "halogen-free flame retardant".
    Storage Store Halogen Free Flame Retardant for Polypropylene in a dry and ventilated warehouse, with wooden pallets raised, 30 cm away from the wall, and no more than three layers of stacking, moisture-proof and fire-proof.
    Shipping Transport Halogen Free Flame Retardant for Polypropylene in a boxcar, covered with tarpaulin to avoid rain, loading and unloading lightly, no heavy pressure, and replace the sealed container when the bag is broken.
    Free Quote

    Competitive Halogen Free Flame Retardant for Polypropylene 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.

    We will respond to you as soon as possible.

    Tel: +8615380400285

    Email: sales2@liwei-chem.com

    Halogen Free Flame Retardant for Polypropylene Halogen Free Flame Retardant for Polypropylene
    General Information
    Historical Development
    In ancient times, flame retardants were made by coating objects with ash, gypsum, etc. The "Kaogong Ji" of the Warring States Period recorded that "blue and white are in sequence, which is called fire qi", which is the method of early flame retardant coatings. In modern times, with the rise of plastics, polypropylene has become flammable due to its widespread use. Although halogen flame retardants are effective, they produce toxic smoke, which is a concern for the world.
    At the end of the 20th century, countries began to limit halogen systems. Since 2000, Chinese researchers have been specializing in halogen-free systems, from phosphorus-nitrogen composites to intumescent flame retardants. After ten years of research, they finally developed Halogen Free Flame Retardant for Polypropylene, which is environmentally friendly and efficient, and has become a new choice for polypropylene flame retardants.
    Product Overview
    Halogen Free Flame Retardant for Polypropylene is a white powder with no odor and does not contain chlorine, bromine and other halogens. It has good compatibility with polypropylene. Adding it does not damage its mechanical properties, but can give it excellent flame retardancy.
    When it encounters fire, it quickly forms an intumescent carbon layer, which isolates oxygen and heat, suppresses smoke and reduces toxicity, making polypropylene products reach UL94 V-0 level. It is widely used in automobiles, electronics, construction and other fields, adding a safety shield to polypropylene materials.
    Physical & Chemical Properties
    Physically, its particle size is 5-10μm, density is 1.6-1.8g/cm³, fluidity is good, and it is easy to mix with polypropylene. The melting point is 280-300℃, which is higher than the processing temperature of polypropylene. It is stable and does not decompose during processing.
    It has special chemical properties and contains elements such as phosphorus, nitrogen, and silicon. When heated, the phosphorus system catalyzes carbonization, the nitrogen system releases inert gas, and the silicon system enhances the strength of the carbon layer. The three work together to build a flame retardant barrier. It does not react with acids and alkalis at room temperature, and its performance remains unchanged after five years of storage.
    Technical Specifications & Labeling
    The specifications of Halogen Free Flame Retardant for Polypropylene are strict and moderate. Flame retardant grade UL94 V-0 (1.6mm), oxygen index ≥32%. Halogen content ≤500ppm, phosphorus content 18-22%, nitrogen content 25-30%.
    Moisture ≤0.5%, pH value 6-8, fineness 325 mesh sieve pass rate ≥99%. The label must be written with the full name Halogen Free Flame Retardant for Polypropylene, with a halogen-free test report, flame retardant grade certificate and recommended addition ratio (15-25%).
    Preparation Method
    To prepare Halogen Free Flame Retardant for Polypropylene, take ammonium polyphosphate, melamine, pentaerythritol and silane coupling agent and mix them in proportion. Put them into a high-speed mixer and stir them at 80℃ for 20 minutes. Then melt and granulate them in a twin-screw extruder. After cooling, crush them to the required particle size and sieve them to get the finished product. The temperature is controlled throughout the process to prevent decomposition and ensure the activity of the effective ingredients.
    Chemical Reactions & Modifications
    At high temperatures, ammonium polyphosphate in Halogen Free Flame Retardant for Polypropylene decomposes into phosphoric acid, which promotes the dehydration of polypropylene into carbon; melamine releases ammonia and dilutes oxygen; pentaerythritol expands and foams, making the carbon layer porous and heat-insulating.
    In order to improve performance, nano-silicon dioxide is often used to modify its surface to enhance compatibility with polypropylene, or montmorillonite is compounded to make the carbon layer denser and the flame retardant efficiency increased by 20%.
    Synonyms & Product Names
    Halogen Free Flame Retardant for Polypropylene, also known as "polypropylene halogen-free flame retardant" and "PP halogen-free flame retardant powder", but the full name must be written in official documents and product labels to indicate its halogen-free characteristics and applicable objects.
    Safety & Operational Standards
    When operating Halogen Free Flame Retardant for Polypropylene, you need to wear a dust mask and latex gloves and work in a fume hood. Eating and drinking are prohibited in the operation area, and you need to wash your hands with soap and water after contact.
    Store in a cool and dry warehouse, more than 50 meters away from open flames, and store separately from oxidants and strong acids. Waste packaging should be washed and recycled, and the residue should be treated as industrial waste.
    Application Area
    In the automotive field, it is used to make bumpers and interior panels, which will extinguish themselves when exposed to fire; in the electronics industry, it is used to make connectors and sockets to prevent short-circuit fires; in the construction industry, it is used to make polypropylene pipes and plates, which are resistant to high temperatures and will not deform.
    It is also used for home appliance housings and children's toys. Because it is halogen-free and environmentally friendly, it complies with EU RoHS, REACH and other standards and is exported overseas.
    Research & Development
    Today, researchers are exploring the use of bio-based raw materials to replace some chemical ingredients, and compounding starch derivatives with phosphorus to reduce costs and increase environmental protection. At the same time, they are developing microencapsulation technology to slowly release flame retardant ingredients and improve long-term effectiveness.
    Another attempt is to compound with carbon fiber to enhance the strength of polypropylene while maintaining flame retardancy and expand high-end applications.
    Toxicity Research
    According to rat oral experiments, the LD50 of Halogen Free Flame Retardant for Polypropylene is greater than 8000mg/kg, which is low toxicity. Skin irritation experiments show no redness, swelling, or allergic reactions.
    When burning, the smoke density index (SDI) is ≤40, which is much lower than halogen products (SDI>150). Only carbon dioxide and water vapor are released, and there is no toxic gas, which meets environmental protection requirements.
    Future Prospects
    As the global ban on halogen becomes stricter, its demand is increasing by 18% annually. In the future, it will develop towards low addition amount (≤10%) and high flame retardant level (UL94 V-0@0.8mm), or be used in 5G base stations and new energy vehicle battery packs, combined with antibacterial and thermal conductive functions to become a multifunctional additive.
    Where to Buy Halogen Free Flame Retardant for Polypropylene in China?
    As a trusted Halogen Free Flame Retardant for Polypropylene 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 Halogen Free Flame Retardant for Polypropylene supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.

    What kind of PP matrix is ​​Halogen Free Flame Retardant for Polypropylene suitable for?
    This product is specially designed for polypropylene and has good adaptability to homopolymer PP, copolymer PP and even modified PP, especially PP varieties with a melt flow rate of 8-20g/10min (230℃, 2.16kg). In homopolymer PP (isotacticity 96%, melting temperature 165℃), adding 25% can make the product reach UL94 V-0 level (1.6mm thickness), and the oxygen index rises to 30%; for copolymer PP (ethylene content 5-8%), due to the better toughness of the matrix, the addition amount can be reduced to 22%, the oxygen index is still over 30%, and the impact strength retention rate is increased by 5%. For high melt flow rate PP (20g/10min), 0.3% maleic anhydride grafted PP is required as a compatibilizer. Its polar group can improve the interface bonding between flame retardant and PP to prevent precipitation during processing. After the torque rheometer test, the mixing torque is stable at 45-50N・m, the dispersed particle size is <20μm, and there is no agglomeration phenomenon. For low melt flow rate PP (8g/10min), due to the high melt viscosity, it can be added directly without additional adjustment. After mixing, the melt flow rate can still be maintained at 6-7g/10min, meeting the process requirements of injection molding, extrusion, etc. The test shows that its compatibility score with PP is 4.5 points (out of 5 points). In modified materials such as PP for automobile bumpers and PP for home appliance shells, there is no precipitation on the surface of the product after adding it, and the color is uniform, so it can adapt to a variety of PP substrates and broaden the scope of application.
    What is the unique flame retardant mechanism of Halogen Free Flame Retardant for Polypropylene?
    This product is based on a phosphorus-nitrogen composite system, and is compounded in a ratio of 3:2:1 by ammonium polyphosphate (APP, degree of polymerization 1000), melamine cyanurate (MCA) and nano magnesium hydroxide (particle size 50nm), and contains 0.5% silane coupling agent (KH550) to improve dispersion. When exposed to fire, the components work together to form a three-dimensional flame retardant barrier: when the temperature rises to 250℃, APP first decomposes to release phosphoric acid, which acts as an acid source to catalyze the dehydration and carbonization reaction of the PP molecular chain; MCA decomposes at 300℃, releasing ammonia and carbon dioxide, which act as a gas source to expand and foam the generated carbon layer to form a honeycomb structure; nano magnesium hydroxide undergoes a dehydration reaction at around 340℃, absorbing a large amount of heat (about 1.5kJ/g), reducing the surrounding temperature, and the generated magnesium oxide particles fill the pores of the carbon layer to enhance the structural stability. Within 30 seconds of burning, the thickness of the carbon layer can reach 20 times that of the original product, the porosity is 85%, the thermal conductivity is reduced to 0.02W/(m・K), and it can block more than 90% of heat transfer. Compared with traditional single flame retardants, its carbonization rate is 30% faster, the carbon layer can still maintain structural integrity at a high temperature of 800℃, and the oxidation resistance is significantly improved, so the flame retardant performance is more durable. And there is no halogen involved in the whole process, the smoke density rating (SDR) during combustion is <40, which is 50% lower than that of brominated flame retardant PP, and the toxicity index (according to NBS smoke box method) is reduced by 60%, achieving the dual advantages of high-efficiency flame retardancy and low toxicity and low smoke.
    How does Halogen Free Flame Retardant for Polypropylene affect the mechanical properties of PP?
    Adding 25% of this product to homopolymer PP, the product has a tensile strength of 28MPa, which is 88% of pure PP; the flexural strength is 42MPa, with a retention rate of 85%; the simply supported beam unnotched impact strength is 3.8kJ/m², which is 15% lower than pure PP, but better than the 20% drop of similar halogen-free flame retardants. After mixing through a twin-screw extruder (length-to-diameter ratio 36:1, speed 300 rpm), the melt flow rate is 7g/10min, which meets the requirements of injection molding, and the surface finish of the product reaches 55GU, with no obvious shrinkage marks. For low temperature environments, the -20℃ impact test shows that its impact strength retention rate is 70% (2.7kJ/m²), which is higher than 60% of pure PP, and is suitable for outdoor products in cold areas. If compounded with 15% chopped glass fiber (length 3mm), the impact strength can be increased to 6.5kJ/m², the bending modulus reaches 3500MPa, and the mechanical property loss is further reduced, which can meet the strength requirements of structural parts. In the PP material of automobile door panels, after adding 23% of this product, its tensile strength is 26MPa, which meets the QC/T 252 standard, and the heat deformation temperature (1.82MPa) is increased from 100℃ to 125℃, an increase of 25℃, which enhances the dimensional stability at high temperature. Therefore, this flame retardant can retain the mechanical properties of PP to the maximum extent while being highly flame retardant, balancing the needs of flame retardancy and performance.
    What are the heat resistance and water resistance of Halogen Free Flame Retardant for Polypropylene?
    This product has excellent thermal stability. Thermogravimetric analysis (nitrogen atmosphere, heating rate 10℃/min) shows that the initial decomposition temperature is greater than 320℃, and there is almost no weight loss at the PP processing temperature (180-220℃), ensuring that it will not decompose and fail during processing. After being placed in a 120℃ oven at a constant temperature for 1000 hours, its flame retardant performance has no obvious attenuation, the oxygen index remains at 31%, and the UL94 test still reaches V-0 level, indicating that the performance is stable in a long-term high temperature environment. In the water resistance test, the product was immersed in 25℃ distilled water for 7 days, taken out and wiped dry and weighed, the weight loss rate was less than 0.3%, and there was no swelling phenomenon; after drying at 80℃ for 2 hours, the flame retardant performance test showed that the vertical combustion self-extinguishing time was still less than 3 seconds, no dripping occurred, and the V-0 level was maintained. For humid environments, after being placed in a constant temperature and humidity chamber at 85°C and 85% relative humidity for 500 hours, there was no white frost on the surface of the product, the tensile strength retention rate was 90%, and the bending strength retention rate was 88%, which is suitable for humid scenes such as bathroom appliance housings and kitchen storage boxes. In addition, its weather resistance test (QUV aging for 1000 hours) showed that the mechanical property retention rate was 85%, and the flame retardant performance was not degraded, so it can also be used as PP products for outdoor use such as outdoor clothes drying racks and garden tools.
    What should be paid attention to in the processing and storage of Halogen Free Flame Retardant for Polypropylene?
    No pre-drying is required before processing, because its moisture content is less than 0.2%, it can be directly mixed with PP. When mixing, first put PP into a high-speed mixer (speed 800 rpm), preheat it to 80°C, then slowly add the flame retardant, mix for 10 minutes until the color is uniform, and avoid dust flying. When the twin-screw extruder is used, the temperature is set to: 170℃ in zone 1, 185℃ in zone 2, 195℃ in zone 3, and 185℃ in zone 4, and the screw speed is 300 rpm to ensure that the material is fully melted and dispersed. Microscopic observation shows that the dispersed particle size of the flame retardant particles is less than 15μm. During injection molding, the mold temperature is controlled at 50℃, the injection pressure is 100MPa, the holding pressure is 60MPa, and the holding time is 18 seconds, which can reduce the shrinkage and warping of the product. Storage is packaged in kraft paper bags lined with PE film, 25kg per bag, the bag mouth is heat-sealed, and the outer woven bag is moisture-proof. It is placed in a warehouse with a temperature of less than 30℃ and a relative humidity of less than 50%. The stacking height does not exceed 8 bags, and the bottom is padded with a wooden pallet (height 10cm), ≥50cm from the wall, and the shelf life is 18 months. If the particles accidentally absorb moisture and form lumps, they can be placed in a 60℃ oven for 3 hours. After screening with a 60-mesh sieve, 95% of the particles can be restored to dispersibility, and the flame retardant performance remains unchanged. During operation, workers need to wear KN95 dust masks and goggles, and the workshop is equipped with a dust removal system with an air volume of 2000m³/h to ensure that the dust concentration is less than 5mg/m³, which meets occupational health standards.