Composite Flame Retardant for PU

Polyurethane (PU) is a versatile material with enormous industrial potential. However, it is inherently flammable and will burn when exposed to fire. Once on fire, the combustion process will be very rapid, which generates a large amount of toxic fumes and gases, resulting in serious casualties and property damage. Therefore, it is crucial to improve the fire retardancy of PU materials to broaden their practical applications.

Composite Flame Retardant for PU

Alfa Chemistry offers composite flame retardant for PU, which belongs to the nitrogen-phosphorus composite system. After adding this product, the PU coating will foam and expand to form a porous carbon layer on the surface of the coating when it is thermally cracked or burned, which can play the role of heat insulation, oxygen insulation, flame retardant and prevent the production of molten droplets. When decomposing, the flame retardant can also produce a large number of non-combustible gases to dilute the oxygen concentration around the combustible material, which plays a good synergistic effect with the carbon layer formed during combustion to achieve the flame retardant effect.


AppearanceWhite Powder
Phosphorus (P) Content≥ 10%
Nitrogen (N) Content≥ 25%
Moisture Content≤ 0.3%
Relative Density1.6-1.9 g/cm3
Bulk Density0.56 g/cm3
Particle Size6-20 μm D50

Usage and Dosage

  • These composite flame retardants are mainly used for PU and PU-based textile coatings, and it is recommended to add about 20% to 25% in actual use.
  • The products are susceptible to moisture and should be placed in a cool, dry place.
  • If the packages are found to be broken or damp, dry at 100 ℃±10 ℃ for 2 hours before use.

Choose Alfa Chemistry

Alfa Chemistry is one of the leading suppliers of flame retardants worldwide, specializing in the development, production and sales of innovative and highly effective flame-retardant products. Our team consists of technical experts with specialized knowledge and research capabilities, capable of providing you with professional flame-retardant products and solutions. If you have any requirements, please do not hesitate to contact us.

※ Please kindly note that our products and services are for research use only.