Composite Flame Retardant for PBT

Polybutylene terephthalate (PBT) is a crystalline thermoplastic engineering plastic with excellent comprehensive performance, widely used in automotive, electrical and electronic appliances, machinery and other fields. However, due to the poor flame retardant properties of PBT, it is easy to burn in the air and cause danger. Hence, the flame retardant modification of PBT has been a hot topic in the field of engineering plastics.

Composite Flame Retardant for PBT

Alfa Chemistry offers composite flame retardant for PBT, specialized in flame retardancy of PBT with fiber reinforcement, which fully meet the requirements of customers in the electronics and electrical industries. Our product is environmentally friendly and halogen free, fully compliant with the European Union's RoHS Directive and REACH regulation.

composite flame retardant for PBT


AppearanceWhite Powder
Whiteness≥ 95
Phosphorus (P) Content≥ 16%
Nitrogen (N) Content≥ 24%
Moisture Content≤ 0.1%
Decomposition Temperature≥ 290 ℃



Our composite flame retardant for PBT mainly has the following advantages:

  • It has high flame retardant efficiency with small additive quantities.
  • It has good compatibility with polymers and does not migrate or precipitate in the material.
  • It is thermally stable, easy to process and has excellent water resistance.

Usage and Dosage

1. Adding 15-18% of this product to PBT containing 30% glass fiber (GF) can pass the UL 94 V-0 (1.6mm) rating flame retardant test. Moreover, some of the properties of this product are better than those of antimony & bromide flame-retardant system.

2. Processing temperature should be controlled below 260 ℃, and contact with strong oxidizing substances should be avoided to prevent the color change of the final product.

Choose Alfa Chemistry

Alfa Chemistry has long been committed to the research and development of flame retardants, as well as the exploration and promotion of their applications. Our advanced testing methods and strict quality control system make our products stable and reliable. At the same time, we provide targeted formulations and optimized flame retardant solutions according to the different needs of our customers. For more information, please feel free to contact us.

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