Technical datasheet

ST-FR309™

Supplied byCAI Performance Additives- Last Updated on Sep 2, 2025

ST-FR309™ by CAI Performance Additives is a halogen-free, environmentally friendly flame-retardant synergist masterbatch. It delivers exceptional fire protection to polyester-based materials without the use of antimony trioxide (ATO). It offers a reliable, efficient, and cleaner-performing alternative and is specifically designed for PET and PBT materials.
  • It utilizes a unique carbonization mechanism to enhance flame retardancy and suppress smoke effectively while minimizing environmental impact.
  • It integrates easily into polyester systems without affecting base properties.
  • It provides cost efficiency and achieves desired fire performance with fewer trade-offs and better material usage.
  • It has excellent thermal stability, low melt-drip risk and weather resistance.
  • ST-FR309™ achieves UL 94 V-0 at standard thicknesses.
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