CAI Performance Additives introduces antimony-free flame retardant for polyester applications
Last update on Sep 2, 2025
CAI Performance Additives, provider of innovative additive solutions, announced the launch of ST-FR309™, a high-performance, eco-friendly flame retardant masterbatch that delivers exceptional fire protection to polyester-based materials without the use of antimony trioxide (ATO).
Utilizes unique carbonization mechanism for fire protection
As industries face increasing regulatory and environmental pressure to move away from antimony-based additives, ST-FR309™ offers a reliable, efficient, and cleaner-performing alternative.
Specifically designed for PET and PBT materials, this white powder masterbatch utilizes a unique carbonization mechanism to enhance flame retardancy while minimizing environmental impact.
Key Benefits of ST-FR309:
- 100% Antimony-free: Fully replaces antimony trioxide in PET and PBT applications.
- Strong flame retardancy: Forms a stable carbonized layer in polyester to suppress flame spread and smoke effectively.
- Superior compatibility: Integrates easily into polyester systems without affecting base properties.
- Outstanding thermal stability: With a decomposition temperature above 350°C and low melt-drip risk, it performs reliably under processing conditions.
Environmental and cost efficiency: Achieves desired fire performance with fewer trade-offs and better material usage.
“This is not just a replacement; it’s a performance upgrade,” said Torey McCleskey, COO of CAI Performance Additives. “ST-FR309™ enables manufacturers to eliminate ATO in their polyester systems, simplifying compliance and enhancing sustainability.”