PBT has an oxygen index of only 20–22, classifying it as a flammable material. During combustion, it tends to produce molten drips. To meet the stringent flame-retardancy requirements (such as UL94 V-0) in fields like electronic connectors and switch components, flame-retardant modification is essential.
Formulation Example (by Weight %):
PBT Resin: 80–90%
Primary Flame Retardant (e.g., Decabromodiphenyl Ethane): 8–12%
Synergist (Antimony Trioxide): 1–3%
Anti-dripping Agent (e.g., K-PT201): 0.2–0.5%
Glass Fiber: 0–30%
The above formulation system utilizes "bromine-antimony-silicon" synergy, enabling it to meet UL94 V-0 while maintaining PBT's excellent mechanical, electrical, and processing properties. For halogen-free or higher heat resistance applications, this can be achieved by substituting the primary flame retardant and optimizing the synergistic system.
Note: The actual formulation should be adjusted based on specific application requirements, regulatory restrictions, and processing conditions. Small-scale sample testing and evaluation are strongly recommended.
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