Antimony trioxide (Sb2O3, ATO) is widely used as a flame retardantin combination with halogenated materials. The combination of the halides and the antimony is the key to the flame-retardant action for polymers, helping to form less flammable chars. The Objective of this work is to develop ATO free FR PBT products with equal robust FR properties. Many candidates were screened to replace ATO as the flame retardant synergist. Among them all, one FR combination package with no ATO was tried in a glass filled PBT system. Experimental results demonstrated that this ATO free FR PBT product shows good flame properties and passes UL 94 VO rating @ 0.71 mm thickness. Meanwhile, the physical properties, mechanical properties, and processability were all well maintained. In addition, the ATO free FR PBT formulation is very robust against both extreme extrusion conditions and abusive molding conditions even when recycle materials are incorporated. The same ATO free FR package has the potential to work in other unfilled and filled PBT resins or blends too.
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