Key principles.
Fast
Crystallizes in mold rapidly. Short cycles. Engineering use.
Slow
Slower crystallization. Stretched-blow process for bottles.
Stiffer
Higher modulus, dimensional stability, electrical-grade.
Transparent
Amorphous PET clear. Used for bottles, packaging, films.
HDT 60°C
Lower heat resistance unfilled. Glass-filled HDT 200°C.
HDT 70°C
Slightly higher unfilled. Used in oven-safe containers.
FAQ
PBT — molds 10× faster than PET. Used for injection-molded parts.
PET — amorphous PET water-clear. Used for transparent bottles.
Both available glass-filled. PBT 30% glass standard. PBT-GF more common in engineering.
PET #1, PBT #7 (other). PET large recycling stream from bottles. PBT minimal recycling.
Similar — PBT slightly higher due to engineering applications. ~$3-4/kg both.
PBT for engineering parts (electrical, automotive). PET for transparent containers, films, fibers.
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