Overview
Applications
Comparison
Chemical formula
Specific gravity
1.38
Thermal properties
70
Tg(℃)
260
Tm(℃)
Characteristics
Heat resistance
Electrical insulation
Chemical resistance
Flammable
No dimensional stability
Low temperature resistance
Difficult to injection mold
Commentary
A polycondensation product of terephthalic acid and ethylene glycol. It is a crystalline resin. When the crystallinity is low, it is transparent and low heat resistance. When the crystallinity is high, it is opaque and high heat resistance.
・C-PET (crystalline PET): Slowly cooled, opaque and high heat resistant (about 220℃)
・A-PET (amorphous PET): Rapidly cooled, transparent and low heat resistant (about 60℃)
・G-PET (amorphous PET): Ethylene glycol partially replaced with cyclohexanedimethanol, inhibiting crystallization
・GF-PET is a glass fiber reinforced injection molding material of PET
Key points
- As it is, it has not high impact strength, but when it is made into thread or film and stretched, its strength increases.
- Polyester thread made from PET is a very strong fiber that is soft to the touch, dries quickly, and has excellent wrinkle resistance, abrasion resistance, and dyeability. Therefore, it is the most widely used synthetic fiber.
- Natural materials are suitable for extrusion, spinning, and blow molding, but not for injection molding.
Egg cartons
Reason for adoption
Made from recycled materials from used PET bottles (recyclability, high tensile strength, transparency)
Clothes (polyester fiber)
Reason for adoption
Easy to make threads, easy to color (spinnability, dyeability)
PET bottles
Reason for adoption
Good at blow molding process, hot filling is possible by crystallizing (heat resistance), transparency
Crystalline
Polyethylene
Polypropylene
Polyethylene
Terephthalate
Polyoxymetylene /
Polyacetal
Polybutylene
Terephthalate
Polyamide 6 /
Polyamide 66
Syndiotactic
Polystyrene
Poly Phenylene Sulfide
Polyphthalamide
Liquid Crystal Polymer
Fluorocarbon Polymers
Polyether-etherketone
Polymethyl-pentene
