What is the difference between filament grade and bottle grade PET?

16 December 2019 1 3K Report

I want to use high viscosity polyester for making filament for special textile applications. Is it possible to get a high viscous PET chip for filament grade? I like to know what is the difference between filament grade PET and bottle grade PET.

Mina Karimi-Avargani

Dear Manas,

The main difference between fiber grade PET and bottle grade PET is their molecular weight, which Mw of bottle grade PET is more the other one.

For bottle grade PET: MW: 24000-36000 g/mol, intrinsic viscosity: 0.72-0.82 dL/g

For fiber grade PET: Mw: 15000-20000 g/mol, intrinsic viscosity: 0.55-0.67 dL/g

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