Download or read book GB T 22271 1 2021 Translated English of Chinese Standard GBT22271 1 2021 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2020-06-06 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document specifies a designation system for thermoplastic polyoxymethylene (POM) molding and extrusion materials. This designation system can serve as a basis for classification. Note: The polyoxymethylene material is a thermoplastic material, which is mainly composed of long chains of homopolymers and copolymers, as synthesized from formaldehyde. The repeating unit in the molecular chain is -CH2O-, which is an integral part of the main polymer chain as produced by the polymerization of formaldehyde.

Download or read book GB T 22271 2 2021 Translated English of Chinese Standard GBT22271 2 2021 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2020-06-06 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document specifies methods for the preparation of test specimens AND the determination of properties, for polyoxymethylene molding and extrusion materials. This document specifies the handling of the tested material, as well as the state conditioning requirements for the tested material prior to molding and the specimen prior to testing. This document specifies the methods and conditions for specimen preparation, as well as the method for measuring the specimen.