GB/T 21783-2008 (English Version) PDF

Standard No.: GB/T 21783-2008
Language: Chinese, Available in English version
Release Date: 2008
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 21783-2008

Scope: This standard specifies two methods for evaluating the melting behavior of partially crystalline polymers. The melting temperatures determined by different methods usually differ by a few degrees, as explained in the introduction. Method A: Capillary method This method is based on polymer deformation as a melting temperature measurement method, applicable to all partially crystalline polymers and their mixtures. Method B: Polarizing microscope method This method is based on the change of polymer optical properties to determine the melting temperature. It is suitable for the determination of the melting temperature of polymers containing birefringent crystal phases. It is not suitable for adding pigments that interfere with birefringence. and/or melting temperature determination of polymer crystalline regions of additives.

GB/T 21783-2008 Referenced Document

GB/T 2918 Standard environment for conditioning and testing of plastic specimens*， 2019-11-01 Update

2008 GB/T 21783-2008 Plasties.Determination of melting behaviour (melting temperature or melting range)of semi-crystalline polymers by capillary tube and polarizing-microscope methods