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ISO 3146:2022

Plastics - Determination of melting behaviour (melting temperature or melting range) of semi-crystalline polymers by capillary tube and polarizing-microscope methods

This document specifies two methods for evaluating the melting behaviour of semi-crystalline polymers.

 

a) Method A: Capillary tube

 

This method is based on the changes in shape of the polymer. It is applicable to all semi-crystalline polymers and their compounds.

 

NOTE 1   Method A can also be useful for the evaluation of the softening of non-crystalline solids.

 

b) Method B: Polarizing microscope

 

This method is based on changes in the optical properties of the polymer. It is applicable to polymers containing a birefringent crystalline phase. It might not be suitable for plastics compounds containing pigments and/or other additives which can interfere with the birefringence of the polymeric crystalline zone.

 

NOTE 2   Another method applicable to semi-crystalline polymers is described in ISO 11357 3.

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International Organization for Standardization [iso]

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