DS/ISO 7270:1988 PDF

Scope: This International Standard describes methods for the iden-tification of the polymer or the blend of polymers in raw rubbers and in vulcanized or unvulcanized compounds from the gas chromatographic patterns of their pyrolysis products (pyro-grams). Three methods are described, as follows: a) method A, which may be used for all rubbers to deter-mine the nature of the polymer or polymers present; the method will be easiest to apply in the case of single polymers; b) method B, which is particularly useful for determining the nature of the polymers present in blends, and is recom-mended for use when method A is not successful ; c) method C, which is used only if method A indicates the presence of styrene-butadiene copolymers or if method B indicates the presence of 2-vinylcyclohexene and styrene peaks in the pyrogram, and it is required to determine whether polybutadiene is present as well as styrene-butadiene copolymers. The use of the methods described in this International Standard presupposes sufficient working knowledge of the principles and techniques of gas chromatography to be able to carry out the operations described and to interpret the results correctly.

DS/ISO 7270:1988 history

1988 DS/ISO 7270:1988 Rubber. Identification of polymers (single polymers and blends). Pyrolytic gas chromatographic method