ASTM D 3452 - 06 (Reapproved 2017) Standard Practice for Rubber - Identification by Pyrolysis-Gas Chromatography

Current edition approved May 1, 2017. Published May 2017. Originally approved in 1975. Last previous edition approved in 2012 as D3452 – 06 (2012). — 5 p.
This practice covers the identification of polymers in raw rubbers, and cured and uncured compounds, based on a single polymer, by the gas chromatographic patterns of their pyrolysis products (pyrograms). Implementation of this guide presupposes a working knowledge of the principles and techniques of gas chromatography, sufficient to carry out this practice and to interpret the results correctly.2
This practice will identify the following polymers:
Polyisoprene of natural or synthetic origin,
Butadiene-styrene copolymers,
Polybutadiene,
Polychloroprene,
Butadiene-acrylonitrile copolymers,
Ethylene-propylene copolymers and related terpolymers, and Isobutene-isoprene copolymers.
This practice will not differentiate the following polymers:
Natural polyisoprene from synthetic polyisoprene.
Butadiene-styrene copolymers produced by solution and emulsion polymerization. It is sometimes possible to distinguish butadiene-styrene copolymers containing differentamounts of styrene as well as random polymers from block polymers.
Polybutadiene with different microstructures.
Different types of polychloroprenes.
Butadiene-acrylonitrile copolymers with different monomer ratios.
Ethylene-propylene copolymers with different monomer ratios, as well as the copolymers from the related terpolymers.
Isobutene-isoprene copolymers (butyl rubbers) from halogenated butyl rubbers.
Polyisoprene containing different amounts of cis-trans isomers.
The practice does not identify ebonite or hard rubbers.