Gummi

This document specifies a test based on hardness measurements for determining the progressive stiffening of rubber with time, caused by crystallization. It is limited to materials having an initial hardness at a test temperature of from 10 IRHD to 85 IRHD.

The method is applicable to raw, unvulcanized (compounded) and vulcanized rubber. It is mainly of interest for rubber with a marked crystallization tendency at temperatures experienced in cold climates, such as chloroprene and natural rubber.

The method is not applicable to fast-crystallizing materials which crystallize to a considerable degree within the time-span of 15 min used for conditioning at test temperature.

This document specifies methods for the determination of chlorine and/or bromine present in raw rubber as well as vulcanized or unvulcanized rubber compounds.

The methods are applicable to natural rubbers and to the following synthetic rubbers: isoprene, styrene-butadiene, butadiene, butyl, halogenated butyl, nitrile, ethylene-propylene, chloroprene and epichlorohydrin.

The vocabulary is limited to those terms in general use throughout the rubber industry.

It does not define terms intended for particular rubber products, some of which are given in the vocabulary standards listed in the Bibliography.

It does not define terms that are generally understood or adequately defined in other readily available sources such as general dictionaries.

The terms are listed in the alphabetical order of the English terms, with a French index to the corresponding English terms attached. Some terms have parenthetical information added to indicate a specific limitation of the term to a particular field, for example “〈ubber latex〉”. When a term has one or more synonyms, the synonymous terms follow the preferred term.

Deprecated terms are indicated by “DEPRECATED”.

Symbols are included under their full descriptions, but for convenience they are also listed separately at the end of the main text.

For convenience, standards and other relevant sources referred to in this vocabulary are listed in the first section of the Bibliography and vocabularies relating to finished rubber products are listed in the second section.