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  • BSI
    BS 7164-7.1:1990, ISO 5945:1989 Chemical tests for raw and vulcanized rubber. Methods for determination of polymer content - Polyisoprene content
    Edition: 1990
    $266.02
    / user per year

Description of BS 7164-7.1:1990 1990

1.1 This International Standard specifies a method for the determination of polyisoprene occurring as natural isoprene rubber (NR)2), synthetic isoprene rubber (IR), balata and gutta percha, in the total solids from NR or IR latices, in solid raw rubbers, or in cured or uncured compounds.

The method is applicable to these isoprene rubbers alone or in blends. It cannot be used for hard rubber (ebonite) without modification.

1.2 Compounding ingredients, such as carbon black, mineral oil and sulfur, in soft rubbers do not interfere (see Table 1) (but see also 8.2). If vinyl acetate polymers are present, the method should not be used.

1.3 The method is applicable to blends of the rubbers mentioned in 1.1 with SBR, BR and NBR.

If halogenated rubbers are present, a slightly modified procedure, described in 7.7.3, is used. Some interference may be expected, because these rubbers react with chromic acid in a manner similar to polyisoprene. If these interfering rubbers are the major part of the blend, they may impede the reaction of the polyisoprene with the chromic acid. The digestion shall then be checked for completeness on known mixtures of these interfering rubbers.

Milling of the test portion as finely as possible is advisable.

1.4 The method may be used for the determination of polyisoprene in reclaimed rubbers, but it has been found to give consistently lower values than the previously accepted estimates for the polyisoprene content.

1.5 If rubbers other than those mentioned in 1.3 are present (CSM, EPDM, IIR, CIIR and BIIR), the digestion time shall be modified. The estimates shall be corrected by comparison with results from similar rubber blends. If these interfering rubbers are present in the blend, they may impede the reaction of the polyisoprene with the chromic acid and the method is not applicable. Greatest deviations are found if polysulfide rubbers are present as part of the mixture. (See Table 2.)



Method for natural or synthetic isoprene rubber, with some modification if halogenated rubbers are present. Not to be used if vinyl acetate polymers are present.

Standard NumberBS 7164-7.1:1990, ISO 5945:1989
TitleChemical tests for raw and vulcanized rubber. Methods for determination of polymer content - Polyisoprene content
StatusDefinitive
Publication Date1990-09-30
ReplacesBS 903:Parts B11 & B12:1960
Identical National Standard OfISO 5945:1989
DescriptorsNatural rubber, Isoprene rubber, Volumetric analysis, Specimen preparation, Polymers, Test equipment, Testing conditions, Synthetic rubber, Interferences (chemical), Isoprene, Oxidation methods, Distillation methods of analysis, Vulcanized materials, Determination of content, Vulcanized rubber, Latices, Chemical analysis and testing
ICS83.060 Rubber
CommitteePRI/22
ISBN0 580 18940 6
PublisherBSI
Pages12

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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