GB/T 15256-2014: Rubber or thermoplastic rubber, vulcanized -- Determination of low-temperature brittleness (multiple test piece method)

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Scope

This Standard specifies a method for determining the lowest temperature at which
rubber materials do not exhibit brittle failure or the temperature at which half of the test
pieces used in a test fail when impacted under specified conditions.
This standard applies to the determination of low temperature brittleness of vulcanized
rubber or thermoplastic rubber.
The temperatures thus determined do not necessarily relate to the lowest temperature at
which the material can be used since the brittleness will be affected by the conditions
of test and especially by the rate of impact. Data obtained by this method should,
therefore, be used to predict the behavior of rubbers at low temperatures only in
applications in which the conditions of deformation are similar to those specified in the
test.
Three procedures are described: procedure A, in which the brittleness temperature is
determined; procedure B, in which the brittleness temperature for 50% failure is
determined; procedure C, in which the test piece is impacted at a specified temperature.
Procedure C is used in the classification of rubber materials and for specification
purposes.
NOTE: A similar test for rubber-coated fabrics is described in ISO 4646, Rubber- or plastics-coated
fabrics - Low-temperature impact test.
punched from sheet using a suitable sharp die. Alternatively, type A test pieces can be
prepared using sharp, parallel double-bladed cutters, in a single stroke. The strip so
formed is then cut to the correct length.

Basic Data

Standard ID	GB/T 15256-2014 (GB/T15256-2014)
Description (Translated English)	Rubber or thermoplastic rubber, vulcanized -- Determination of low-temperature brittleness (multiple test piece method)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G40
Classification of International Standard	83.060
Word Count Estimation	16,169
Date of Issue	12/31/2014
Date of Implementation	7/1/2015
Older Standard (superseded by this standard)	GB/T 15256-1994
Quoted Standard	GB/T 25269-2010; ISO 23529
Adopted Standard	ISO 812-2011, IDT
Regulation (derived from)	National Standards Bulletin 2014 No. 33
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies the method for the determination does not appear when the rubber material is subjected to impact under specified conditions the minimum temperature of brittle failure brittle failure occurs or part of the sample temperature. This S