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GB/T 25260.2-2018Synthetic rubber latex—Part 2: Carboxyl acrylonitrile-butadiene rubber latex (XNBRL) (English PDF)

合成胶乳第2部分：羧基丁腈胶乳（XNBRL）

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 28, 2018

Implementation date

November 1, 2019

Scope

GB/T 25260.2-2018 is the English-translated version of 合成胶乳第2部分：羧基丁腈胶乳（XNBRL）.

GB/T 25260.2-2018 is Part 2 of the Chinese national standard on synthetic rubber latex and covers carboxylated acrylonitrile-butadiene rubber latex (XNBRL), made by emulsion polymerisation of butadiene, acrylonitrile and an unsaturated carboxylic acid.

It sets the technical requirements, test methods, inspection rules, marking and accompanying documents, and packaging, transport and storage.

The latex must be a white emulsion free of foreign matter and visible lumps, and it is graded by bound acrylonitrile content into three types, each with superior and qualified grades, against limits for total solids, viscosity, pH and residual volatile organics.

Test methods refer to the SH/T series for sampling, pH, mechanical stability, viscosity, coagulum, solids, surface tension, acrylonitrile content and residual monomers. It was issued on 28 December 2018 and has applied since 1 November 2019.

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Document preview — GB/T 25260.2-2018

National Standard of the People's Republic of China

ICS: 83.060
Classification: G 35

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Technical requirements

Foreword

GB/T 25260 "Synthetic Latex" is divided into three parts.

--- Part 1. Carboxyl styrene butadiene latex (XSBRL) 56C, 55B;

--- Part 2. carboxylated nitrile latex (XNBRL);

--- Part 3. Chloroprene latex.

This part is the second part of GB/T 25260.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 25260 specifies the technical requirements, test methods, inspection rules, marking and accompanying of carboxylated nitrile latex (XNBRL). Line documents as well as packaging, transportation and storage.

This section applies to carboxylated nitrile latex prepared by emulsion polymerization using butadiene, acrylonitrile and unsaturated carboxylic acid as main monomers.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

SH/T 1149 synthetic rubber latex sampling

SH/T 1150-2011 Determination of pH of synthetic rubber latex

Determination of high-speed mechanical stability of SH/T 1151 synthetic latex

SH/T 1152-2014 Determination of apparent viscosity of synthetic rubber latex

SH/T 1153-2011 Determination of coagulum content (sieving residue) of synthetic rubber latex

SH/T 1154-2011 Determination of total solid content of synthetic rubber latex

SH/T 1156-2014 Determination of surface tension of synthetic rubber latex

Determination of acrylonitrile content in nitrile latex by SH/T 1503-2014

SH/T 1760-2007 Determination of residual monomers and other organic components in synthetic rubber latex Liquid injection method

3 Technical requirements

3.1 Appearance. XNBRL is a white emulsion with no foreign matter and visible agglomerates.

3.2 Technical indicators. The technical indicators of XNBRL should meet the requirements of Table 1, and be determined according to the test method given in Chapter 4.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

SH/T 1151

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