ISO 7725:2020
Rubber and rubber products — Determination of chlorine and bromine content
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sample preparation
5.1 Sampling
5.2 Sample solutions
6 Method A — Ion chromatography
6.1 Reagents
6.2 Apparatus
6.3 Determination
6.3.1 Setting up the ion chromatograph
6.3.2 Preparation of the calibration curve
6.3.3 Measuring blank solutions and sample solutions
6.4 Calculation
7 Method B — Potentiometric titration
7.1 Reagents
7.2 Apparatus
7.3 Determination
7.4 Calculation
8 Precision
9 Test report
Annex A (normative) Preparation of sample solutions by the tubular furnace combustion method
Annex B (normative) Preparation of sample solutions by the oxygen combustion flask method
Annex C (normative) Preparation of sample solutions by the oxygen combustion bomb method
Annex D (informative) Conditions for ion chromatography
Annex E (informative) Precision results from an interlaboratory test programme
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sample preparation
5.1 Sampling
5.2 Sample solutions
6 Method A — Ion chromatography
6.1 Reagents
6.2 Apparatus
6.3 Determination
6.3.1 Setting up the ion chromatograph
6.3.2 Preparation of the calibration curve
6.3.3 Measuring blank solutions and sample solutions
6.4 Calculation
7 Method B — Potentiometric titration
7.1 Reagents
7.2 Apparatus
7.3 Determination
7.4 Calculation
8 Precision
9 Test report
Annex A (normative) Preparation of sample solutions by the tubular furnace combustion method
Annex B (normative) Preparation of sample solutions by the oxygen combustion flask method
Annex C (normative) Preparation of sample solutions by the oxygen combustion bomb method
Annex D (informative) Conditions for ion chromatography
Annex E (informative) Precision results from an interlaboratory test programme
Bibliography