ISO 7725:2020 PDF

Name: ISO 7725:2020 — Rubber and rubber products — Determination of chlorine and bromine content
SKU: ISO 7725:2020
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Rubber and rubber products — Determination of chlorine and bromine content

Название (английский):

ISO 7725:2020

Rubber and rubber products — Determination of chlorine and bromine content

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 20
Дата публикации:: 23 января 2020 г.
Издание:: ISO IS 7725 edition 2 version 1
ICS:: 83.060

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7725:2020 - Rubber and rubber products - Determination of chlorine and bromine content - specifies laboratory methods to quantify chlorine and bromine (halogen) content in raw, vulcanized and unvulcanized rubber. The standard covers natural rubber and common synthetic rubbers (isoprene, SBR, BR, butyl and halogenated butyl, nitrile, EPDM, chloroprene and epichlorohydrin). It defines sample-preparation routes and two analytical approaches: ion chromatography (IC) and potentiometric titration.

Key topics and technical requirements

Scope and materials: Applies to raw rubber and rubber compounds; detects halogens present in polymer chains, additives or contaminants.

Sample preparation (normative): Three combustion-based methods to convert sample to analysable solution:

Tubular furnace combustion (Annex A)
Oxygen combustion flask (Annex B)
Oxygen combustion bomb (Annex C) Two independent solutions per sample are required.

Analytical methods:

Method A - Ion chromatography (Clause 6): Uses certified chloride/bromide standards, eluent and anion-exchange columns with conductivity detection (optionally with a suppressor). Preferred for very low halogen levels because of higher sensitivity.
Method B - Potentiometric titration (Clause 7): An established wet-chemistry titration route improved in this edition; suitable for routine determinations where titration end-points are well-defined.

Calibration and calculation: Calibration curves from multiple standard concentrations are required. Results are calculated from sample and blank concentrations and reported as % mass of chlorine or bromine.

Precision, reporting and safety: The standard specifies precision data (Clause 8) and test-report content (Clause 9). Warnings emphasize normal laboratory practice and environmental/safety handling of combustion and reagents. Hazardous reagents (e.g., mercury nitrate, hydrazine) have been removed from this edition.

Practical applications and typical users

Quality control in rubber product manufacturing - verify halogen levels for performance and compatibility (e.g., flame-retardancy, vulcanization behavior).

Incoming raw-material inspection for natural and synthetic rubber batches.

Failure analysis and R&D - identify halogen-related degradation or contamination.

Regulatory and environmental testing - monitor halogenated compound presence for compliance. Typical users: analytical laboratories, rubber compounders, OEMs, material scientists, and regulatory testing labs.

Related standards (referenced)

ISO 1795 - Sampling of raw rubber

ISO 4661-2 - Preparation of samples and test pieces for chemical tests

ISO 3696 - Water for analytical laboratory use

Keywords: ISO 7725:2020, chlorine and bromine determination, rubber testing, halogen content, ion chromatography, potentiometric titration, sample combustion methods.

ISO 7725:2020 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and typical users

Related standards (referenced)

Технические детали

ISO 1795:2007

Rubber, raw natural and raw synthetic — Sampling and further preparative procedures

BS ISO 4661-2:2018

Rubber, vulcanized. Preparation of samples and test pieces - Chemical tests

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)