ISO 17278:2020

INTERNATIONAL ISO
STANDARD 17278
Second edition
2020-04
Rubber, raw natural — Determination
of the gel content of technically
specified rubber (TSR)
Caoutchouc naturel brut — Détermination de la teneur en gel des
caoutchoucs spécifiés techniquement (TSR)
Reference number
ISO 17278:2020(E)
©
ISO 2020

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ISO 17278:2020(E)

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ii © ISO 2020 – All rights reserved

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ISO 17278:2020(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent . 1
6 Apparatus . 2
7 Conditions. 2
8 Procedure. 2
8.1 Number of test samples . 2
8.2 Procedure . 2
9 Expression of the result. 3
10 Precision . 4
11 Test report . 4
Annex A (informative) Precision . 5
Bibliography . 7
© ISO 2020 – All rights reserved iii

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ISO 17278:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
This second edition cancels and replaces the first edition (ISO 17278:2013), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— to solve the ambiguity with the scope, the term “LoV-TSR sample” in Clause 4 has been replaced by
the term “TSR sample”;
— in 8.1, the words “two samples” have been replaced by “two test samples”;
— in 5.2, acetone has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

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INTERNATIONAL STANDARD ISO 17278:2020(E)
Rubber, raw natural — Determination of the gel content of
technically specified rubber (TSR)
WARNING — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies a method for the determination of gel content for technically specified
rubbers (TSR).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2000:2014, Rubber, raw natural — Guidelines for the specification of technically specified rubber (TSR)
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
technically specified rubber
TSR
natural rubber obtained from the latex of Hevea brasiliensis (typically processed into block rubber), and
having properties complying with the criteria for the grade concerned
4 Principle
A TSR sample is d
...