ISO 24483:2023

INTERNATIONAL ISO
STANDARD 24483
First edition
2023-04
Epoxidized natural rubber —
Specifications
Caoutchouc naturel époxydé — Spécifications
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Material composition .2
5 Grade structure . 2
6 Specification of requirement .2
7 Sampling . 3
8 Packaging. 3
Bibliography . 4
iii
Foreword
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Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
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iv
Introduction
Significant developments have taken place in the supply of raw natural rubber, especially in relation to
the number of different grades that are technically specified. The constant viscosity (CV), latex (L) and
gel content (LoV) grades have been added in addition to the initial grades covered in the first edition
of ISO 2000. The development and availability of physical and/or chemically modified grades are now
reported in the technical literature with the aim to expand natural rubber (NR) applications in rubber
products. Demand and acknowledgment of these modified grades grow from year to year. On this note,
it is important to establish a standard reference for the specification related to these modified natural
rubber grades. In this document the emphasis is given to the epoxidized natural rubber (ENR) grade
produced through a chemical modification route on natural rubber.
This document encompasses natural raw rubber specification for ENR produced through a chemical
modification route known as epoxidation reaction. Typically, the most economical epoxidation reaction
route is through the in situ peracid method. Through the process the peracid is formed from hydrogen
peroxide and formic acid. The epoxidation reaction involves with substitution of the NR double bond
structure (C=C) with epoxy ring structure (C-O-C) which later determines the grade of the ENR rubber.
In general, any level of epoxidati
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