ISO 2230:2026

International
Standard
ISO 2230
Third edition
Rubber products — Guidelines for
2026-03
storage
Produits à base d'élastomères — Lignes directrices pour le
stockage
Reference number
© ISO 2026
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification of rubber types . 2
4.1 General .2
4.2 Blends and composites .3
5 Packaging. 3
5.1 General .3
5.2 Packaging materials.4
5.3 Labelling .4
6 Storage . 4
6.1 General .4
6.2 Storage conditions .5
6.2.1 Temperature .5
6.2.2 Humidity .5
6.2.3 Light .5
6.2.4 Radiation .5
6.2.5 Ozone .5
6.2.6 Deformation .6
6.2.7 Contact with liquid and semi-liquid materials .6
6.2.8 Contact with metals.6
6.2.9 Contact with dusting powder .6
6.2.10 Contact between different products .6
6.2.11 Products with rubber-to-metal bonds .6
6.2.12 Proofed fabrics and rubber sheeting .6
6.2.13 Rotation of stocks .6
7 Inspection, testing and recording of data during storage . 7
7.1 Recording .7
7.2 Inspection .7
7.2.1 Inspection before extension storage .7
7.2.2 Visual inspection .7
7.2.3 Testing .7
7.3 Storage periods .7
7.3.1 Assessment at the end of the initial period .7
7.3.2 Extension storage period .8
7.3.3 Duration of storage .8
7.4 Repackaging .8
Annex A (informative) Recommendations for inspection and testing of specific products . 9
Bibliography .11

iii
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 through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
This third edition cancels and replaces the second edition (ISO 2230:2002), which has been technically
revised.
The main changes are as follows:
— addition of new polymers to Tables 1, 2 and 3 in Clause 4;
— revision of the classification of some polymers (Clause 4);
— revision of the temperature range for storage conditions (6.2).
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
Introduction
Many rubber products and components are stored for long periods before being put into service, and thus it
is important they are stored in conditions that minimize the unwanted changes in properties. Such changes
can result from degradation, in which case they can potentially include excessive hardening, softening,
cracking, crazing and other surface effects. Other changes can be caused by deformation, contamination or
mechanical damage.
The requirements of different users and the multiplicity of rubber types and products are factors of major
consideration in this document. It is recognized that some rubbers are more susceptible than others to
deterioration by such factors as heat, light, ozone, oxygen and humidity. Exposure to these factors should
therefore be minimized in order to extend storage life. To do so, there must be a system of storage control,
proper packaging and periodic inspection.
A system of recording, for the proper maintenance of storage and inspection data, is included in order to
assist in verifying that the provisions of this document are maintained in association with common elements
associated with product specifications and their verification through conducting of statistically significant
methods of test. Refer to ISO 9000, ISO 9001 and ISO 9004 to supplement the information contained in this
document.
In this document, only the causes of generation of deleterious influences such as ozone and radiation are
mentioned as being prohibited. Methods for measuring concentrations or intensities of these are not within
the scope of this standard.
Recommendations are included in Annex A for the inspection and testing of specific products.

v
International Standard ISO 2230:2026(en)
Rubber products — Guidelines for storage
1 Scope
This document gives guidelines for inspection, recording procedures, packaging and storage of products,
assemblies and components made from vulcanized or thermoplastic rubber prior to being put into
circulation.
It is applicable to both solid and cellular rubber products prepared from dry raw rubber, latex or other
sources. It is not intended for use with raw rubber in bale, liquid (solution or emulsion) or particulate form,
storage guidance for which is given in ISO 7664.
NOTE The recommendations for packaging form an integral part of the controlled storage procedure, as well as
providing means of identifying the material and product.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
initial storage period
maximum period, starting from the time of manufacture, for which a rubber product, appropriately
packaged, may be stored under specified conditions before a sample must be inspected or re-tested
3.2
extension storage period
period for which a rubber product, appropriately packaged, may be stored after the initial storage period,
before further inspection and re-testing is necessary
3.3
storage life
maximum period of time that a rubber product, appropriately packaged, may be stored, after which time it is
regarded as unserviceable for the purposes for which it was originally manufactured
Note 1 to entry: The storage life of a rubber product is influenced by its shape and size as well as its composition, with
thick products usually undergoing slower change due to degradation than thinner ones.
3.4
assembly
any product or component containing more than one element, one or more of which is made of rubber
3.5
ageing
irreversible change of material properties during exposure to an environment, for a period of time

4 Classification of rubber types
4.1 General
Unless otherwise specified in the product specification, rubber products should be classified (for the purpose
of storage) in terms of the relative susceptibility to deterioration of the rubber type used, as follows:
a) Group A: Rubbers with moderate susceptibility to deterioration by ageing, as listed in Table 1.
The following additional rubbers are classified as group A:
i) all new vulcanizable rubbers until their storage capabilities have been established;
ii) all thermoplastic rubbers until their storage capabilities have been established;
iii) any rubber that cannot be classified as group B or group C.
b) Group B: Rubbers with low susceptibility to deterioration by ageing, as listed in Table 2.
c) Group C: Rubbers which are highly resistant to deterioration by ageing, as listed in Table 3.
NOTE Attention is drawn to the following:
— resistance to deterioration can be influenced by compounding ingredients other than the type of base rubber;
— products can undergo changes during storage other than those caused by ageing of the rubber.
Table 1 — Group A rubbers
Abbreviation Chemical name (as per ISO 1629) Common name
BR Butadiene rubber Polybutadiene
DPNR Deproteinized natural rubber DPNR
ENR Epoxidised natural rubber ENR
IR Isoprene rubber, synthetic Polyisoprene
NR Natural rubber Natural rubber
SBR Styrene-butadiene rubber SBR
AU Polyester urethane rubber Polyurethane
EU Polyether urethane rubber Polyurethane
Table 2 — Group B rubbers
Abbreviation Chemical name (as per ISO 1629) Common name
BIIR Bromo-isobutene-isoprene rubber Bromobutyl rubber
CIIR Chloro-isobutene-isoprene rubber Chlorobutyl rubber
CO, ECO Polychloromethyloxiran and copolymer Epichlorohydrin
CR Chloroprene rubber Neoprene
HNBR Hydrogenated NBR (with some unsaturation) Hydrogenated nitrile
IIR Isobutene-isoprene rubber Butyl
NBR Acrylonitrile-butadiene rubber Nitrile
NBR/PVC Blend of acrylonitrile-butadiene rubber and poly(vi- Nitrile/PVC
nyl chloride)
XNBR Carboxylic-acrylonitrile-butadiene rubber Carboxylated rubber

Table 3 — Group C rubbers
Abbreviation Chemical name (as per ISO 1629) Common name
ACM Copolymer of ethyl acrylate (or other acrylates) and Acrylic rubber
a small amount of a monomer
AEM Copolymer of ethyl acrylate (or other acrylates) and AEM
ethylene
CM Chloropolyethylene Chlorinated polyethylene
CSM Chlorosulfonylpolyethylene Chlorosulfonated polyethylene
EPDM Terpolymer of ethylene, propylene and a diene with EPDM
the residual uns
...