SIST ISO 2230:2003

INTERNATIONAL ISO
STANDARD 2230
Second edition
2002-04-15
Rubber products — Guidelines for storage
Produits à base d'élastomères — Lignes directrices pour le stockage

Reference number
ISO 2230:2002(E)
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ISO 2230:2002(E)
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ISO 2230:2002(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification of rubber types according to their relative susceptibility to deterioration . 2
5 Packaging . 4
6 Storage . 5
7 Inspection, testing and recording of data during storage . 7
Annex
A Recommendations for inspection and testing of specific products . 10
Bibliography. 11
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ISO 2230:2002(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 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 2230 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 4, Products (other than hoses).
This second edition cancels and replaces the first edition (ISO 2230:1973), which has been technically revised.
Annex A of this International Standard is for information only.
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ISO 2230:2002(E)
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 unwanted changes in properties. Such changes may result from
degradation, in which case they may include excessive hardening, softening, cracking, crazing and other surface
effects. Other changes may be caused by deformation, contamination or mechanical damage.
In preparing this revision, the requirements of different users and the multiplicity of rubber types and products have
been factors of major consideration. 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, and to do so a system of storage control, proper packaging and periodic
inspection becomes necessary.
A system of recording, for the proper maintenance of storage and inspection data, is included to assist in verifying
that the provisions of this standard are maintained in association with common elements associated with product
specifications and their verification through conducting of statistically significant methods of test. Further guidance
can be found, to supplement the information contained in this standard, in ISO 9000, ISO 9001 and ISO 9004.
In this standard, 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.
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INTERNATIONAL STANDARD ISO 2230:2002(E)
Rubber products — Guidelines for storage
WARNING — Persons using this International Standard should be familiar with normal laboratory practice.
This standard 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 and to ensure compliance with
any national regulatory conditions.
1 Scope
This International Standard gives guidelines for the 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.
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
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 1629:1995, Rubber and latices — Nomenclature
ISO 4591:1992, Plastics — Film and sheeting — Determination of average thickness of a sample, and average
thickness and yield of a roll, by gravimetric techniques (gravimetric thickness)
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
initial storage period
the maximum period, starting from the time of manufacture, for which a rubber product, appropriately packaged, may
be stored under specified conditions before a sample needs to be inspected or re-tested
3.2
extension storage period
the period for which a rubber product, appropriately packaged, may be stored after the initial storage period, before
further inspection and re-testing is necessary
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ISO 2230:2002(E)
3.3
storage life
the 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 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
the irreversible change of material properties during exposure to an environment, for a period of time
4 Classification of rubber types according to their relative susceptibility to deterioration
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:
Group A: rubbers with moderate susceptibility to deterioration by ageing, as listed in Table 1.
The following additional rubbers are classified as group A:
— all new vulcanizable rubbers until their storage capabilities have been established;
— all thermoplastic rubbers until their storage capabilities have been established;
— any rubber that cannot be classified as group B or group C.
Group B: rubbers with low susceptibility to deterioration by ageing, as listed in Table 2.
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 from ISO 1629 Common name
BR Butadiene rubber Polybutadiene
NR Isoprene rubber, natural Natural rubber
IR Isoprene rubber, synthetic Polyisoprene
SBR Styrene-butadiene rubber SBR
AU Polyester urethane rubber Polyurethane
EU Polyether urethane rubber Polyurethane
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ISO 2230:2002(E)
Table 2 — Group B rubbers
Abbreviation Chemical name from ISO 1629 Common name
NBR Acrylonitrile-butadiene rubber Nitrile
NBR/PVC Blend of acrylonitrile-butadiene rubber and Nitrile/PVC
poly(vinyl chloride)
XNBR Carboxylic-acrylonitrile-butadiene rubber Carboxylated rubber
HNBR Hydrogenated NBR (with some unsaturation) Hydrogenated nitrile
CO, ECO Polychloromethyloxiran and copolymer Epichlorohydrin
ACM Copolymer of ethylacrylate (or other acrylates) and a Acrylic
small amount of a monomer which facilitates
vulcanization
CR Chloroprene rubber Neoprene
IIR Isobutene-isoprene rubber Butyl
BIIR Bromo-isobutene-isoprene rubber Bromobutyl
CIIR Chloro-isobutene-isoprene rubber Chlorobutyl
Table 3 — Group C rubbers
Abbreviation Chemical name from ISO 1629 Common name
CM Chloropolyethylene Chlorinated polyethylene
CSM Chlorosulfonylpolyethylene Chlorosulfonated polyethylene
EPM Ethylene-propylene copolymer EPM, EPR
EPDM Terpolymer of ethylene, propylene and a diene with the EPDM
residual unsaturated portion of the diene in the side chain
FKM Rubber having fluoro, perfluoroalkyl or perfluoroalkoxy Fluorocarbon
substituent groups on the polymer chain
Q Silicone rubber Silicone
FMQ Silicone rubber having both methyl and fluorine
substituent groups on the polymer chain
PMQ Silicone rubber having both methyl and phenyl
substituent groups on the polymer chain
PVMQ Silicone rubber having methyl, phenyl and vinyl
substituent groups on the polymer chain
MQ Silicone rubber having only methyl substituent groups on
the polymer chain, such as dimethyl polysiloxane
VMQ Silicone rubber having both methyl and vinyl substituent
groups on the polymer chain
4.2 Blends and composites
A blend of two or more rubbers of different groups should be classified as the group of the rubber(s) forming more
than 50 % of the blend. If two rubbers are in equal proportions, the blend belongs to the group having the higher
susceptibility to deterioration. For a composite product containing components made out of different rubbers,
classification should be as the group of the rubber considered most susceptible to deterioration.
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ISO 2230:2002(E)
5 Packaging
5.1 General
Unless otherwise specified in the appropriate product specification, rubber products should be:
— enclosed in individual sealed envelopes;
or
— enclosed in individual sealed pockets in a multiple envelope provided that they can be removed without affecting
the sealing of the remainder of the items in the package;
or
— if it is not possible to package the items in either of these ways, suitably enclosed or wrapped so as to prevent
free access of air.
NOTE 1 Under certain conditions silicone rubber (Q) deteriorates if totally enclosed and in these cases free access of air is
advisable provided other deteriorating agencies (see 6.2) are avoided.
NOTE 2 It is advisable that packaging be completed as soon as is reasonably practicable after curing in the case of a vulcanized
rubber product, or as soon as reasonably practicable after manufacture in the case of a thermoplastic rubber product.
The packaging should be carried out in an atmosphere in which the relative humidity is not greater than 65 % (see
6.2.2) and under conditions that will ensure freedom from contamination by dust, oil, grease, etc.
If it is necessary for rubber components to be packed in assembly sets, the components should be retained in their
original identifying envelopes within the main package.
No part should be tied or tagged in such a way as to cause damage.
5.2 Packaging materials
All material of any containers, covering or wrapping should be free from substances, such as copper naphthenates
or creosote preservatives, having a degrading effect on the rubber.
Heat-sealable opaque materials should be used unless it can be demonstrated that this is not practicable in the
circumstances or would distort the packaged product.
NOTE 1 Some suitable materials are polyethylene-coated kraft paper, aluminium foil/paper/polyethylene laminate and opaque
polyethylene film.
Plasticized poly(vinyl chloride) (PVC) fi
...