ISO 27996:2009

Aerospace fluid systems - Elastomer seals - Storage and shelf life

ISO 27996:2009 is applicable to the general requirements for data recording procedures, packaging, and storing of elastomeric seals and seal assemblies which include an elastomeric element prior to the seal being assembled into hardware components. The requirements for packaging are an integral part of the controlled storage procedure and provide a means of positive product identity from the time of manufacture to the time of assembly into a component. ISO 27996:2009 does not establish limitations or storage times for assembled components nor the operating life of these components. The information contained in ISO 27996:2009 is intended for use by those organizations that do not have specific requirements or recommendations already in place for the control of elastomeric seals and seal assemblies. ISO 27996:2009 can be specified in control, storage and procurement documents. However, when the requirements of ISO 27996:2009 are in conflict with the customer's requirements or specifications, the requirements of the customer's detailed specifications take precedence.

Systèmes de fluides pour l'aéronautique et l'espace — Joints élastomères — Stockage et durée de conservation

General Information

• Status: Withdrawn
• Publication Date: 02-Feb-2009
• ICS: 49.080 - Aerospace fluid systems and components
• ICS: 83.140.50 - Seals
• Technical Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Drafting Committee: ISO/TC 20/SC 10/WG 1 - Joint ISO/TC 20/SC 10 - ISO/TC 131/SC 7 WG: Seals and seal retainers
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 14-Feb-2024
• Completion Date: 13-Dec-2025

Relations

• Revised: ISO 27996:2024 - Aerospace fluid systems - Elastomer seals - Storage and shelf life
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 27996
First edition
2009-02-01
Aerospace fluid systems — Elastomer
seals — Storage and shelf life
Systèmes de fluides pour l'aéronautique et l'espace — Joints
élastomères — Stockage et durée de conservation

Reference number
©
ISO 2009
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©  ISO 2009
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ii © ISO 2009 – All rights reserved

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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 27996 was prepared by Technical Committee ISO/TC 20, Aircraft and Space Vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
Introduction
In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within
an enclosed circuit. Components are designed to meet these requirements under varying conditions. Testing
of components to meet performance requirements provides users a basis of assurance for determining design
application and for checking component compliance with their stated requirements.

iv © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 27996:2009(E)

Aerospace fluid systems — Elastomer seals — Storage and
shelf life
1 Scope
This International Standard is applicable to the general requirements for data recording procedures,
packaging, and storing of elastomeric seals and seal assemblies which include an elastomeric element prior
to the seal being assembled into hardware components.
The requirements for packaging are an integral part of the controlled storage procedure and provide a means
of positive product identity from the time of manufacture to the time of assembly into a component.
This International Standard does not establish limitations or storage times for assembled components nor the
operating life of these components.
The information contained in this International Standard is intended for use by those organizations that do not
have specific requirements or recommendations already in place for the control of elastomeric seals and seal
assemblies.
This International Standard can be specified in control, storage and procurement documents. However, when
the requirements of this International Standard are in conflict with the customer's requirements or
specifications, the requirements of the customer's detailed specifications take precedence.
2 Normative references
The following referenced documents are indispensable for the application 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 1629, Rubbers and lattices — Nomenclature
ISO 5598, Fluid power systems and components — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.
3.1
date of vulcanization
date on which the elastomer product was vulcanized
NOTE Date of vulcanization is expressed in quarters (Q) of a year.
EXAMPLE 4Q08 (October to December, 2008).
3.2
elastomer
material that possesses elastic properties and has undergone vulcanization and/or conversion into a finished
product
NOTE The basic building block of elastomer is the rubber polymer it contains.
3.3
end user
user carrying out the installation into a hardware component which can include an aircraft
3.4
extended storage life
period for which an elastomer seal element moulded from class III material and properly packaged can be
stored after the initial storage period and the successful reinspection and testing of representative samples
3.5
hardware component
unit in which the elastomeric seal element is installed
3.6
installation date
date of the first installation into a hardware component
3.7
limited storage life
period of time during which an elastomeric seal element which has not been properly packaged by the
manufacturer in an expedient manner after vulcanization can be installed without first testing for product
integrity
3.8
rubbers
polymeric building blocks of an elastomer’s chemical composition
NOTE Rubbers are further defined in ISO 1629.
3.9
seal
elastomeric seal configuration or an assembly with an elastomeric element which prevents the excursion of
media on one side of the product from migrating to the other side
3.10
storage life
period of time, in quarters of a year, from the date of vulcanization until installation into a hardware component
NOTE The storage life is counted from the quarter following the date of vulcanization.
3.11
storage life limit
maximum period of time, starting from the quarter following vulcanization, that an elastomeric seal element,
appropriately packaged, can be stored under specific conditions, after which time it is regarded as
unserviceable for the purposes for which it was originally manufactured
4 General
The life of elastomeric seal elements is reduced by the influence of environmental factors, e.g. ozone, heat
and light. To extend life to the full storage life limit, the seal elements shall be properly packaged and certified
as such by the manufacturer as quickly as possible following vulcanization. If the seal elements are not
properly packaged and certified as such by the manufacturer, then the limited storage life requirement is
followed and package labels shall indicate this.
2 © ISO 2009 – All rights reserved

5 Packaging
5.1 General
Unless otherwise specified by the customer at the time of order, the elastomeric seal or seal assembly shall
be packaged:
a) in individually sealed envelopes by the manufacturer, or
b) in individually sealed packets in multiple envelopes by the manufacturer, provided that individually
packaged elastomeric seals or assemblies can be removed without affecting the seal integrity of the other
packets.
The packaging shall be carried out in an atmosphere in which the relative humidity is not greater than 65 %.
Contamination by oil, grease, etc. shall be avoided.
Seal assemblies (all components) shall be packaged in the same sealed envelope so that all elements of the
assembly are present when the package is opened.
5.2 Packaging materials
All packaging materials shall be free of copper naphthenates or creosote preservatives which can degrade
rubber.
Suitable materials include kraft bags (polyethylene coated kraft paper) and polyethylene bags more than
0,075 mm thick and certified to be ultraviolet (UV) resistant. Opaque packaging is preferred, but certified UV
resistant materials can be used if available. Metal foil bags can be used provided they are salt free.
5.3 Labelling
Each package or container shall be labelled with the following information, which shall be visible from the
outside of the package without breaking the seal:
a) manufacturer's part number;
b) specification number and revision level;
c) customer's part number and/or contract number (if requested);
d) quantity in package;
e) manufacturer's name and/or identity number [e.g. commercial and government entity (CAGE) code;
supplier number];
f) quarter and year of cure or manufacturer of the rubber component [e.g. 3Q08 (July to September 2008)];
g) manufacturer's batch number;
h) rubber class designation in accordance with ISO 1629;
i) identity of packager and package date, if different than manufacturer.
Expiration date is not required to be on the label and is added only when purchaser specifically requests the
addition.
6 Storage
6.1 Temperature
The storage temperature should be in the range of 5° C to 30 °C, except when higher or lower temperatures
are caused by temporary climate changes. Articles shall be stored away from direct sources of heat such as
boilers, radiators and direct sunlight.
NOTE If the storage temperature is below 10 °C, it is important to take care during the handling of stored articles, as
they might have sti
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