ISO 14624-5:2006

Space systems — Safety and compatibility of materials — Part 5: Determination of reactivity of system/component materials with aerospace propellants

ISO 14624-5:2006 specifies test equipment and techniques used to identify interactions resulting from exposure of a material to an aerospace fluid. ISO 14624-5:2006 may be used to determine the reactivity of system and component materials with aerospace fluids. It is applicable for determining interactive reactions between propellants and materials used in the design, construction, and operation of propellant storage, transfer, and flight systems. While this procedure is an excellent quick screen test for long-term propellant compatibility, it is semi-qualitative, and (if exposures exceed twelve months) long-term tests need to be used to quantify degradation as a function of time under use conditions.

Systèmes spatiaux — Sécurité et compatibilité des matériaux — Partie 5: Détermination de la réactivité des matériaux des systèmes/composants avec les ergols spatiaux

General Information

• Status: Withdrawn
• Publication Date: 18-Apr-2006
• ICS: 49.025.01 - Materials for aerospace construction in general
• ICS: 49.140 - Space systems and operations
• Technical Committee: ISO/TC 20/SC 14 - Space systems and operations
• Drafting Committee: ISO/TC 20/SC 14/WG 1 - Design engineering and production
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-Jun-2023

Relations

• Revised: ISO 14624-5:2023 - Space systems — Safety and compatibility of materials — Part 5: Determination of reactivity of system/component materials with aerospace propellants
• Effective Date: 23-Aug-2014

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14624-5
First edition
2006-04-15

Space systems — Safety and
compatibility of materials —
Part 5:
Determination of reactivity of
system/component materials with
aerospace propellants
Systèmes spatiaux — Sécurité et compatibilité des matériaux —
Partie 5: Détermination de la réactivité des matériaux des
systèmes/composants avec les ergols spatiaux




Reference number
ISO 14624-5:2006(E)
©
ISO 2006

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ISO 14624-5:2006(E)
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ISO 14624-5:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Fluid transfer, storage, and flight systems . 2
4.1 General. 2
4.2 Test criteria. 2
4.3 Sample . 3
4.4 Test system . 3
4.5 Procedure . 4
4.6 Precision. 6
4.7 Good laboratory practices . 6
Annex A (informative) Example forms . 7
Bibliography . 11

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ISO 14624-5:2006(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 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 14624-5 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 14, Space systems and operations.
ISO 14624 consists of the following parts, under the general title Space systems — Safety and compatibility of
materials:
⎯ Part 1: Determination of upward flammability of materials
⎯ Part 2: Determination of flammability of electrical-wire insulation and accessory materials
⎯ Part 3: Determination of offgassed products from materials and assembled articles
⎯ Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen-
enriched environments
⎯ Part 5: Determination of reactivity of system/component materials with aerospace propellants
⎯ Part 6: Determination of reactivity of processing materials with aerospace fluids
⎯ Part 7: Determination of permeability and penetration of materials to aerospace fluids
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ISO 14624-5:2006(E)
Introduction
This purpose of this part of ISO 14624 is to identify changes resulting from exposure of a material to an
aerospace fluid that renders either the material or the fluid unsuitable for use.
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INTERNATIONAL STANDARD ISO 14624-5:2006(E)

Space systems — Safety and compatibility of materials —
Part 5:
Determination of reactivity of system/component materials with
aerospace propellants
1 Scope
This part of ISO 14624 specifies test equipment and techniques used to identify interactions resulting from
exposure of a material to an aerospace fluid.
This part of ISO 14624 may be used to determine the reactivity of system and component materials with
aerospace fluids. It is applicable for determining interactive reactions between propellants and materials used
in the design, construction, and operation of propellant storage, transfer, and flight systems. While this
procedure is an excellent quick screen test for long-term propellant compatibility, it is semi-qualitative, and (if
exposures exceed 12 months) long-term tests need to be used to quantify degradation as a function of time
under use conditions.
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 4954:1993, Steels for cold heading and cold extruding
ISO 14951-3, Space systems — Fluid characteristics — Part 3: Nitrogen
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
degradation
adverse physical or chemical change in a substance
3.2
immersion test
test in which the fluid covers the entire sample for the duration of the test
3.3
propellants
fluids, such as hydrazine and monomethylhydrazine, and oxidizers usually used for space projects
3.4
reaction
chemical change in which a substance decomposes, combines with other substances, or interchanges
constituents with other substances
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ISO 14624-5:2006(E)
4 Fluid transfer, storage, and flight systems
4.1 General
4.1.1 Procedure
This procedure is applicable for determining interactive reactions between propellants and materials used in
the design, construction, and operation of propellant storage, transfer, and flight systems. The sample is
immersed in the test fluid for 48 h at the maximum system temperature or 71 °C (160 °F), whichever is higher.
This accelerated test provides semi-qualitative information. Tests used to evaluate the long-term interaction of
materials with reactive fluids shall be conducted for a period of time no less than that of the anticipated time of
use.
4.1.2 Safety
The proper safety equipment must be worn by the technician performing the test. A face shield, gloves, and a
laboratory coat or apron shall be worn when handling the test fluids. The laboratory conducting the tests shall
have a detailed emergency plan in the event of a runaway reaction.
4.2 Test criteria
4.2.1 Screening test
Exposure of the material (screening test) to the fluid for 2 h at ambient temperature and pressure shall not
visibly change either the material or the fluid.
4.2.2 Immersion test
The sample immersed in the test fluid for 48 h at test temperature shall not cause a pressure rate increase
that is 1,5 times more than the pressure rate increase that is caused by ISO 4954 stainless steel when
exposed to the identical fluid and conditions. The standard test temperature for the hydrazine propellants (see
ISO 14951-6 and ISO 14951-7) is 71 °C. This temperature shall be used when the intent of the test is ranking
of materials or comparison to literature information. Other temperatures may be used to test materials for
specific applications. For other fluids, the standard test temperature will depend upon the vapour pressure of
that fluid; for example, the standard temperature for nitrogen tetroxide (see ISO 14951-5) is 21 °C.
For fluids that do not decompose into gaseous products at the test temperature (for example, nitrogen
tetroxide), the pressure increase shall not be greater than the vapour pressure of the fluid after exposure to
polytetrafluoroethylene (for nonmetals) or ISO 4954 stainless steel (for metals).
4.2.3 Post-test analysis
After the sample has been exposed, decontaminated, and dried, no visible change in colour or texture of the
material or test fluid shall be apparent. In addition, the sample mass change shall not be greater than ± 2 %.
The following also apply:
⎯ the mass of impurities in the fluid after exposure to the material shall not be greater than twice the mass
of impurities in the identical fluid after exposure to polytetrafluoroethylene (for nonmetals) or ISO 4954
stainless steel (for metals);
− − −
⎯ halide (F , Cl , Br ) concentrations in the fluid after exposure to the material shall not exceed the
appropriate ISO specification for the fluid purity.
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