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: Published
• 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: 9092 - International Standard to be revised
• Completion Date: 20-May-2020

Relations

• Revised: ISO/FDIS 14624-5 - 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 2006

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ii © ISO 2006 – All rights reserved
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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

© ISO 2006 – All rights reserved iii
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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.

© ISO 2006 – All rights reserved v
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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
© ISO 2006 – All rights reserved 1
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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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