ISO 14624-7:2006
(Main)Space systems — Safety and compatibility of materials — Part 7: Determination of permeability and penetration of materials to aerospace fluids
Space systems — Safety and compatibility of materials — Part 7: Determination of permeability and penetration of materials to aerospace fluids
ISO 14624-7:2006 specifies test equipment and techniques used to identify interactions resulting from exposure of a material to an aerospace fluid. ISO 14624-7:2006 can be used to determine the reactivity of materials with aerospace fluids. It provides a means to determine the effects of minor amounts of aerospace fluids, such as in a splash or spill, on materials used in ground support processing operations, and in the selection of personal safety equipment.
Systèmes spatiaux — Sécurité et compatibilité des matériaux — Partie 7: Détermination de la perméabilité et de la pénétration des matériaux aux fluides aérospatiaux
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14624-7
FIrst edition
2006-04-15
Space systems — Safety and
compatibility of materials —
Part 7:
Determination of permeability and
penetration of materials to aerospace
fluids
Systèmes spatiaux — Sécurité et compatibilité des matériaux —
Partie 7: Détermination de la perméabilité et de la pénétration des
matériaux aux fluides aérospatiaux
Reference number
ISO 14624-7:2006(E)
©
ISO 2006
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ISO 14624-7:2006(E)
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ii © ISO 2006 – All rights reserved
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ISO 14624-7:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Safety precautions. 2
4.1 Laboratory facilities. 2
4.2 Protective clothing. 2
5 Test procedure . 2
5.1 Inspection of sample on receipt. 2
5.2 Preparation of sample . 2
5.3 Penetration test. 3
5.4 Permeation test . 4
Annex A (informative) Examples of forms. 7
Bibliography . 9
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ISO 14624-7:2006(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.
ISO 14624-7 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 14624-7:2006(E)
Introduction
The purpose of this part of ISO 14624 is to provide procedures to determine the permeability rate and
penetration resistance of materials exposed to aerospace fluids.
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INTERNATIONAL STANDARD ISO 14624-7:2006(E)
Space systems — Safety and compatibility of materials —
Part 7:
Determination of permeability and penetration of materials to
aerospace fluids
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 can be used to determine the reactivity of materials with aerospace fluids. It provides a
means to determine the effects of minor amounts of aerospace fluids, such as in a splash or spill, on materials
used in ground support processing operations, and in the selection of personal safety equipment.
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, Steels for cold heading and cold extruding
ISO 6529, Protective clothing — Protection against chemicals — Determination of resistance of protective
clothing materials to permeation by liquids and gases
ISO 6530, Protective clothing — Protection against liquid chemicals — Test method for resistance of materials
to penetration by liquids
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
aerospace fluid
fluid that is commonly used in the fabrication, development, processing of materials and production of
aerospace and ground support equipment
EXAMPLES Cleaning agents, lubricants and solvents.
3.2
degradation
adverse physical or chemical change in a substance
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ISO 14624-7:2006(E)
3.3
reaction
chemical change in which a substance decomposes, combines with other substances, or interchanges
constituents with other substances
4 Safety precautions
4.1 Laboratory facilities
Some aerospace fluids are considered to be toxic chemicals. These chemicals shall only be exposed to room
atmosphere inside an approved laboratory hood. Separate, dedicated hoods shall be used for the oxidizers
and fuels.
4.2 Protective clothing
Personal protective clothing shall be worn by personnel when performing these tests. The minimum protection
required is fluid-compatible gloves, laboratory apron and face shield or goggles.
5 Test procedure
5.1 Inspection of sample on receipt
When received, the test material shall be accompanied by proper identification. The minimum information
required is the manufacturer, trade name, composition, specification, generic name and batch/lot number (if
known). A visual inspection shall be performed and any anomalies shall be noted. A suitable sample
identification form is shown in Table A.1.
5.2 Preparation of sample
5.2.1 General
The sample shall be tested in the intended use form (such as sheets or foams) and in the as-received
thickness.
5.2.2 Sample cleaning
Samples shall be cleaned and dried to the end-use specifications. Contamination on the surfaces of solid,
nonporous samples shall be removed by washing with deionized water and mild detergent, rinsing with
deionized water, and drying with filtered, gaseous nitrogen. Particulates on the surfaces of solid, porous
samples shall be removed with filtered, gaseous nitrogen meeting the requirements of ISO 14951-3.
5.2.3 Sample inspection
The sample shall be inspected to ensure it is at the specified worst-case thickness. Flaws and any residual
contamination shall be noted. If the flaws result from sample preparation at the test facility, new samples shall
be prepared. Samples with flaws that inordinately increase the surface area to bulk mass ratios shall not be
tested. Samples shall be weighed and individually identified.
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ISO 14624-7:2006(E)
5.3 Penetration test
5.3.1 General
This test is used to determine the possible liquid penetration of materials when exposed to aerospace fluids or
other chemicals of interest.
5.3.2 Test procedure
The test procedure shall be as follows.
a) Place an appropriately sized sample of the test material (see Figure 1) over a beaker.
b) Add the test fluid, approximately 1 ml of the specified test fluid, to the centre of the sample, taking care
not to expose the edges of the sample to the fluid, and start the timer.
c) Allow the test fluid to stand on the sample for the specified exposure time.
d) Add test fluid as required to maintain a liquid film on the test sample during the specified exposure time.
e) Carefully observe for
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