ISO 14624-6:2006

INTERNATIONAL ISO
STANDARD 14624-6
FIrst edition
2006-04-15
Space systems — Safety and
compatibility of materials —
Part 6:
Determination of reactivity of processing
materials with aerospace fluids
Systèmes spatiaux — Sécurité et compatibilité des matériaux —
Partie 6: Détermination de la réactivité des matériaux de traitement
avec les fluides aérospatiaux
Reference number
©
ISO 2006
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©  ISO 2006
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ii © ISO 2006 – All rights reserved

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 Test methods. 4
Annex A (informative) Examples of forms. 10
Bibliography . 12

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 14624-6 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

iv © ISO 2006 – All rights reserved

Introduction
The 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 unsuitable for use or produces an exothermic reaction that
may result in a fire.
INTERNATIONAL STANDARD ISO 14624-6:2006(E)

Space systems — Safety and compatibility of materials —
Part 6:
Determination of reactivity of processing materials with
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 processing materials with aerospace fluids
either through intent or casual exposure. It provides a means to determine the effects of minor amounts of
fluids, such as a splash or spill, on materials used in ground support processing operations.
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 4599, Plastics — Determination of resistance to environmental stress cracking (ESC) — Bent strip
method
ISO 4954, 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
aerospace fluid
fluid that is commonly used in the fabrication, development and processing of materials and in the production
of aerospace and ground support equipment and propellants
EXAMPLES Cleaning agents, lubricants and solvents.
3.2
aerospace material
material used in the fabrication and/or production of ground support and flight components and systems
3.3
degradation
adverse physical or chemical change in a substance
3.4
exothermic reaction
chemical reaction that generates heat
3.5
ground support equipment
equipment used in the processing and preparation of flight hardware
3.6
immersion test
test in which the fluid covers the entire sample for the duration of the test
3.7
reaction
chemical change in which a substance decomposes, combines with other substances, or interchanges
constituents with other substances
3.8
test conclusions
those results that are reported on the reactivity test report form
4 Safety precautions
4.1 Laboratory facilities
Many aerospace fluids are considered to be toxic chemicals. These chemicals shall only be opened and used
inside an approved laboratory hood.
4.2 Protective clothing
Personal protective clothing shall be worn by personnel when performing these tests. The minimum
protections required are 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. A
visual inspection shall be performed and any anomalies shall be noted. Table A.1 shows a suitable material
identification form.
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. Samples for the immersion test shall have a surface area of (250 ± 5) mm .
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.
2 © ISO 2006 – All rights reserved

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.
5.2.4 Test sample configuration
5.2.4.1 Sheets, film, and fabrics
Material being tested for chemical reactivity shall be cut in the form of a 100-mm square sample in the use
thickness (see Figure 1). To determine changes in the mechanical properties of a material, the sample shall
be cut in the form of a 100 mm by 150 mm rectangle (see Figure 1). For non-isotropic materials, the 100 mm
by 150 mm samples shall be cut from both the machine (warp) and transverse (fill) directions.
5.2.4.2 Adhesives and coatings
Adhesives and coatings shall be applied in a thickness equivalent to normal use on aluminium foil and cured,
if necessary, in accordance with the manufacturer's instructions.
Dimensions in millimetres
a) Reactivity/penetration test specimen b) Mechanical test specimen

c) Exothermic test specimen
Figure 1 — Test specimen dimensions
5.2.4.3 Tapes
Tapes shall be applied on aluminium foil, a watch glass or Petri dish in the as-received condition and
thickness.
5.2.4.4 Greases and gels
Greases and gels shall be applied on aluminium foil, watch glass or Petri dish in a thickness equivalent to
normal use. They shall be cured, if required, in accordance with the manufacturer's instructions.
5.2.4.5 Liquids
Liquids shall be tested by placing 1 ml in the bottom of a 20 ml glass laboratory beaker.
5.2.4.6 Non-standard configurations
Complex shapes such as O-rings, cables, pipes, shall be tested in a configuration consistent with the intended
use. Samples shall be cleaned as specified in 5.2.2.
5.3 Test methods
5.3.1 Reactivity test
5.3.1.1 General
This test is used to determine a possible material reaction and/or degradation when exposed to propellants or
other liquids of interest.
5.3.1.2 Test procedure
The test procedure shall be as follows.
a) Place a test specimen sample of the test material (see Figure 1) on a watch glass or in a Petri dish and
place a thermocouple in contact with the middle of the specimen. The thermocouple shall be jacketed
with glass or other inert material to minimize any reaction with the test fluid or the material being tested.
Since the evaporation of the test fluid can mask a reaction, a differential thermocouple scheme using one
thermocouple in contact with the sample and another thermocouple in contact with the test fluid may be
more definitive.
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 to prevent wicking.
c) Allow the test fluid to remain in contact with the sample for the specified exposure time. (The test
exposure time of the fluid on the test material shall be determined by the expected use-time of the
material.)
d) Add test fluid as required to maintain a liquid film on the test sample during the specified exposure time.
e) Carefully observe the test sample and thermocouple readout throughout the duration of the test.
f) At the end of the specified exposure time, carefully blot the liquid from the sample and rinse the sample
with running water for 60 s. Blotting and rinsing shall be performed with knowledge of the blotting material
compatibility of the test fluid. Rinsing shall be performed in accordance with the environmental regulations
governing disposal of the test fluid.
g) Allow the test sample to dry under flowing air or nitrogen for 24 h prior to final evaluation.
4 © ISO 2006 – All rights reserved

5.3.1.3 Report
The report shall consist of the following as a minimum (an example of a suitable form for reporting the results
of this test is shown in Table A.2):
a) name
...