ISO 14624-3:2023 PDF

Space systems — Safety and compatibility of materials — Part 3: Determination of off-gassed compounds from materials and assembled articles

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Title (English):

ISO 14624-3:2023

Space systems — Safety and compatibility of materials — Part 3: Determination of off-gassed compounds from materials and assembled articles

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 14
Publication date:: October 10, 2023
Edition:: ISO IS 14624 edition 2 version 1
ICS:: 49.025.01

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Description (English):

This document specifies a method for determining the identity and quantity of volatile off-gassed compounds from materials and assembled articles utilized in manned, pressurized spacecraft.

Technical details

Technical committee: ISO/TC 20/SC 14 - Space systems and operations
SKU: ISO 14624-3:2023

Abstract

Overview

ISO 14624-3:2023 - Space systems: Determination of off-gassed compounds specifies a laboratory method to identify and quantify volatile compounds that evolve (off-gas) from materials and assembled articles intended for use in manned, pressurized spacecraft. The standard supports toxicological assessment by providing procedures to measure emissions, calculate a toxic hazard index (T), and derive safe usage limits such as maximum limit mass (MLM) or maximum limit article (MLA).

Key technical topics and requirements

Scope: Method for volatile off-gassed compounds from materials and assemblies in habitable spacecraft volumes.
Test atmosphere and pressure: Oxygen volume fraction ~ (20.9 ± 2) % with nitrogen/argon balance; test pressure within ±15 kPa of facility ambient. Specified impurity limits for compressed gases (e.g., CO 1 µl/l, CO2 3.0 µl/l, total hydrocarbons as methane 0.1 µl/l, halogenated compounds 0.5 µl/l, water 7.0 µl/l).
Thermal conditioning: Standard exposure of (72 ± 1) h at (50 ± 3) °C. High‑temperature‑sensitive materials have a normative alternative at 40 °C (Annex B).
Apparatus: Sample container, thermal chamber (±3 °C control, continuous recording), and analytical instrumentation.
Analytical methods: Recommended instruments include gas chromatography with flame ionization detector (GC‑FID), gas chromatography/mass spectrometry (GC‑MS), and infrared spectroscopy. Formaldehyde detection capability required at 0.1 µl/l (or current SMAC).
Sampling convention: Standard sample-mass-to-chamber-volume ratio is (5.0 ± 0.25) g/l; increase sample mass proportionally if detection limits exceed SMAC values (example provided for benzene).
Toxicity metrics: Calculate T (toxic hazard index) by summing ratios of projected compound concentrations to their spacecraft maximum allowable concentrations (SMAC). T must be

Related standards

Other ISO standards

Overview

Key technical topics and requirements

Scope: Method for volatile off-gassed compounds from materials and assemblies in habitable spacecraft volumes.
Test atmosphere and pressure: Oxygen volume fraction ~ (20.9 ± 2) % with nitrogen/argon balance; test pressure within ±15 kPa of facility ambient. Specified impurity limits for compressed gases (e.g., CO 1 µl/l, CO2 3.0 µl/l, total hydrocarbons as methane 0.1 µl/l, halogenated compounds 0.5 µl/l, water 7.0 µl/l).
Thermal conditioning: Standard exposure of (72 ± 1) h at (50 ± 3) °C. High‑temperature‑sensitive materials have a normative alternative at 40 °C (Annex B).
Apparatus: Sample container, thermal chamber (±3 °C control, continuous recording), and analytical instrumentation.
Analytical methods: Recommended instruments include gas chromatography with flame ionization detector (GC‑FID), gas chromatography/mass spectrometry (GC‑MS), and infrared spectroscopy. Formaldehyde detection capability required at 0.1 µl/l (or current SMAC).
Sampling convention: Standard sample-mass-to-chamber-volume ratio is (5.0 ± 0.25) g/l; increase sample mass proportionally if detection limits exceed SMAC values (example provided for benzene).
Toxicity metrics: Calculate T (toxic hazard index) by summing ratios of projected compound concentrations to their spacecraft maximum allowable concentrations (SMAC). T must be

ISO 14624-3:2023 PDF

Technical details

Abstract

Overview

Key technical topics and requirements

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Overview

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