ISO 22538-3-2007 PDF

Full title and description

St ISO 22538-3-2007 — Space systems — Oxygen safety — Part 3: Selection of non‑metallic materials for oxygen systems and components. This standard gives guidance and a process for selecting non‑metallic (polymeric and other soft‑good) materials intended for use in gaseous and liquid oxygen systems, including requirements to reduce ignition and combustion risk in oxygen‑enriched environments.

Abstract

ISO 22538-3:2007 describes a materials‑selection process for non‑metallic components used in oxygen systems and their components. It applies to ground support equipment, launch vehicles and spacecraft and covers design considerations, test and acceptance criteria, batch/lot testing, and limitations for polymeric and other non‑metallic materials in LOX/GOX service.

General information

• Status: Published
• Publication date: September 2007
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 49.140 (Space systems)
• Edition / version: Edition 1 (2007)
• Number of pages: 11.

Scope

The standard establishes principles and practical guidance for selecting non‑metallic materials (seals, gaskets, valve seats, hoses, soft goods and similar components) for use in oxygen systems under gaseous and liquid oxygen conditions. It addresses environmental and operational factors (pressure, temperature, flow, cryogenic service), the need to minimize quantity and exposure of non‑metals, material cleaning and contamination control, batch testing and acceptance criteria, and the importance of evaluating materials in their intended configuration. The guidance is intended for design, qualification and procurement activities for spacecraft, launch vehicles and ground support equipment.

Key topics and requirements

• Material selection criteria: preference for materials with high auto‑ignition temperatures (AIT), low heat of combustion, high oxygen index, low burn rate and low flame temperature.
• Batch/lot testing and qualification: testing of representative production lots and establishing minimum acceptance criteria where material variability exists.
• Design and configuration considerations: minimizing exposed non‑metallic surface area, avoiding sharp geometries that promote ignition, and ensuring adequate mechanical properties at cryogenic temperatures.
• Cleaning, contamination control and handling: procedures to remove particulates and combustible contaminants without damaging material properties.
• Limitations and special cases: cautious application above the common experience range (noted guidance for pressures above ~20 MPa) and requirement for application‑specific testing where limited experience exists.
• Integration with hazard analysis and test programs: using materials testing together with system‑level hazard assessments to establish safe use.

Typical use and users

Used by aerospace and space‑system designers, propulsion and systems engineers, materials and polymer engineers, test and qualification laboratories, procurement and quality assurance teams, and safety/hazard analysts working on spacecraft, launch vehicles and ground support equipment where oxygen (liquid or gaseous) is present.

Related standards

Closely related to other parts of the ISO 22538 series (for oxygen safety) and to test and materials standards such as ISO 4589 (plastics — oxygen index), ISO 11114‑3 (autogenous ignition testing in oxygen) and commonly referenced test methods such as ASTM G86 (mechanical impact ignition sensitivity in liquid/pressurized oxygen). See the ISO 22538 series for complementary guidance on oxygen‑system safety.

Keywords

oxygen safety, LOX, GOX, non‑metallic materials, polymers, ignition, auto‑ignition temperature, oxygen index, batch testing, aerospace materials, cryogenic, seals, gaskets

FAQ

Q: What is this standard?

A: ISO 22538-3:2007 is an international standard that provides guidance and a selection process for non‑metallic materials intended for use in oxygen systems and components in space applications.

Q: What does it cover?

A: It covers material selection criteria, design and configuration considerations, batch/lot testing and acceptance criteria, cleaning and contamination control, limitations for high‑pressure or cryogenic service, and how materials testing should feed into system hazard analyses.

Q: Who typically uses it?

A: Aerospace designers and engineers, materials and polymer specialists, qualification/test laboratories, procurement and QA personnel, and safety/hazard analysts working on spacecraft, launch vehicles and ground support equipment where oxygen is used.

Q: Is it current or superseded?

A: The document is the first edition published in September 2007; the ISO record shows the 2007 edition was reviewed and confirmed (i.e., not withdrawn) in subsequent systematic reviews, so the 2007 edition remains the published version. Users should check the ISO catalogue or national standards body for any later revisions or amendments before relying on it.

Q: Is it part of a series?

A: Yes — ISO 22538 is a multi‑part series addressing oxygen safety for space systems; Part 3 specifically addresses selection of non‑metallic materials, and other parts cover related oxygen‑safety aspects.

Q: What are the key keywords?

A: Oxygen safety, LOX, GOX, non‑metallic materials, polymers, ignition sensitivity, auto‑ignition temperature, oxygen index, batch testing, aerospace.