ISO 23129-2021 PDF

Full title and description

Space systems — Thermal control coatings for spacecraft — Atomic oxygen protective coatings on polyimide film (ISO 23129:2021). This International Standard specifies general requirements and guidance for atomic‑oxygen (AO) protective coatings applied to polyimide thermal control films used on spacecraft, and it describes typical coating types, properties and selection considerations.

Abstract

ISO 23129:2021 defines general requirements for AO protective coatings on polyimide thermal control films. It describes coated‑film types (for example indium tin oxide (ITO), SiOx, germanium and silicone coatings), the properties of those coated films, relevant property measurement/test methods and guidance for selecting appropriate coatings for space applications.

General information

• Status: Published.
• Publication date: September 2021.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 (Space systems and operations).
• Edition / version: Edition 1 (2021).
• Number of pages: 19 pages.

(General information taken from the ISO catalogue entry for ISO 23129:2021.)

Scope

This standard applies to atomic oxygen protective coatings that are applied to polyimide thermal control films used on spacecraft exterior surfaces. It covers the identification of common coating materials (for example ITO, SiOx, germanium, silicone), the properties to be considered for coated polyimide films (optical/thermo‑optical, electrical where relevant, mechanical/adhesion and environmental resistance), measurement and test methods for those properties, and guidance on selecting coatings appropriate to mission environments and design requirements.

Key topics and requirements

• Definition of AO protective coating function and performance expectations for polyimide thermal control films.
• Typical coating types for AO protection on polyimide: indium tin oxide (ITO), silicon oxide (SiOx), germanium, silicone and similar thin films.
• Performance properties to specify and verify: atomic‑oxygen resistance, thermo‑optical properties (solar absorptance/emittance), optical reflectance, electrical conductivity (when applicable), adhesion and mechanical integrity.
• Recommended property measurement and test methods for coated films (bench and environmental testing relevant to space exposure).
• Selection guidance: matching coating material and thickness to mission AO fluence, thermal control needs and subsystem compatibility (e.g., electrical/optical requirements).
• Acceptance considerations and verification planning to ensure coating performance in the expected space environment.

Typical use and users

ISO 23129:2021 is intended for spacecraft thermal‑control designers and systems engineers, materials and surface‑treatment engineers, manufacturers and suppliers of coated polyimide films, test laboratories performing environmental and AO testing, and procurement/quality assurance teams responsible for specifying and verifying thermal control surfaces for satellites and other space vehicles.

Related standards

Standards and documents commonly used alongside or referenced for space coatings include ISO 16691 (general requirements for thermal control coatings for spacecraft), ISO 23230 (paints and varnishes — processes and requirements for coating materials and coatings for space systems), and ECSS coating/process standards such as ECSS‑Q‑ST‑70‑31C (application of paints on space hardware) and ECSS‑Q‑ST‑70‑17C (durability testing of coatings). These documents provide complementary general coating requirements, process and durability test guidance relevant to qualification and application of space coatings.

Keywords

atomic oxygen, AO protection, polyimide film, Kapton, thermal control coatings, ITO, SiOx, germanium coating, silicone coating, thermo‑optical properties, spacecraft surface coatings, coating test methods.

FAQ

Q: What is this standard?

A: ISO 23129:2021 is an ISO International Standard that specifies general requirements, property descriptions, test methods and selection guidance for atomic‑oxygen protective coatings applied to polyimide thermal control films used on spacecraft.

Q: What does it cover?

A: It covers coating types commonly used for AO protection of polyimide films (examples: ITO, SiOx, germanium, silicone), the important properties of coated films, measurement/test methods for those properties, and guidance for selecting coatings to meet mission environmental and thermal requirements.

Q: Who typically uses it?

A: Thermal control and systems engineers on spacecraft projects, materials and surface‑treatment engineers, suppliers of coated films, test laboratories, and procurement/quality assurance personnel specifying or verifying thermal control surfaces for space applications.

Q: Is it current or superseded?

A: ISO 23129:2021 is published as the first edition (2021). There is no ISO catalogue notice of a superseding edition as of the publication entry; users should check their national standards body or the ISO catalogue for any later amendments or replacements before procurement or qualification.

Q: Is it part of a series?

A: Yes — ISO 23129 sits with other ISO and ECSS documents addressing thermal‑control and coating requirements for space systems (for example ISO 16691 on general thermal control coatings and related ECSS Q‑ST‑70 family documents on application and testing of coatings). Projects commonly use ISO 23129 together with those broader coating/process and durability standards.

Q: What are the key keywords?

A: Atomic oxygen (AO) protection, polyimide film, thermal control coating, ITO, SiOx, germanium, silicone, thermo‑optical properties, coating test methods, spacecraft coatings.