GB/T 34517-2017 in English

VALID

Evaluating method for spacecraft nonmetal materials outgassing in vacuum

Issued on:2017-11-01
Implemented on:2018-05-01
File Format:PDF
Delivery:Within 1 day

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Standard No:	GB/T 34517-2017
Document status:	VALID
Title in English:	Evaluating method for spacecraft nonmetal materials outgassing in vacuum
Title in Chinese:	航天器用非金属材料真空出气评价方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Within 1 day
Issued on:	2017-11-01
Implemented on:	2018-05-01
ICS Classification:	49.025.99-Other materials
Professional Classification:	GB-National Standard
Related Keywords:	vacuum outgassing vacuum unit spacecraft gb/t outgassing performance test vacuum maintenance technology
Related Topics:	non-metallic material metal material value air evaluation Lao Air Heavy Metals air heavy metals Instrument Evaluation Method Instrument Evaluation Method vacuum container material Nine non-metallic materials Application of non-metallic materials Spacecraft air heavy metals vacuum container material vacuum sample heavy metal air Three items of non-metallic materials GBT34517 GB/T 34517-2017 Metal vacuum quality Dissolution medium vacuum degassing method Fertilizer Heavy Metal Evaluation Methodological evaluation of colloidal gold method Tubeless tire material gb/t 34517-2017

《GB/T 34517-2017航天器用非金属材料真空出气评价方法》由TC425（全国宇航技术及其应用标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

1. Standard Background and Technical Evolution

GB/T 34517-2017 "Evaluation Method for Vacuum Outgassing of Non-metallic Materials for Spacecraft" aims to standardize the outgassing performance test of non-metallic materials for spacecraft in a vacuum environment. The standard was proposed by China Aerospace Science and Technology Corporation and managed by the National Technical Committee for Aerospace Technology and Its Application Standardization, ensuring its authority and applicability.

2. Comparison of standard frameworks

Standard dimensions	GB/T 34517—2017	Reference standards	Technological evolution
Scope of application	Evaluation of vacuum outgassing performance of non-metallic materials for spacecraft	GB/T 29085—2012 (Technical requirements for satellite anti-pollution)	Expanded to a wider range of spacecraft application environments
Core indicators	TML, CVCM, WVR	Outgassing related terms defined in GB/T 29085—2012	Added water vapor reabsorption (WVR) test
Test conditions	Vacuum degree better than $7\times10^{-3}$ Pa, temperature control accurate to ±1°C	General laboratory environment requirements	Optimized vacuum maintenance technology under high temperature

3. Recommendations for standard implementation

Case analysis: test system configuration and verification

Test device composition: Vacuum unit, temperature control unit and test unit. Key equipment includes: vacuum unit (oil-free design), analytical balance (sensitivity $1\times10^{-6}$ g) and constant temperature and humidity chamber.

System calibration requirements:The measuring instrument must be calibrated by the metrology department and within the validity period. The lower limit of the vacuum gauge is better than $1\times10^{-4}$ Pa, and the temperature control accuracy is ±1°C.

4. Data application and evaluation criteria

According to the standard:

Qualified judgment:TML ≤ 1.00%, CVCM ≤ 0.10%.
Unqualified judgment:TML > 1.00% or CVCM > 0.10%.
Error consideration: The test data needs to comprehensively consider the equipment accuracy and operation error.

More samples: GB 50021-2001(2009) QC/T 942-2021 YD/T 3934-2021

Sample only — not a preview of GB/T 34517-2017