ECSS-Q-ST-70-54C – Ultracleaning of flight hardware (15 February 2017)


This standard addresses process descriptions, process validation, cleanliness control and monitoring, recontamination prevention, quality assurance as follows:


Process descriptions, including:

  • Detergent cleaning
  • Alcohol cleaning
  • Ultrapure water cleaning
  • Liquid boundary layer disruption cleaning
  • Multiple solvent cleaning (JPL procedure)
  • Vacuum bakeout
  • Supercritical fluids cleaning
  • Carbon dioxide snow cleaning
  • Plasma cleaning
  • Pyrolysis
  • Criteria for selecting other/novel processes


Process validation:

  • Test material selection
  • Preparation of test materials for process application
  • Deposition of contaminants
  • Description of test conditions
  • Verification of cleanliness level


Cleanliness control and monitoring, including:

  • Micro/nano imaging techniques
  • Spectrometry techniques
  • Spectroscopy techniques
  • Chromatography techniques


Recontamination prevention:

  • Packaging systems
  • Protective covers
  • Storage


Quality assurance

This standard may be tailored for the specific characteristic and constrains of a space project in conformance with ECSS-S-ST-00.



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