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Proceedings Paper

Maintaining a Class M 5.5 environment in a Class M 6.5 cleanroom
Author(s): David W. Hughes; Randy J. Hedgeland; Wayne C. Geer; Barry N. Greenberg
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Paper Abstract

During Kennedy Space Center processing of the Hubble Space Telescope First Servicing Mission, critical optical components were integrated in a Class 100,000 (M 6.5 at 0.5 micrometers and 5.0 micrometers , per Fed-Std 209E) cleanroom. A Class 10,000 (M 5.5) environment was mandated by the 400B (per Mil-Std 1246B) surface cleanliness requirement of the Scientific Instruments. To maintain a Class M 5.5 environment, a contamination control plan was implemented which addressed personnel constraints, operations, and site management. This plan limited personnel access, imposed strict gowning requirements, and increased cleanroom janitorial operations, prohibited operations known to generate contamination while sensitive hardware was exposed to the environment, and controlled roadwork, insecticide spraying, and similar activities. Facility preparations included a ceiling to floor cleaning, sealing of vents and doors, and revising the garment change room entry patterns. The cleanroom was successfully run below Class 5000 while the instruments were present; certain operations, however, were observed to cause local contamination levels to increase above Class M 5.5.

Paper Details

Date Published: 19 October 1994
PDF: 12 pages
Proc. SPIE 2261, Optical System Contamination: Effects, Measurements, and Control IV, (19 October 1994); doi: 10.1117/12.190157
Show Author Affiliations
David W. Hughes, Swales and Associates, Inc. (United States)
Randy J. Hedgeland, NASA Goddard Space Flight Ctr. (United States)
Wayne C. Geer, NSI Technology Services (United States)
Barry N. Greenberg, NSI Technology Services (United States)

Published in SPIE Proceedings Vol. 2261:
Optical System Contamination: Effects, Measurements, and Control IV
A. Peter M. Glassford, Editor(s)

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