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NASA RP 1124

4th Edition, June 1997

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OUTGASSING DATA FOR SELECTING SPACECRAFT MATERIALS



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Description / Abstract:

INTRODUCTION

This eleventh compilQtion of outgassing data of materials, intended for spacecraft use, supersedes Reference Publication 1124. Revision 3. September. 1993. The data were obtained at the Goddard Space Flight Center (GSFC), utilizing equipment developed at Stanford Research Institute (SR]) under contract to the Jct Propulsion Laboratory (JPL). The p&·esent publication contains new data in addition tn data from the previous reports. listed under References.

SRI personnel developed an apparatus for-determining the mass loss in vacuum and for collecting a portion of the outgassed products. Their report (Reference l ), which contained data from June 1964 to August 1967, served well as a foundation for selecting spacecraft materials with low outgassing properties. The app&ratus was duplicated at GSFC and, based on the SRI data and GSFC data, a GSFC report (Reference 2) was published. That repon included d&ta for those materials meeting two criteria: a maximum total mass Joss (TML) of 1.0 percent and a maximum collected volatile condensable materials (CVCM) of 0.10 percent.

After a series of tests and verificatjon of procedures. an Amedcan Society for Testing and Materials (ASTM) Standard Test Method was developed, based upon this apparatus. The method, "Total Mass Loss (TML) and Collected Volatile Condensable Materials (CVCM) from Outgassing in a Vacuum Environment." is identified as E 595-77/84/90. The data developed through the years have been reported in References 3-9, as a means of assisting in selecting materials for space flight use.