Accession Number : ADA213324


Title :   Standard Method for Measurement of Nonvolatile Residue on Surfaces


Descriptive Note : Technical rept.,


Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS


Personal Author(s) : Borson, Eugene N ; Watts, Ethel J ; To, Gloria A


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a213324.pdf


Report Date : 10 Aug 1989


Pagination or Media Count : 49


Abstract : Contamination analyses are used to determine if material, components, and subsystems can be expected to meet the performance requirements of a system. Of particular concern is the quantity of molecular contaminants which might be deposited on critical payload surfaces from these sources. This would include all time periods from fabrication, through loading into the vehicle, launching, and during the lifetime of the spacecraft in orbit. A method for determining the mass of nonvolatile residue (NVR) was generated at The Aerospace Corporation by the authors, and the procedure was accepted by the ASTM as Standard E1235, in May 1988. The standard applies to the mass of NVR deposited on 1-sq-ft witness plates exposed in clean rooms, clean work areas, and clean enclosures. This report describes a wipe method for collecting molecular contaminants from any surface and procedures for gravimetric analysis of the NVR so obtained.


Descriptors :   *SPACECRAFT , *COMMAND AND CONTROL SYSTEMS , REQUIREMENTS , TIME INTERVALS , MOLECULES , LAUNCHING , CONTAMINANTS , CONTAMINATION , CLEAN ROOMS , LIFE SPAN(BIOLOGY) , GRAVIMETRIC ANALYSIS , STANDARDIZATION , SURFACES , QUANTITY , PERFORMANCE(ENGINEERING) , PAYLOAD


Subject Categories : Command, Control and Communications Systems


Distribution Statement : APPROVED FOR PUBLIC RELEASE