Abstract
This paper describes the National Voluntary Laboratory Accreditation Pro gram (NVLAP), administered by the National Bureau of Standards, and sum marizes the proficiency testing program for the Thermal Insulation Materials Laboratory Accreditation Program (Insulation LAP). NVLAP and its procedures for assessing, evaluating, and accrediting laboratories are presented briefly. The scope of the Insulation LAP is described. The results of the proficiency testing program over a four year period of testing are given. Eight tables show the sta tistical results of data submitted by participating laboratories for thermal trans mission properties, thermal conductance, surface flammability, settled density, critical radiant flux, and smoldering combustion.
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