Accession Number : ADP000578

Title :   Suspension Light Absorption Measurement of Weatherable PVC Compounds,


Personal Author(s) : Warren,Paul C.

Report Date : NOV 1982

Pagination or Media Count : 5

Abstract : A rapid and reproducible method to measure the effective carbon black concentration in weatherable vinyl compositions has been developed. Instead of the usual difficult preparation and manipulation of a thin film of plastic, the compound is simply dissolved in tetrahydrofuran before making the traditional light absorption measurement. The black particles remain in suspension and absorb light just as if they were immobilized in a polymer matrix. The test accurately identifies carbon black that is too large a particle size, poorly dispersed, too low a concentration, etc., all of which detract from the UV resistance of finished product. The only compounds that are incompatible with the new technique are those that are insoluble or those that contain significant amounts of inorganic materials that scatter rather than absorb light. (Author)

Descriptors :   *Fiber optics transmission lines, *Electric cables, *Electric wire, *Symposia, *Polyvinyl chloride, Absorption spectra, Measurement, Weather, Resistance, Ultraviolet spectra, Light sources, International

Distribution Statement : APPROVED FOR PUBLIC RELEASE