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Use of reflectance spectra to predict heat buildup of pigmented PVC panels
Author(s) -
Sullivan T.,
Peake G.
Publication year - 1993
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730150410
Subject(s) - intensity (physics) , reflectivity , materials science , sample (material) , radiant intensity , pigment , composite material , analytical chemistry (journal) , optics , chemistry , chromatography , physics , organic chemistry , radiation
We present a method for predicting the heat buildup of pigmented PVC panels. Vinyl panels prepared for use in the ASTM D4803‐89 heat buildup test are scanned for percent reflectance from 200 to 2500 nm. For each sample an intensity factor is calculated according to:\documentclass{article}\pagestyle{empty}\begin{document}$$ IF \equiv \sum\limits_\lambda ^{2500} {\left( {1 - R_\lambda } \right)} L_\lambda , $$\end{document} where IF = intensity factor,R λ = fractional reflectance of the sample at 20 nm intervals, andL λ = relative intensity of the heat lamp at 20 nm intervals.A plot of the IF for each sample vs. its measured heat buildup (ASTM D4803‐89) for more than 50 sample panels containing a wide variety of pigments shows a linear relationship. Thus, the result in the ASTM D4803‐89 heat buildup test can be predicted based on the sample's reflectance spectrum and the intensity factor calculation. This method makes running the heat buildup test unnecessary and is very useful in evaluating pigments and pigmented systems for relative coolness.