ASTM D 4890 Standard Test Methods for Polyurethane Raw Materials: Determination of Gardner and APHA Color of Polyols

ASTM, 2013. — 5 p.These test methods measure visually the color of clear polyester and polyether liquids. They apply only to materials whose colors have light-absorption characteristics similar to those of the standards. An alternative method is Test Method D1209.
Units — The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.