ASTM D4890-18
- Standard Test Methods for Polyurethane Raw Materials: Determination of Gardner and APHA Color of Polyols
- standard by ASTM International, 08/01/2018
- Category: ASTM
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1.1 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 (see Note 1).
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