ASTM D6166-97
Standard Test Method for Color of Naval Stores and Related Products (Instrumental Determination of Gardner Color)
standard by ASTM International, 08/10/1997
ASTM D1667-97
Standard Specification for Flexible Cellular Materials-Vinyl Chloride Polymers and Copolymers (Closed-Cell Foam)
standard by ASTM International, 07/10/1997