Research Report RR:D20-1257
An interlaboratory study was conducted by six laboratories testing four different polyurethane materials to establish precision statements for D4890. Every "test result" represents an individual determination. Each laboratory reported three replicate test results for each material.
D4890-18 Standard Test Methods for Polyurethane Raw Materials: Determination of Gardner and APHA Color of Polyols
Committee D20 on Plastics
Subcommittee D20.22 on Cellular Materials - Plastics and Elastomers