This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics. Buy ASTM D TEST METHOD FOR COLOR DETERMINATION OF PLASTIC PELLETS from SAI Global. Color Analysis Hunter Lab CIE Lab ASTM D ASTM E ASTM E

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Historical Version s – view previous versions of standard.

ASTM D – 18 Standard Test Method for Color Determination of Plastic Pellets

Work Item s – proposed revisions of this standard. Any test specimen preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then default conditions apply. d6920

Some materials, such as polyamide nyloncan be cooled very differently during the production of the pellets. This variation in the cooling of the pellets can result in different levels of crystallinity in the pellets only.


More crystalline nylons will be astj opaque than amorphous nylons.

Standard Test Method for Color Determination of Plastic Pellets

This will result in differences in pellet opacity. The pellet shape is independent of the crystallinity of the material. This variation in pellet awtm, due to varying levels of crystallinity, does not affect final properties.

This test method should not be used for general material specifications. The test method shall be used only to compare specimens of similar pellet shape, size, texture, and degree of translucency.

For example, compare translucent disc-shaped pellets to translucent disc-shaped pellets, not with opaque, rectangular shaped pellets.

Color measurements can be useful asttm comparing resins in pellet form when all samples are similar in shape and size. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter.

It aetm possible that each material will have unique characteristics that determine the color values. The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.


Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.