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1.1 This guide is a compilation of terms used to describe defects of polymeric pellets. Terms that are generally understood or defined adequately in readily available sources are not included.

1.2 Not every term is applicable to every type of pellet. Terms which apply to transparent pellets, for example, do not always apply to translucent or opaque pellets.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

4.1 This guide is intended to provide terminology for both suppliers and users of polymer pellets to ensure mutual understanding in discussions concerning pellet defects. It is not an absolute standard but is to be referred to when issues with the quality and/or description of the polymeric materials arise.

4.2 The guide is categorized according to the best fit for the term and its description for ease of finding certain description types.

4.3 Some terms within this guide do not apply to all resin types. It is the user’s responsibility to determine if the term and its subsequent definition are applicable to the material in question.

4.4 Other terminology relating to polymers that are not included in this document can be found in additional standards such as Terminology D883.

4.5 Test Method D6290 can be used for the instrumental measurement of discoloration in plastics, including pellets, and of the degree of yellowness (or change of degree of yellowness) under daylight illumination of homogeneous, nonfluorescent, nearly colorless transparent or nearly-white translucent or opaque plastics.