ASTM D6605-06 (2020) pdf free.Standard Practice for Determining the Color Stability of Hydrocarbon Resins After Heating.
1.1 This practice covers determination of the color stability of a hydrocarbon resin by exposure to a specific temperature for a defined time period in a forced-draft oven.
1.2 Color stability is measured by the change in color of the test resin, measured via the yellowness index color scale, in accordance with Practice E313, or the procedure for Gardner Color, Test Method D6166.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safery 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.
1.5 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 Recom mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Commitee.
3.1.1 For definitions of terms relating to hydrocarbon resins,
see Terminology D6440.
4. Specimens of the hydrocarbon resin(s) to be tested are placed in 250-mL (8-0z) glass jars, which are placed in a heating block that is in a ventilated oven set at 175%C. The samples are kept in the oven for an agreed upon period. At the end of this time, the samples are removed and allowed to cool. After cooling, the samples are dissolved in toluene. The color
of each aged resin solution is measured and compared to that of a solution of the corresponding unaged resin. This color increase is a measure of the (lack of) stability of the resin.
5. This practice is useful for both quality control and research.ASTM D6605 pdf download.