ASTM D6605-06(2020)

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.
Designation: D6605 − 06 (Reapproved 2020)
Standard Practice for
Determining the Color Stability of Hydrocarbon Resins After
Heating
This standard is issued under the fixed designation D6605; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This practice covers determination of the color stability 3.1 Definitions:
of a hydrocarbon resin by exposure to a specific temperature
3.1.1 Fordefinitionsoftermsrelatingtohydrocarbonresins,
for a defined time period in a forced-draft oven.
see Terminology D6440.
1.2 Color stability is measured by the change in color of the
4. Summary of Practice
test resin, measured via the yellowness index color scale, in
accordance with Practice E313, or the procedure for Gardner
4.1 Specimens of the hydrocarbon resin(s) to be tested are
Color, Test Method D6166.
placed in 250-mL (8-oz) glass jars, which are placed in a
heating block that is in a ventilated oven set at 175°C. The
1.3 The values stated in SI units are to be regarded as
standard. The values given in parentheses are for information 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.
only.
After cooling, the samples are dissolved in toluene. The color
1.4 This standard does not purport to address all of the
of each aged resin solution is measured and compared to that
safety concerns, if any, associated with its use. It is the
of a solution of the corresponding unaged resin. This color
responsibility of the user of this standard to establish appro-
increase is a measure of the (lack of) stability of the resin.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5.1 This practice is useful for both quality control and
ization established in the Decision on Principles for the
research.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6. Apparatus and Materials
Barriers to Trade (TBT) Committee.
6.1 Forced Draft Oven, with the ventilation set at maximum
capacity.
2. Referenced Documents
6.2 Aluminum Block, equipped with a control thermocouple
2.1 ASTM Standards:
(see Fig. 1).
D6166 Test Method for Color of Pine Chemicals and Re-
lated Products (Instrumental Determination of Gardner
6.3 Temperature Indicator.
Color)
6.4 Glass Jars, 250 mL (8 oz), with suitably lined screw
D6440 Terminology Relating to Hydrocarbon Resins
cap.
E313 Practice for Calculating Yellowness and Whiteness
Indices from Instrumentally Measured Color Coordinates
NOTE 1—TFE-fluorocarbon-lined caps work well.
6.5 Balance, readable to at least 0.1g.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
6.6 Shaker, used to facilitate the dissolution of the resin
Related Coatings, Materials, and Applications and is the direct responsibility of
specimens.
Subcommittee D01.34 on Pine Chemicals and Hydrocarbon Resins.
CurrenteditionapprovedJune1,2020.PublishedJuly2020.Originallyapproved
6.7 Spectrophotometer or Tristimulus Colorimeter.
in 2000. Last previous edition approved in 2015 as D6605 – 06 (2015). DOI:
10.1520/D6605-06R20.
7. Reagents
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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