ASTM E28-18(2022)

Standard Test Methods for Softening Point of Resins Derived from Pine Chemicals and Hydrocarbons, by Ring-and-Ball Apparatus

SIGNIFICANCE AND USE
3.1 In general, with materials of these types, softening does not take place at a definite temperature. As the temperature rises, these materials gradually change from brittle or exceedingly thick and slow-flowing materials to softer and less viscous liquids. For this reason, the determination of the softening point must be made by a fixed, arbitrary, and closely defined method if the results obtained are to be comparable.  
3.2 In these test methods, the softening point is defined as the temperature at which a disk of the sample held within a horizontal ring is forced downward a distance of 25.4 mm (1 in.) under the weight of a steel ball as the sample is heated at 5 °C/min in a water, glycerin, silicone oil, ethylene glycol/water or glycerin/water bath.  
3.3 The automatic method was chosen to be the reference method because a round robin demonstrated that it gave more precise results than the manual method.
SCOPE
1.1 These test methods are intended for determining the softening point of resins (including rosin and terpene resins) and similar materials by means of the ring-and-ball apparatus.  
Note 1: For testing asphalts, tars, and pitches, see Test Method D36.  
1.1.1 Test method using the automated ring and ball softening point apparatus is the reference method and the test method using the manual ring and ball method is an alternative method.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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.

General Information

• Status: Published
• Publication Date: 30-Nov-2022
• ICS: 87.060.20 - Binders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.34 - Pine Chemicals and Hydrocarbon Resins

Standards Content (Sample)

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: E28 − 18 (Reapproved 2022)
Standard Test Methods for
Softening Point of Resins Derived from Pine Chemicals and
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Hydrocarbons, by Ring-and-Ball Apparatus
ThisstandardisissuedunderthefixeddesignationE28;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope ASTM Test Methods
E691Practice for Conducting an Interlaboratory Study to
1.1 These test methods are intended for determining the
Determine the Precision of a Test Method
softening point of resins (including rosin and terpene resins)
and similar materials by means of the ring-and-ball apparatus.
3. Significance and Use
NOTE 1—For testing asphalts, tars, and pitches, see Test Method D36.
3.1 In general, with materials of these types, softening does
1.1.1 Test method using the automated ring and ball soften- not take place at a definite temperature. As the temperature
ingpointapparatusisthereferencemethodandthetestmethod rises, these materials gradually change from brittle or exceed-
usingthemanualringandballmethodisanalternativemethod. ingly thick and slow-flowing materials to softer and less
viscous liquids. For this reason, the determination of the
1.2 The values stated in SI units are to be regarded as the
softening point must be made by a fixed, arbitrary, and closely
standard. The values given in parentheses are for information
defined method if the results obtained are to be comparable.
only.
3.2 In these test methods, the softening point is defined as
1.3 This standard does not purport to address all of the
the temperature at which a disk of the sample held within a
safety concerns, if any, associated with its use. It is the
horizontal ring is forced downward a distance of 25.4 mm
responsibility of the user of this standard to establish appro-
(1in.) under the weight of a steel ball as the sample is heated
priate safety, health, and environmental practices and deter-
at 5°C⁄min in a water, glycerin, silicone oil, ethylene glycol/
mine the applicability of regulatory limitations prior to use.
water or glycerin/water bath.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.3 The automatic method was chosen to be the reference
ization established in the Decision on Principles for the
method because a round robin demonstrated that it gave more
Development of International Standards, Guides and Recom-
precise results than the manual method.
mendations issued by the World Trade Organization Technical
4. Sample Preparation
Barriers to Trade (TBT) Committee.
4.1 Preparation of Sample by the Pour Method:
2. Referenced Documents
4.1.1 This procedure is suitable for materials that can be
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heated and poured without adverse effects on the softening
2.1 ASTM Standards:
point.
D36TestMethodforSofteningPointofBitumen(Ring-and-
4.1.2 Select a sample representative of the material to be
Ball Apparatus)
tested.Thesampleshouldconsistofflakes,pastilles,orfreshly
E1Specification for ASTM Liquid-in-Glass Thermometers
broken lumps free of oxidized surfaces. Avoid inclusion of
E177Practice for Use of the Terms Precision and Bias in
finely divided material or dust.
4.1.3 Selectaquantityatleasttwicethatnecessarytofillthe
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These test methods are under the jurisdiction of ASTM Committee D01 on desired number of rings, and melt it immediately in a clean
Paint and Related Coatings, Materials, and Applications and are the direct
container, using an oven, hot plate, sand bath or oil bath to
responsibility of Subcommittee D01.34 on Pine Chemicals and Hydrocarbon
prevent local overheating. Take care to avoid incorporating air
Resins.
bubbles in the sample. Melt the sample completely, but do not
Current edition approved Dec. 1, 2022. Published December 2022. Originally
approved in 1936. Last previous edition approved in 2018 as E28– 18. DOI:
heat it above a temperature necessary to pour the material
10.1520/E0028-18R22.
readily. The time from the beginning of heating to the pouring
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of the sample should not exceed 15 min.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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