ASTM D3642-98(2004)

Standard Test Method for Softening Point of Certain Alkali-Soluble Resins

SIGNIFICANCE AND USE
In general, with materials of this type, softening does not take place at a definite temperature. As the temperature rises, these materials gradually and imperceptibly change from brittle solids to soft, viscous liquids. For this reason, the determination of the softening point must be made by a fixed, arbitrary, and closely defined methods if the results are to be comparable.
SCOPE
1.1 This test method covers the determination of the softening point of certain alkali-soluble resins having uniform plastic flow characteristics as the melting point is approached.
1.2 The resin manufacturer should specify whether or not this test method may be used for his product(s).
1.3 This test method is not suitable for styrene-maleic anhydride resins.
Note 1—For testing rosin and other resins, see Test Method E 28. For testing asphalts, tars, and pitches, see Test Method D 2398.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Aug-2004
• Technical Committee: D21 - Polishes
• Drafting Committee: D21.02 - Raw Materials

Relations

• Replaces: ASTM D3642-98 - Standard Test Method for Softening Point of Certain Alkali-Soluble Resins
• Effective Date: 01-Sep-2004
• Replaced By: ASTM D3642-98(2010) - Standard Test Method for Softening Point of Certain Alkali-Soluble Resins
• Effective Date: 01-May-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:D3642–98(Reapproved 2004)
Standard Test Method for
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Softening Point of Certain Alkali-Soluble Resins
This standard is issued under the fixed designation D3642; 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 rises, these materials gradually and imperceptibly change from
brittle solids to soft, viscous liquids. For this reason, the
1.1 This test method covers the determination of the soft-
determination of the softening point must be made by a fixed,
ening point of certain alkali-soluble resins having uniform
arbitrary, and closely defined methods if the results are to be
plastic flow characteristics as the melting point is approached.
comparable.
1.2 The resin manufacturer should specify whether or not
this test method may be used for his product(s).
5. Apparatus
1.3 This test method is not suitable for styrene-maleic
5.1 Ring—A brass-shouldered ring conforming to the di-
anhydride resins.
mensions shown in Fig. 1(a).
NOTE 1—For testing rosin and other resins, see Test Method . For 3
5.2 Ball—A steel ball, 9.53 mm ( ⁄8 in.) in diameter,
testing asphalts, tars, and pitches, see Test Method D2398.
weighing between 3.45 and 3.55 g.
1.4 This standard does not purport to address all of the
5.3 Ball-Centering Guide—A guide for centering the ball,
safety concerns, if any, associated with its use. It is the
constructed of brass and having the general shape and dimen-
responsibility of the user of this standard to establish appro-
sions illustrated in Fig. 1(c).
priate safety and health practices and determine the applica-
5.4 Container—Aglass vessel, capable of being heated, not
bility of regulatory limitations prior to use.
less than 85 mm (3.34 in.) in diameter and not less than 127
mm (5 in.) in depth from the bottom of the flare. (An 800-mL,
2. Referenced Documents
low-form Griffin beaker of heat-resistant glass meets this
2
2.1 ASTM Standards:
requirement.)
D2398 Discontinued 1985; Test Method for Softening
5.5 Support for Ring and Thermometer, as shown in Fig.
Point of Bitumen in Ethylene Glycol (Ring-and-Ball);
1(d). Note the following requirements:
3
Replaced by D 36
5.5.1 The ring shall be supported in a horizontal position.
E28 Test Methods for Softening Point of Resins Derived
5.5.2 The bottom of the ring shall be 25.4 mm (1 in.) above
from Naval Stores by Ring-and-Ball Apparatus
the horizontal plate below it.
5.5.3 The bottom surface of the horizontal plate shall be at
3. Terminology
least 12.5 mm (0.5 in.) and not more than 19 mm (0.75 in.)
3.1 Definition:
above the bottom of the beaker.
3.1.1 softening point—the temperature at which a disk of
5.5.4 The depth of liquid in the beaker shall be not less than
the sample held within a horizontal ring is forced downward a
102 mm (4 in.).
distance of 1 in. (25.4 mm) under the weight of a steel ball as
5.5.5 The thermometer shall be suspended so that the
the sample is heated at a prescribed rate in a glycerin bath.
bottom of the bulb is level with the bottom of the ring and
within 12.7 mm (0.5 in.) but not touching the ring.
4. Significance and Use
5.6 Thermometer—An ASTM High Softening Point Ther-
4.1 In general, with materials of this type, softening does
mometer, having a range from 30 to 200°C, and conforming to
not take place at a definite temperature. As the temperature
the requirements for Thermometer 16C as prescribed in Speci-
fication E28.
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5.7 Mechanical Stirrer—A variable-speed, motor-driven
This test method is under the jurisdiction ofASTM Committee D21 on Polishes
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
stirrer attached to the bottom of a true-vertical shaft must be
Current edition approved Sept. 1, 2004. Published September 2004. Originally
used to ensure uniform heat distribution. The stirrer shall be
approved in 1978. Last previous edition approved in 1998 as D3642 – 98. DOI:
positioned and its speed shall be regulated so that the fluid in
10.1520/D3642-98R04.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or the bath is completely but gently agitated, with no vortexing,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
turbulence, or air entrainment.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
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D3642–98 (2004)
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