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ASTM D3642-98

(Test Method)

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

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

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 E28 . For testing asphalts, tars, and pitches, see Test Method D2398.
1.4 This standard does not purport to address all of the safety problems, 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
09-Sep-1998
ICS
83.080.10 - Thermosetting materials
Technical Committee
D21 - Polishes
Drafting Committee
D21.02 - Raw Materials
Current Stage
Ref Project

Relations

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

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ASTM D3642-98 - Standard Test Method for Softening Point of Certain Alkali-Soluble ResinsASTM D3642-98 - Standard Test Method for Softening Point of Certain Alkali-Soluble Resins
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ASTM D3642-98 - Standard Test Method for Softening Point of Certain Alkali-Soluble Resins
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 3642 – 98
Standard Test Method for
Softening Point of Certain Alkali-Soluble Resins
This standard is issued under the fixed designation D 3642; 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 (e) 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 E 28. For 3
5.2 Ball—A steel ball, 9.53 mm ( ⁄8 in.) in diameter,
testing asphalts, tars, and pitches, see Test Method D 2398.
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—A glass 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
2.1 ASTM Standards:
requirement.)
D 2398 Test Method for Softening Point of Bitumen in
5.5 Support for Ring and Thermometer, as shown in Fig.
Ethylene Glycol (Ring and Ball)
1(d). Note the following requirements:
E 1 Specification for ASTM Thermometers
5.5.1 The ring shall be supported in a horizontal position.
E 28 Test Method for Softening Point by Ring and Ball
5.5.2 The bottom of the ring shall be 25.4 mm (1 in.) above
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 E 1.
5.7 Mechanical Stirrer—A variable-speed, motor-driven
This test method is under the jurisdiction of ASTM Committee D-21 on
stirrer attached to the bottom of a true-vertical shaft must be
Polishes and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
Current edition approved Sept. 10, 1998. Published December 1998. Originally
used to ensure uniform heat distribution. The stirrer shall be
e1
published as D 3642 – 78. Last previous edition D 3642 – 83 (1993) .
positioned and its speed shall be regulated so that the fluid in
Annual Book of ASTM Standards, Vol 04.04.
3 the bath is completely but gently agitated, with no vortexing,
Annual Book of ASTM Standards, Vol 14.03.
turbulence, or air entrainment.
Annual Book of ASTM Standards, Vol 06.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 3642
F
...

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5.1 This method provides a simple means of characterizing the cure behavior of a thermosetting resin specimen that is a representation of a composite part. The diameter of the specimen is approximately 38 mm and the thickness ranges from 2.6 mm to 3.2 mm. This corresponds to a sample volume of approximately 3 cm3 to 4 cm3. The data may be used for quality control, research and development, and verifying the cure within processing equipment including autoclaves.  
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Note 1: It is recommended tha...
SCOPE
1.1 This method covers the use of dynamic mechanical instrumentation for determination and reporting of the thermal advancement of cure behavior of thermosetting resin on an inert filler or fiber in a laboratory. It may also be used for determining the cure properties of resins without fillers or fibers. These encapsulated specimens are deformed in torsional shear using dynamic mechanical methods.  
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