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ASTM D3642-98(2010)

(Test Method)

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

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 . For testing asphalts, tars, and pitches, see Test Method .  
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
30-Apr-2010
ICS
83.080.10 - Thermosetting materials
Technical Committee
D21 - Polishes
Drafting Committee
D21.02 - Raw Materials
Current Stage
Ref Project

Relations

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

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ASTM D3642-98(2010) - Standard Test Method for Softening Point of Certain Alkali-Soluble ResinsASTM D3642-98(2010) - Standard Test Method for Softening Point of Certain Alkali-Soluble Resins
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ASTM D3642-98(2010) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D3642 − 98 (Reapproved2010)
Standard Test Method for
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 4. Significance and Use
1.1 This test method covers the determination of the soft-
4.1 In general, with materials of this type, softening does
ening point of certain alkali-soluble resins having uniform
not take place at a definite temperature. As the temperature
plastic flow characteristics as the melting point is approached.
rises, these materials gradually and imperceptibly change from
brittle solids to soft, viscous liquids. For this reason, the
1.2 The resin manufacturer should specify whether or not
determination of the softening point must be made by a fixed,
this test method may be used for his product(s).
arbitrary, and closely defined methods if the results are to be
1.3 This test method is not suitable for styrene-maleic
comparable.
anhydride resins.
NOTE 1—For testing rosin and other resins, see Test Method E28. For 5. Apparatus
testing asphalts, tars, and pitches, see Test Method D2398.
5.1 Ring—A brass-shouldered ring conforming to the di-
1.4 This standard does not purport to address all of the
mensions shown in Fig. 1(a).
safety concerns, if any, associated with its use. It is the
5.2 Ball—Asteel ball, 9.53 mm ( ⁄8 in.) in diameter, weigh-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- ing between 3.45 and 3.55 g.
bility of regulatory limitations prior to use.
5.3 Ball-Centering Guide—A guide for centering the ball,
constructed of brass and having the general shape and dimen-
2. Referenced Documents
sions illustrated in Fig. 1(c).
2.1 ASTM Standards:
5.4 Container—Aglass vessel, capable of being heated, not
D2398 Test Method for Softening Point of Bitumen in
3 less than 85 mm (3.34 in.) in diameter and not less than 127
Ethylene Glycol (Ring-and-Ball) (Withdrawn 1984)
mm (5 in.) in depth from the bottom of the flare. (An 800-mL,
E1 Specification for ASTM Liquid-in-Glass Thermometers
low-form Griffin beaker of heat-resistant glass meets this
E28 Test Methods for Softening Point of Resins Derived
requirement.)
from Naval Stores by Ring-and-Ball Apparatus
5.5 Support for Ring and Thermometer, as shown in Fig.
3. Terminology
1(d). Note the following requirements:
5.5.1 The ring shall be supported in a horizontal position.
3.1 Definitions:
3.1.1 softening point—thetemperatureatwhichadiskofthe
5.5.2 The bottom of the ring shall be 25.4 mm (1 in.) above
sample held within a horizontal ring is forced downward a the horizontal plate below it.
distance of 1 in. (25.4 mm) under the weight of a steel ball as
5.5.3 The bottom surface of the horizontal plate shall be at
the sample is heated at a prescribed rate in a glycerin bath.
least 12.5 mm (0.5 in.) and not more than 19 mm (0.75 in.)
above the bottom of the beaker.
5.5.4 The depth of liquid in the beaker shall be not less than
This test method is under the jurisdiction ofASTM Committee D21 on Polishes
102 mm (4 in.).
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
5.5.5 The thermometer shall be suspended so that the
Current edition approved May 1, 2010. Published May 2010. Originally
approved in 1978. Last previous edition approved in 2004 as D3642 – 98 (2004). bottom of the bulb is level with the bottom of the ring and
DOI: 10.1520/D3642-98R10.
within 12.7 mm (0.5 in.) but not touching the ring.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.6 Thermometer—An ASTM High Softening Point
Standards volume information, refer to the standard’s Document Summary page on
Thermometer, having a range from 30 to 200°C, and conform-
the ASTM website.
ing to the requirements for Thermometer 16C as prescribed in
The last approved version of this historical standard is referenced on
www.astm.org. Specification E1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3642 − 98 (Reapproved2010)
5.7 Mechanical Stirrer—A variable-speed, motor-driven
stirrer attached to the bottom of a true-vertical shaft must be
used to ensure uniform heat distribution. The stirrer shall be
D3642 − 98 (2010)
FI
...

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4.1 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.
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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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5.5 This method is valid for a wide range of oscillation frequencies typically from 0.002 Hz to 50 Hz.
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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