ASTM D4640-86(2017)
(Test Method)Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
SIGNIFICANCE AND USE
4.1 This method is significant as a process control for polymerization time.
4.2 When the cure times are determined at several temperatures and plotted as time versus temperature, different resins can be compared for curing characteristics.
SCOPE
1.1 This test method covers the determination of the cure rate at any specified temperature for a thermosetting phenol-formaldehyde resin. The time at that temperature required to make a fluid mixture change into a hard immovable mass indicates speed of cure.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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 and health 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.
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Designation: D4640 − 86 (Reapproved 2017)
Standard Test Method for
Determining Stroke Cure Time of Thermosetting Phenol-
Formaldehyde Resins
This standard is issued under the fixed designation D4640; 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 4.2 When the cure times are determined at several tempera-
tures and plotted as time versus temperature, different resins
1.1 This test method covers the determination of the cure
can be compared for curing characteristics.
rate at any specified temperature for a thermosetting phenol-
formaldehyde resin. The time at that temperature required to
5. Apparatus
make a fluid mixture change into a hard immovable mass
indicates speed of cure.
5.1 Electric Hot Cure Plate, with a smooth surface free of
rough spots with adjustable control to hold the temperature
1.2 The values stated in inch-pound units are to be regarded
within 3.5°F (2°C) (Note 1).
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only 7
5.2 Spatula,3by ⁄16 in. (75 by 10 mm), stainless.
and are not considered standard.
5.3 Stopwatch.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.4 Knife, brass, putty with straight edge.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 6. Procedure
bility of regulatory limitations prior to use.
6.1 Adjust the hot plate to the desired test temperature.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- NOTE 1—Usual temperatures are 300°F (150°C), 320°F (160°C), and
330°F (165°C).
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
6.2 Place an approximately 0.5-g specimen on the hot plate
2 2
mendations issued by the World Trade Organization Technical
and spread over an approximately 2-in. (130-mm ) area with
Barriers to Trade (TBT) Committee.
a clean spatula as quickly as possible. Start the stopwatch
immediately upon adding the specimen to the hot plate, then
2. Terminology
stroke steadily across the specimen in alternating smoothing
2.1 Definitions of Terms Specific to This Standard:
and patting motions.
2.1.1 stroke cure time, n—the time required for a resin being
6.3 As the resin approaches the cured stage, it becomes
held at a specified temperature on a hot plate and being stroked
more viscous and stringy. Stop the stopwatch when the resin on
with a spatula, to adhere to the hot plate and not to the spatula.
the hot plate and the spatula no longer adhere to each other.
3. Summary of Test Method
Record the elapsed time
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4640 − 86 (Reapproved 2009) D4640 − 86 (Reapproved 2017)
Standard Test Method for
Determining Stroke Cure Time of Thermosetting Phenol-
Formaldehyde Resins
This standard is issued under the fixed designation D4640; 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
1.1 This test method covers the determination of the cure rate at any specified temperature for a thermosetting phenol-
formaldehyde resin. The time at that temperature required to make a fluid mixture change into a hard immovable mass indicates
speed of cure.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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 and health 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.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 stroke cure time, n—the time required for a resin being held at a specified temperature on a hot plate and being stroked
with a spatula, to adhere to the hot plate and not to the spatula.
3. Summary of Test Method
3.1 This test method employs the use of controlled heat and a thin layer of resin to determine the time in seconds required to
change from a fluid stage to a cured immovable stage.
4. Significance and Use
4.1 This method is significant as a process control for polymerization time.
4.2 When the cure times are determined at several temperatures and plotted as time versus temperature, different resins can be
compared for curing characteristics.
5. Apparatus
5.1 Electric Hot Cure Plate, with a smooth surface free of rough spots with adjustable control to hold the temperature within
3.5°F (2°C) (Note 1).
5.2 Spatula, 3 by ⁄16 in. (75 by 10 mm), stainless.
5.3 Stopwatch.
5.4 Knife, brass, putty with straight edge.
6. Procedure
6.1 Adjust the hot plate to the desired test temperature.
NOTE 1—Usual temperatures are 300°F (150°C), 320°F (160°C), and 330°F (165°C).
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the di
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