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ASTM D4640-86(2022)

(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, 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
31-May-2022
ICS
83.080.10 - Thermosetting materials
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.33 - Polymers and Resins
Current Stage
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ASTM D4640-86(2022) - Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde ResinsASTM D4640-86(2022) - Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
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ASTM D4640-86(2022) - Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
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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: D4640 − 86 (Reapproved 2022)
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, health, and environmental practices and deter- 6. Procedure
mine the applicability 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 a
...

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