ASTM D4640-86(1996)

Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins

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  This standard does not purport to address all of the safety problems 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: 27-Nov-1986
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.33 - Polymers and Resins

Relations

• Replaced By: ASTM D4640-86(2001) - Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
• Effective Date: 28-Nov-1986

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4640 – 86 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Determining Stroke Cure Time of Thermosetting Phenol-
Formaldehyde Resins
This standard is issued under the fixed designation D 4640; 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 5.3 Stopwatch.
5.4 Knife, brass, putty with straight edge.
1.1 This test method covers the determination of the cure
rate at any specified temperature for a thermosetting phenol-
6. Procedure
formaldehyde resin. The time at that temperature required to
6.1 Adjust the hot plate to the desired test temperature.
make a fluid mixture change into a hard immovable mass
indicates speed of cure.
NOTE 1—Usual temperatures are 300°F (150°C), 320°F (160°C), and
1.2 This standard does not purport to address all of the 330°F (165°C).
safety concerns, if any, associated with its use. It is the
6.2 Place an approximately 0.5-g specimen on the hot plate
2 2
responsibility of the user of this standard to establish appro-
and spread over an approximately 2-in. (130-mm ) area with
priate safety and health practices and determine the applica-
a clean spatula as quickly as possible. Start the stopwatch
bility of regulatory limitations prior to use.
immediately upon adding the specimen to the hot plate, then
stroke steadily across the specimen in alternating smoothing
2. Terminology
and patting motions.
2.1 Definitions of Terms Specific to This Standard:
6.3 As the resin approaches the cured stage, it becomes
2.1.1 stroke cure time—the time required for a resin being
more viscous and stringy. Stop the stopwatch when the resin on
held at a specified temperature on a hot plate and being stroked
the hot plate and the spatula no longer adhere to each other.
with a spatula, to adhere to the hot plate and not to the spatula.
Record the elapsed time.
6.4 Remove cured resin from hot plate immediately with the
3. Summary of Test Method
straight edged putty knife.
3.1 This test method employs the use of controlled heat and
NOTE 2—The longer on the hot plate, the harder it i
...