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ASTM D4217-91(1995)e1

(Test Method)

Standard Test Method for Gel Time of Thermosetting Coating Powder

Standard Test Method for Gel Time of Thermosetting Coating Powder

SCOPE
1.1 This test method determines the length of time a thermosetting coating powder remains liquified at a specified elevated temperature. The method provides a means for estimating thermal gel time of coatings. This test method is intended for gel times of less than 90 s.  
1.2 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. A specific hazard statement is given in Section 8.

General Information

Status
Historical
Publication Date
31-Dec-1994
ICS
83.080.10 - Thermosetting materials
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.51 - Powder Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM D4217-02 - Standard Test Method for Gel Time of Thermosetting Coating Powder
Effective Date
10-Jul-2002

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ASTM D4217-91(1995)e1 - Standard Test Method for Gel Time of Thermosetting Coating PowderASTM D4217-91(1995)e1 - Standard Test Method for Gel Time of Thermosetting Coating Powder
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ASTM D4217-91(1995)e1 - Standard Test Method for Gel Time of Thermosetting Coating Powder
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Standards Content (Sample)


e1
Designation: D 4217 – 91 (Reapproved 1995)
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
Gel Time of Thermosetting Coating Powder
This standard is issued under the fixed designation D 4217; 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.
e NOTE—Editorial changes were made throughout in November 1995.
1. Scope 5. Apparatus
1.1 This test method determines the length of time a 5.1 Hot Plate, having a 10 mm ( ⁄8 in.) thick metal surface
thermosetting coating powder remains liquified at a specified capable of maintaining temperatures of 150–250°C
elevated temperature. The test method provides a means for (300–480°F) within 61°C (62°F) of set point.
estimating thermal gel time of coatings. This test method is 5.2 Stopwatch or Timer, accurate to 0.1 s.
intended for gel times of less than 90 s. 5.3 Wood Stirrer, with approximate dimensions of 2 by 6 by
1 1
1.2 This standard does not purport to address all of the 130 mm or ( ⁄16 by ⁄4 by 5 in.).
safety concerns, if any, associated with its use. It is the 5.4 Surface Pyrometer, suitable for use at 150–250°C
responsibility of the user of this standard to establish appro- (300–480°F).
priate safety and health practices and determine the applica- 5.5 Measuring Spoon, of 1.25 cc ( ⁄4 tsp) capacity.
bility of regulatory limitations prior to use. A specific hazard 5.6 Mold Release Agent.
statement is given in Section 8. 5.7 Brass Die Scraper, or suitable substitute.
2. Referenced Documents 6. Selection of Specimens
2.1 ASTM Standards: 6.1 Sample in accordance with Method A of Practice
D 1898 Practice for Sampling of Plastics D 1898 from one lot of coating powder.
6.2 Store the sample of coating powder in an airtight sealed
3. Terminology
container prior to testing.
3.1 Definitions: 6.3 A specimen shall consist of approximately 1.25 cm ( ⁄4
3.1.1 coating powder, n—a heat fusible, finely divided,
tsp) of powdered resin taken from the airtight container.
solid, resinous material used to form electrical insulating
7. Calibration
coatings.
3.1.1.1 Discussion—The coating powder may contain fill- 7.1 Place the hot plate in a draft-free location or use a
ers, colorants, curing agents, etc., consistent with producing the three-sided draft shield constructed to eliminate drafts.
desired coating. The powder is applied by various methods 7.2 Allow a minimum of 30 min for the hot plate to reach
such as spraying, sprinkling, or dipping. Usually hot parts are the temperature at which calibration is made.
used. Heat causes the powder to melt and flow into a dense 7.3 Calibrate the hot plate with the surface pyrometer at 204
coating. 6 1°C (400 6 2°F) or at a temperature as agreed between
3.1.2 gel time, n—of powder coating, the time required at a buyer and seller.
specified temperature for a coating powder to be transformed 7.4 Coat the plate with a thin coat of mold release. Wipe off
into a fused, nonflowable mass. excess with a clean towel.
4. Significance and Use 8. Procedure
4.1 This test method is useful for selecting coating powders 8.1 Warning—Provide adequate venti
...

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4.1 This test method is useful for selecting coating powders that gel in the desired time at the specified temperature. The method is not useful for determination of cure time.
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1.1 This test method determines the length of time a thermosetting coating powder takes to gel on a polished metal surface at a specified temperature, such as 204°C (400°F). The determination of the gel time is a very simple method for the characterization and quality control of coating powders. However, the gel time determined by this method is not directly related to the time for the coating powder to cure in practical applications.  
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