ASTM D4242-91(1995)e1

Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders

SCOPE
1.1 This test method specifies a method for determining the flow characteristics of a fused thermosetting coating powder down a plane inclined at a set angle to the horizontal. The test gives an indication of the degree of melt flow that may occur during the curing of the coating powder. This characteristic contributes to the coherence of the coating, to its surface appearance and to the degree of coverage over sharp edges, however, it should not be used as the sole factor for judgment. The test acts as a useful method for checking for batch to batch variation in the behavior of a given coating powder. Correlation between the results from coating powders of differing composition is not to be expected. This method is unlikely to yield meaningful results with coating powders which have gel times of less than one minute at the test temperature (see Test Method D 4217.)
1.2 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 to determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Dec-2001
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.51 - Powder Coatings

Relations

• Referred By: ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
• Effective Date: 10-Dec-2001

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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.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.
e1
Designation: D 4242 – 91 (Reapproved 1995)
Standard Test Method for
Glass Plate Flow for Thermosetting Coating Powders
This standard is issued under the fixed designation D 4242; 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 4. Summary of Test Method
1.1 This test method measures the molten flow of thermo- 4.1 A pellet of specified size and weight is pressed from the
setting coating powders used for electrical insulation. test powder and placed upon a preheated glass plate in an oven.
1.2 This standard does not purport to address all of the The plate is kept in a horizontal position for a short time and
safety concerns, if any, associated with its use. It is the then tilted to a 60° angle from horizontal. After flow has
responsibility of the user of this standard to establish appro- stopped, the plate is removed from the oven, allowed to cool,
priate safety and health practices and to determine the and the distance of flow is measured.
applicability of regulatory limitations prior to use. A specific
5. Significance and Use
hazard statement is given in Section 7.
5.1 This test method is used to determine the molten flow of
2. Referenced Documents
coating powders when heated to specified elevated tempera-
2.1 ASTM Standards: tures. This test method determines flow characteristics under
D 618 Practice for Conditioning Plastics and Electrical minimal shear stress and without regard to time. This test
Insulating Materials for Testing method is useful for specification and quality-control purposes.
D 792 Test Methods for Specific Gravity (Relative Density)
2 6. Apparatus
and Density of Plastics by Displacement
6.1 Glass Plate, single-thickness clean glass microscope
D 1898 Practice for Sampling of Plastics
D 2436 Specification for Forced-Convection Laboratory slides 50 by 150 by 1 mm (2 by 6 by 0.040 in.).
6.2 Scale, calibrated in millimetres.
Ovens for Electrical Insulation
2.2 Other Document: 6.3 Oven, with forced convection capable of maintaining
135 to 176 6 1°C (275 to 3506 2°F) as described in
AISI C1018
Specification to D2436.
3. Terminology
6.4 Balance, accurate to 6 0.01 g.
3.1 Definition: 6.5 Stopwatch or Timer, accurate to 0.1 s.
3.1.1 coating powder, n—a heat-fusible, finely divided, 6.6 Pellet Mold, as shown in Fig. 1.
solid, resinous material used to form electrical insulating 6.7 Hydraulic Press, having a load capacity of 5 kN (1000
coatings. lbf) and a load indicator having an accuracy of 6 0.2 kN (6 40
3.1.1.1 Discussion—The coating powder may contain fill- lbf).
ers, colorants, curing agents, etc., consistent with producing the 6.8 Glass Plate Holder, as shown in Fig. 2.
desired coating. The powders are applied by various methods 6.9 Flexible Wire, about1m(1yd) long and about 0.35 mm
such as spraying, sprinkling, or dipping. Usually hot parts are (0.014 in.) in diameter for tripping the apparatus.
used. Heat causes the powder to melt and flow into a dense
7. Hazards
coating.
7.1 Warning—Provide adequate ventilation and avoid
breathing the dust or fumes and contact with the skin since
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
many of the reactive materials used in coating powders have
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.51 on Powder Coatings. been reported to be toxic or to cause irritation to sensitive skin.
Current edition approved July 15, 1991. Published September 1991. Originally
published as D 4242 – 83. Last previous edition D 4242 – 83(1987).
8. Sampling
Annual Book of ASTM Standards, Vol 08.01.
8.1 Sample in accordance with Method A of Practice
Annual Book of ASTM Standards, Vol 10.01.
Available from American Iron & Steel Inst., Box 311, Matawan, NJ 07747.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 4242
10. Conditioning
...