ASTM D4242-02
(Test Method)Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders
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
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Standards Content (Sample)
Designation: D 4242 – 02
Standard Test Method for
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Inclined 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.
1. Scope * 2.2 Other Documents:
ISO 8130-2 Coating powders—Part 2: Determination of
1.1 This test method specifies a method for determining the
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density by gas comparison pyknometer
flow characteristics of a fused thermosetting coating powder
ISO 8130-3 Coating powders—Part 3: Determination of
down a plane inclined at a set angle to the horizontal. The test
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density by liquid displacement pyknometer
gives an indication of the degree of melt flow that may occur
ISO 8130–11:1997 Coating powders—Part 11: Inclined-
during the curing of the coating powder. This characteristic
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plane flow test
contributes to the coherence of the coating, to its surface
appearance and to the degree of coverage over sharp edges (see
3. Terminology
Test Method D 2967), however, it should not be used as the
3.1 Definitions:
sole factor for judgment. The test acts as a useful method for
3.1.1 coating powder, n—finely divided particles of resin,
checking for batch to batch variation in the behavior of a given
either thermoplastic or thermosetting, generally incorporating
coating powder. Correlation between the results from coating
pigments, fillers, and additives and remaining finely divided
powders of differing composition is not to be expected. This
during storage under suitable conditions, which after fusing
method is unlikely to yield meaningful results with coating
and possibly curing, give a continuous film.
powders which have gel times of less than one minute at the
3.1.2 powder coating, n—coatings which are protective or
test temperature (see Test Method D 4217). Oven drafts, angle
decorative, or both, formed by the application of a coating
of inclination and pellet variations significantly affect results
powder to a substrate and fused in a continuous film by the
making inter-lab reproducibility somewhat difficult to corre-
application of heat or radiant energy.
late.
3.1.3 gel time of a coating powder—the interval required at
1.2 The values stated in SI units are to be regarded as the
a given temperature for a coating powder to be transformed
standard. The values given in parentheses are for information
from a dry solid to a gel-like state.
only.
3.1.4 cure time of a coating powder—the time required for
1.3 This standard does not purport to address all of the
a thermosetting coating powder to sufficiently chemically
safety concerns, if any, associated with its use. It is the
crosslink at a given temperature to provide the required coating
responsibility of the user of this standard to establish appro-
properties.
priate safety and health practices and to determine the
3.1.5 thermosetting, adj—describing a material that, when
applicability of regulatory limitations prior to use.
heated per a minimum recommended cure condition, under-
2. Referenced Documents goes a chemical reaction and a permanent change to a more
durable state capable of specific properties as designed for
2.1 ASTM Standards:
substrate protection or decoration, or both.
D 792 Test Methods for Density and Specific Gravity (Rela-
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tive Density) of Plastics by Displacement
4. Summary of Test Method
D 2967 Test Method for Edge Coverage of Powder Coat-
3 4.1 The thermosetting coating powder is pressed into a
ings
pellet of standard size which is allowed to melt and flow down
D 4217 Test Method for Gel Time of Thermosetting Coat-
3 a heated inclined plate. The extent of flow is measured.
ing Powder
D 5965 Test Methods for Specific Gravity of Coating Pow-
5. Significance and Use
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ders
5.1 This test method is useful for selecting coating powders
of similar characteristics of melt flow under minimal shear. It
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
is not recommended as an absolute measurement, but rather as
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.51 on Powder Coatings.
a comparative measurement of samples on the same panel
Current edition approved July 10, 2002. Published September 2002. Originally
published as D 4242 – 83. Last previous edition D 4242 – 01.
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Annual Book of ASTM Standards, Vol 08.01. Available from International Organization for Standards (ISO), 1 Rue de
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Annual Book of ASTM Standards, Vol 06.02. Varembé, Case Postale 56, CH-1211, Geneva 20, Switzerland.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 4242
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