Standard Test Method for
Gel Time of Thermosetting Coating Powder1
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.
1. Scope *
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.
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 determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ISO Standards:
ISO 8130–6:1992 Coating powders—Part 6: Determination
of gel time of thermosetting coating powders at a given
temperature2
3. Terminology
3.1 Definitions:
3.1.1 coating powder, n—finely divided particles of resin,
either thermoplastic or thermosetting, generally incorporating
pigments, fillers, and additives and remaining finely divided
during storage under suitable conditions, which, after fusing
and possibly curing, give a continuous film.
3.1.2 cure time of a coating powder—the time required for
a thermosetting coating powder to sufficiently chemically
crosslink at a given temperature to provide the required coating
properties.
3.1.3 gel time of a coating powder— the interval required at
a given temperature for a coating powder to be transformed
from a dry solid to a gel-like state.
3.1.4 powder coating, n—coatings which are protective or
decorative, or both, formed by the application of a coating
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