Standard Test Method for
Formability of Zinc-Rich Primer/Chromate Complex
Coatings on Steel1

This standard is issued under the fixed designation D 4146; 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 covers the evaluation of the formability
and adhesion of factory applied zinc-rich primer/chromate
complex coatings on steel with thicknesses of 0.65 to 1.25 mm
(0.025 to 0.05 in.) typical of those used in the coil coating
industry.

1.2 The degree of oil removal prior to forming, the techniques of taping, and differences in adhesive strength of the
tape can affect the adhesion rating.

1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.

1.4 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. For a specific
hazard statement, see Section 7.

2. Referenced Documents

2.1 ASTM Standards:
D 3330 Test Method for Peel Adhesion of PressureSensitive Tape 2

2.2 Other Document:
Pictorial Standards of Coating Defects3

3. Terminology

3.1 Definitions of Terms Specific to This Standard:

3.1.1 dome height—the height of the dome formed in the
test.

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