ASTM B916-01(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B916 − 01 (Reapproved 2021)
Standard Test Method for
Adherence of Porcelain Enamel Coatings to Sheet Metal
This standard is issued under the fixed designation B916; 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 (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The purpose of this test is to provide a standardized procedure to determine and rate the impact
adhesion of porcelain enamels on sheet steel.
1. Scope direct-on cover-coat enamels, is an important procedure for
monitoring process variables in metal preparation, enamel
1.1 The scope of this test method is:
application thickness, steel selection, and enamel selection, as
1.1.1 To determine quantitatively the amount of enamel
well as assuring the ultimate quality of the finished product.
remaining after the porcelain enamel coating specimen has
been deformed;
3. Apparatus
1.1.2 To standardize the deformation parameters for testing
adherence of porcelain enamel to sheet metal; and, 3.1 Drop Weight Deformation Device , see Figs. 1 and 2.
1.1.3 To provide a quantitative adherence rating scale for
3.2 The drop weight deformation device as shown in Fig. 1
comparison to reference standards.
shall impart a single impact blow from a hemispherical
1.2 This adherence test method is applicable to porcelain indenter to a coated specimen supported over a sharp-edged
enamel coatings on substrates from 18 to 24 gauge (0.0478 to
bottomless die. The area of the deformation and the concomi-
0.025 in. or from 1.214 to 0.654 mm). cant damage to the coating is largely influenced by the size of
the hemispherical indenter; the die opening size and edge
1.3 The values stated in inch-pound units are to be regarded
sharpness; and, the energy of the blow at impact.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only 3.3 A satisfactory degree of deformation and damage are
and are not considered standard. obtained if the conditions in 3.2 use the following parameters:
0.50 in. (12.7 mm) diameter hemispherical indenter, 0.75 in.
1.4 This standard does not purport to address all of the
(19.1 mm) diameter bottomless die (lower plunger guide in
safety concerns, if any, associated with its use. It is the
Fig. 1) with sharp edge, and 80 in./lb (9.03 J) energy at impact.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3.4 Deformation Devices, of other designs may be used
mine the applicability of regulatory limitations prior to use.
provided that the parameters in 3.3 are used.
1.5 This international standard was developed in accor-
3.5 Adherence Reference Standards, see 7.1.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Test Specimens
Development of International Standards, Guides and Recom-
4.1 The test specimens shall be flat enameled panels not less
mendations issued by the World Trade Organization Technical
2 2
in size than 4 in. (101.6 mm ). Larger sizes and shapes may be
Barriers to Trade (TBT) Committee.
used provided that a flat surface can be held firmly against and
parallel to the lower plunger guide during deformation.
2. Significance and Use
2.1 The measurement of adherence in porcelain enamel
5. Safety Precautions
systems, such as ground coat, ground coat/cover coat, and
5.1 During the procedure in 6.1, fine enameled chips may be
released with some force from the steel surface; therefore, it is
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
Current edition approved Oct. 1, 2021. Published November 2021. Originally A drop weight device that has been found suitable is available from Pacific
approvedin2001.Lastpreviouseditionapprovedin2017asB916 – 01(2017).DOI: Scientific Co., Gardner/Neotech Instrument Div., 2431 Linden Lane, Silver Spring,
10.1520/B0916-01R21. MD 20910.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
----------------
...