ASTM B916-01 (R2021) pdf free download.Standard Test Method for Adherence of Porcelain Enamel Coatings to Sheet Metal.
1.1 The scope of this test method is:
1.1.1 To determine quantitatively the amount of enamel remaining after the porcelain enamel coating specimen has been deformed;
1.1.2 To standardize the deformation parameters for testing adherence of porcelain enamel to sheet metal; and,
1.1.3 To provide a quantitative adherence rating scale for comparison to reference standards.
1 .2 This adherence test method is applicable to porcelain enamel coatings on substrates from 18 to 24 gauge (0.0478 to 0.025 in. or from 1.2 14 to 0.654 mm).
1.3 The values stated in inch-pound units are to he regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1 .4 This standard does not purport to address all of the safety concerns, if an’, associated with its use. It is the responsibility of (lie user of this standard to establish appropriate saferi health, and environme,ital practices and determine the applicabihtv of regulatory limitations prior to use.
1 .5 This international standard as developed in accordance with in ternanonally recognized principles on standardiza (ion established in the Decision on Principles for the Development of Inwrnational Standards, Guides and Recom,nendaiions issued 1w the World Trade Organization Technical Barriers to Trade (TBT) committee.
2. Significance and Use
2.1 The measurement of adherence in porcelain enamel systems, such as ground coat, ground coatlcover coat, and direct-on cover-coat enamels, is an important procedure for monitoring process variables in metal preparation, enamel application thickness, steel selection, and enamel selection, as well as assuring the ultimate quality of the finished product.
3. Apparatus
3.1 Drop Weight Deformation Device2, see Figs. I and 2.
3.2 The drop weight deformation device as shown in Fig. 1 shall impart a single impact blow from a hemispherical indenter to a coated specimen supported over a sharp-edged bottom less die. The area of the deformation and the concomicant damage to the coating is largely influenced by the size of the hemispherical indenter: the die opening size and edge sharpness: and, the energy of the blow at impact.
3.3 A satisfactory degree of deformation and damage are obtained if the conditions in 3.2 use the following parameters:
0.50 in. (1 2.7 mm) diameter hemispherical indenter, 0.75 in. (19.1 mm) diameter bottomless die (lower plunger guide in
Fig. I) with sharp edge. and 80 in./lh (9.03) energy at impact.
3.4 Deformation Devices, of other designs may be used provided that the parameters in 3.3 are used.
3.5 Adherence Reference Standards, see 7.1.
4. Test Specimens
4.1 The test specimens shall the flat enameled panels not less in size than 4 in.2 (101.6 mm2). Larger sizes and shapes may be used provided that a flat surface can be held firmly against and parallel to the lower plunger guide during deformation.ASTM B916-01 pdf download.