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ASTM A309-01(2007)

Current Reaffirmation

Standard Test Method for Weight and Composition of Coating on Terne Sheet by the Triple-Spot Test (Withdrawn 2015)

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1.1 This test method covers the determination of the weight and composition of coating on terne sheet by the triple-spot method. The following three procedures are described:

1.1.1 Procedure A - Stripping with sulfuric acid.

1.1.2 Procedure D - Stripping with hydrochloric acid and antimony trichloride.

1.1.3 Procedure E - Stripping with hydrobromic acid-bromine solution.

Procedure B (Electrolytic Stripping) and Procedure C (Stripping with Silver Nitrate Solution), formerly in this test method, were discontinued because lack of usage. The designation for Procedure D and Procedure E are retained to avoid future confusion when reference is made only to the procedure designation.

1.2 If the percent of tin in the coating is required, stripping with hydrobromic acid-bromine is the preferred procedure. Steel with a predeposited electrolytic nickel coating requires a two-stage stripping method to determine total tin content. If both the tin and lead percentage are required, stripping with sulfuric acid is recommended, but caution is advised since the sulfuric acid procedure has been found to produce high tin results (see Section 11).

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 specific hazards statements, see Section 5, Note 2, and Section 17.


A coating of terne metal on iron or steel articles is intended to provide drawability, solderability, or corrosion resistance, or combination thereof, which can require different amounts of coating. Specifications for terne-coated sheets frequently provide for these different classes (weights) of coating so that purchasers can select that most suitable for their needs. This test method provides a means of determining the weight of coating for comparison with the material specification requirements.

SDO ASTM: ASTM International
Document Number A309
Publication Date May 1, 2007
Language en - English
Page Count 6
Revision Level 01(2007)
Supercedes
Committee A05.07
Publish Date Document Id Type View
Sept. 1, 2012 A0309-01R12 Revision
June 10, 2001 A0309-01 Revision
May 1, 2007 A0309-01R07 Reaffirmation
June 10, 2001 A0309-94AR99 Reaffirmation