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ASTM D1814 1970 Edition, April 13, 1970
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Standard Test Method for Measuring Thickness of Leather Units
Includes all amendments and changes through Reapproval Notice , 2015
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This test method covers the measurement of the thickness of units of all types of leather. It is not suitable for measuring the thickness of test specimens. 

The thickness of leather units may be reported in millimetres, ounces, or irons. Ounces are generally used when referring to the thickness of shoe upper leather. Irons are generally used when referring to the thickness of sole leather. (One ounce equals 164 in. or 0.0156 in. or 0.396 mm. One iron equals 1⁄48 in. or 0.0208 in. or 0.53 mm.) 

The values stated in inch-pound units are to be 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. 

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.