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ASTM B708 2012 Edition, December 1, 2012
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Standard Specification for Tantalum and Tantalum Alloy Plate, Sheet, and Strip
Additional Comments: ALSO SEE ASTM B708 (R)
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This specification covers unalloyed and alloyed tantalum plate, sheet, and strip as follows. 

R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both, 

R05400, unalloyed tantalum, powder-metallurgy consolidation, 

R05255, tantalum alloy, 90 % tantalum, 10 % tungsten, electron-beam furnace of vacuum-arc melt, or both, 

R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tungsten, electron-beam furnace or vacuum-arc melt, or both, and 1.1.5 R05240, tantalum alloy, 60 % tantalum, 40 % niobium, electron-beam furnace or vacuum-arc melt.

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 and/or health problems, 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.