For purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with Practice E29.

Property	Unit		Rounded Unit for Observed or Calculated Value
Chemical composition	percent
Hardness Knoop (100-g load unless other- wise specified) Vicker (specify load) Rockwell (all scales, specify which) Rockwell superficial (all scales, specify which)			nearest unit on the last right hand place of figure of specified limit
Resistivity	μΩ·cm
Tensile strength	psi (MPa)		nearest 1000 psi (nearest 10 MPa)
Yield Strength	psi (MPa)		nearest 1000 psi (nearest 10 MPa)
Elongation
Below 5 %	percent		nearest multiple of 0.5 %
5 % and over	percent		nearest 1 %
Grain size
Up to 0.055 mm incl.	mm		nearest multiple of 0.005 mm
Over 0.055 to 0.160, mm, incl.	mm		nearest 0.01 mm

1.1 This specification covers general requirements common to wrought precious metal electrical contact alloy products in the form of sheet, strip, wire, and rod. Unless otherwise specified in the purchase order or in an individual specification, these general requirements shall apply to wrought electrical contact materials where indicated in the applicable product specifications issued by ASTM.

1.2 In case of conflict, the requirements on the purchase order, the individual specification, and this general specification shall prevail in the sequence named.

1.3 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.

1.4 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.