Currently C943 states 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. ASTM C09.68 Coordination states in Use of SI Units in C09 Standards added 7/9/2007 C09 combined standards should list SI units first followed by inch-pound units in brackets. C09 standards that currently have SI units as standard and inch-pound units for information should drop the informational units (see H18.104.22.168) or convert to a combined standard. Subcommittees need to decide whether inch-pound units are needed by users in the U.S. If the answer is yes, then a combined standard should be developed. There are C09 combined standards that do not require inch-pound equivalents of some values. For example, some of chemistry-based standards use volumes in L or mL, which are used for both the SI and inch-pound version. Therefore, the units statement in the scope should include an additional sentence shown below in underline: UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Some values have only SI units because the inch-pound equivalents are not used in practice. For those combined standards that have inch-pound units first, it will be necessary to ballot a new units statement if it does not conform to H22.214.171.124 and ballot that the order of the units will be reversed. It will not be necessary, however, to ballot specific reversal of units in the body of the standard, as these will be handled by the editor. Each subcommittee should examine all the SI values that are based on conversions of original inch-pound values and ensure that rationalized SI values are used. If changes are made to SI values, they should be balloted. It is proposed to remove the extraneous inch-pound units to be in accordance with the guidance from C09.68.
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