Gene Mechtly wrote in USMA 8577:
> My personal opinion is that many of ASTM standards are rejected by
>the ISO because they are based on non-SI units, rather than because of
>differences in the adoption procedures of the ASTM (and ANSI) versus those
>of the ISO, as James would have us believe.
> For example, the R numbers in the U.S. for the thermal resistance
>of insulation materials are generated by thickness in inches and area in
>square feet, making U.S. R values not acceptable as ISO standards.
>There are many other examples of ASTM standards which are not based on SI,
>and which are, therefore, not acceptable to ISO member nations.
>
>Gene.
In Canada we use a metric version of R value, which we call RSI value. It
is square metre degree Celsius per watt (m2.�C/W). We call it thermal
insulance.
