Paraffins in petroleum wax according ASTM D5442

[Peter Apps]

Yes, this make sense.
But in this case if you don't use the internal standard, you cannot report your result as: According to ASTM D5442. To report a result like this, you must use the ISTD in your sample analysis.
In petroleum industry, if you don't follow the standard methods, your analysis is not valid to specify a product.

This is the kind of thing that makes me glad that I do not work in an acronym-driven QC lab

Peter

[Consumer Products Guy]

We dissolved our samples in hexadecane.