ASTM D3451:2006 (R2017) pdf free.Standard Guide for Testing Coating Powders and Powder Coatings. ASTM D3451 covers the determination of the acid material, which disassociates in distilled water, that is present in sulfur. The acidity is determined by an electrometric or visual titration. The values stated in SI units are to he regarded as the standard. The values given in parentheses...