ASTM D612 Standard Test Method for Carbonizable Substances in Paraffin Wax
3. Summary of Test Method
3.1 Five millilitres of melted wax are treated with 5 mL of concentrated, nitrogen-free sulfuric acid at 158°F (70°C). The color of the acid layer is compared with that of a colorimetric reference standard. If the color is not darker than the standard, the wax is reported as passing the test.
4. Significance and Use
4.1 This test method is a means for ascertaining whether pharmaceutical paraffin wax conforms to the standards for quality prescribed by the U.S. National Formulary.
