ASTM D721 Oil Content of Petroleum Waxes
Wax based lubricants can be shaped into sticks making them desirable for lubricating small parts such as bolts, brushes and chains. These lubricants are also attractive for use on porous materials that absorb oil, such as wood. To make the wax easier to spread, and to instill friction-reducing and corrosion-reducing properties, oil may be added to the wax. This test determines the amount of oil present in a wax-based lubricant.
The wax sample is melted and a solvent is added to dissolve the oil. The solvent-oil solution is separated from the wax using a filter stick, as per the method. The solvent is evaporated and the remaining oil weighed. The weight percent of oil in the wax is reported.