ASTM D721-15 pdf download.Standard Test Method for Oil Content of Petroleum Waxes.
1.1 This test method covers the determination of oil in petroleum waxes having a congealing point of30 °C (86 °F) or higher as determined in accordance with Test Method D938, and containing not more than 15 % of oil. 2
N OTE 1—With some types of waxes, of oil contents greater than 5 %, there may be an incompatibility with MEK resulting in the formation of two liquid phases. If this occurs, the test method is not applicable to the material under test.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility ofregulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards: 3 D938 Test Method for Congealing Point of Petroleum Waxes, Including Petrolatum E1 Specification for ASTM Liquid-in-Glass Thermometers E128 Test Method for Maximum Pore Diameter and Perme- ability of Rigid Porous Filters for Laboratory Use
2.2 Energy Institute Standards: Specification for IP Standard Thermometers 4
3. Summary of Test Method
3.1 The sample is dissolved in methyl ethyl ketone, the solution cooled to –32 °C (–25 °F) to precipitate the wax, and filtered. The oil content of the filtrate is determined by evaporating the methyl ethyl ketone and weighing the residue.
4. Significance and Use
4.1 The oil content of a wax may have significant effects on several of its properties, such as strength, hardness, flexibility, scuffresistance, coefficient offriction, coefficient ofexpansion, melting point, and oil straining. The importance ofthese effects may be dependent upon the ultimate use of the wax.
5. Apparatus
5.1 Filter Stick and Assembly, consisting of a 10 mm diam- eter sintered glass filter stick of10 µm to 15 µm maximum pore diameter as determined by the method in Appendix X1, provided with an air pressure inlet tube and delivery nozzle. It is provided with a ground-glass joint to fit a 25 mm by 170 mm test tube. The dimensions for a suitable filtration assembly are shown in Fig. 1.
N OTE 2—A metallic filter stick may be employed if desired. A filter stick made of stainless steel and having a 12.7 mm ( 1 ⁄ 2 in.) disk of 10 µm to 15 µm maximum pore diameter, as determined by Test Method E128, has been found to be satisfactory.
The metallic apparatus is inserted into a 25 mm by 150 mm test tube and held in place by means of a cork.ASTM D721 pdf download.