ASTM D937 standard test method for cone penetration of petroleum
6. Apparatus
6.1 Penetrometer and Cone, as specified in Test Methods D217.
6.2 Oven, capable of maintaining a temperature of 82 more or less 2°C (180 more or less 5°F) for melting the petrolatum samples.
6.3 Water Bath, constant-temperature, regulated to 25 more or less 0.5°C (77 more or less 1°F).
6.4 Sample Containers, cylindrical, having a flat bottom 100 more or less 6 mm (4 more or less 1/4 in.) in diameter and 65 mm (2 1/2 in.) or more in depth, constructed of at least 1.6-mm (16-gage) metal and provided with a well fitting water-tight cover.
NOTE 1 - Containers of the "ointment box" type having somewhat flexible sides should not be used, for these permit slight working of the petrolatum, due to flexing of the sides in handling.
7. Preparation of Sample
7.1 Test all samples of petrolatum for original consistency after melting and cooling to the temperature of the test as described in 7.3.
7.2 If the penetration of the sample is over 200, three separate test samples are required.
7.3 Melt the sample in an oven maintained at 82 more or less 2°C (180 more or less 5°F) (see Note 2). Place the required number of sample containers in the oven along with the sample to bring them up to 82°C (180°F). When the sample has melted and comes to within 3°C (5°F) of the temperature, remove the sample and the heated containers and fill the required number of containers to within 6 mm (1/4 in.) of their rims. Allow the filled containers to cool in a location free from drafts and at a temperature controlled to 25 more or less 2°C (77 more or less 5°F) for 16 to 18 h. Then cover and place the samples in the water bath for 2 h to bring the temperature to 25 more or less 0.5°C (77 more or less 1°F) before testing.
NOTE 2 - Some petrolatums containing higher melting point waxes may require higher pouring temperatures.
