ASTM D243 standard test method for residue of specified penetration
5. Apparatus
5.1 The apparatus shall consist of a container, heating bath, hot plate, and thermometer, with necessary accessory apparatus as follows:
5.1.1 Container - The container in which the sample is to be tested shall be a flat-bottom, cylindrical seamless tin box, 70 mm in diameter and 45 mm in depth.
NOTE 1 - Containers known in the pharmaceutical industry as seamless "ointment boxes" may be obtained in dimensions conforming to the above requirements.
5.1.2 Heating Bath - The heating bath shall be a cast-iron air bath, or equivalent, permitting the immersion of the container to a depth of 32 +/- 5 mm through an opening 3 +/- 2 mm larger in diameter than the container. It shall support the container 6 +/- 2 mm above the hot plate, and with at least 6.4 mm free air space between the sides of the container and of the air bath below the opening. A suitable air bath is shown in Fig. 1.
5.1.3 Hot Plate - The air bath shall be heated upon a suitably mounted hot plate, heated either electrically or by means of a gas flame. The plate shall be capable of maintaining the sample continuously at the required temperature, and apparatus necessary to fulfill this requirement, such as a rheostat or gas pressure regulator, shall be provided.
5.1.4 Thermometer - An ASTM Cleveland Open Flash Thermometer, having a range of -6 to + 400°C or + 20 to + 760°F and conforming to the requirements for thermometer 11C or 11F, respectively, as prescribed in Specification E 1, or an equivalent thermometric device that has been calibrated in accordance with Test Method E 220.
5.1.5 A balance, readable to 0.01 g, for determining the mass of the asphalt sample and the mass of the residue.
6. Preparation of Sample
6.1 Thoroughly stir and agitate the sample as received to ensure a complete mixture before the portion for testing is removed.
