ASTM D3934 for flash/no flash test-equilibrium method by a closed-cup apparatus
6. Apparatus
6.1 Test Cups, specified in Test Methods D56 (Tag) and D93 (Pensky-Martens). Remove the test cup assembly (including lid and specimen thermometer) from the Tag and Pensky-Martens apparatus to permit either to be used in a separate water bath.

NOTE 1 - If a stirrer is fitted to the test cup, it shall be operated during the heating period but must be stopped during the flashing determination. If a stirrer originally fitted to the test cup is removed, the aperture in the cover shall be securely plugged before starting the test.

6.2 Liquid Bath, capable of being adjusted to the required specification temperature and of adequate heat capacity to meet the requirements of the test. A bath fitted with a stirrer and an adjustable thermostat is convenient (see 9.2).

NOTE 2 - The bath should be fitted with a cover, especially when the specified temperature is above 160°F. At about this temperature the inerting effect of the water vapor may prevent or delay the flashing of the liquid under test.

6.3 Thermometers - Standard thermometers specified in Test Methods D56 and D93. One thermometer shall be used to measure the temperature of the water bath and one shall be used for measuring the temperature of the specimen in the cup.

NOTE 3 - The thermometers for the water bath should be mounted in the bath at the correct level of immersion for which they are specified in Specification E 1.

6.4 Support, for holding the test cup in the liquid bath so that the cover and upper edge are horizontal and the cup is immersed in direct contact with the liquid in such a position that the level of the specimen in the cup is the same as that of the liquid in the water bath.

6.5 Shield - A three-sided shield open in the front, each side 18 in. (460 mm) wide and 24 in. (610 mm) high, is recommended.

7. Reagents and Materials
7.1 Water or a 1 + 1 Mixture of Water and Ethylene Glycol may be used as the bath liquid.