6. Apparatus
6.1 Container - A 500-mL graduated container of heat-resistant glass, having a diameter of 45 to 50 mm and a length of 380 mm.
6.2 Temperature Bath - Aheat resistant glass container large enough to permit immersion of the graduated container at least to the 350 mL graduation mark. A 4000-mL beaker is satisfactory.
6.3 Heat Source - Any heating system capable of maintaining a uniform bath temperature +/- 1°C (+/- 2°F). A 750-watt electric hot-plate is satisfactory.
6.4 Aerator Tube - A 25.4-mm (1-in.) diameter spherical gas-diffuser stone made of fused crystalline alumina grain which meets the following specifications when tested in accordance with the method given in Annex A1:
6.5 Thermometer - An ASTM Partial Immersion Thermometer having a range from -20 to +150°C (0 to 302°F) and conforming to the requirements for Thermometer 1F as prescribed in Specification E1.
6.6 Air Supply - A clean and dry source, free from grease and other contaminants, capable of maintaining the prescribed flow rate through the diffuser stone.
6.7 Timer - A stop watch or suitable timing device, accurate to +/- 0.2 s.
6.8 Vent - A three-way stopcock inserted in the metered air supply line immediately ahead of the aerator tube.
6.9 Typical Assembly Set-Up - A typical apparatus using a hot-plate heat source is shown in Fig. 1.
7. Materials and Reagents
7.1 Purity of Water - Unless otherwise indicated, references to water means reagent water as defined by Type II of Specification D1193.
7.2 Acetone, for flushing and drying the test equipment. (Warning - Acetone is extremely flammable.)
7.3 Specification D3585 Test Coolant - Unless otherwise indicated, references to the reference test coolant means Specification D3585 coolant prepared without antifoam (Pluronic L-61) as defined in Specification D3585.
7.4 Cleaning Bath - Refers to an acid or base cleaning solution used to clean glassware between tests. The choice of cleaning baths depends on individual needs. For example, Nochromix and alcoholic sodium (potassium) hydroxide are common acid and base cleaning baths, respectively. (Warning - The cleaning baths are strong oxidants and strong acid and base, respectively. Avoid contact with skin, eyes, and clothing. Do not breathe vapor. Handle in a fume hood.)