ASTM D1881 Test Method for Foaming Tendencies of Engine Coolants in Glassware
10. Procedure
10.1 Heat 145 mL of solution to 88°C (190°F) in the container positioned in the temperature bath. Immerse the aerator tube and read the level ofthe liquid to the nearest 5 mL. Measure the temperature with the thermometer inside the graduated container.
10.2 Connect air supply, position stopcock to permit air flow to aerator tube, and adjust the air flow rate of 1000 mL/min using a manometer or other suitable instrument for accurately measuring volumes of air flow.
10.3 If the volume of the test solution drops as a result of evaporation, replenish the test solution to its original volume using Type II water before initiating aeration. Measure the temperature of the test solution at the start of aeration.
10.4 The timing of the 5-min aeration period shall start at the appearance of the first bubbles in the test solution.
10.5 At the end of5 min, measure the volume offoam at the highest level and subtract the initial volume read after inserting the aerator tube. Read the foam volume to the nearest 5-mL graduation.
10.6 Relieve the air pressure by positioning the three-way stopcock to shut off the air supply and vent the inlet tube to the atmosphere simultaneously, and record precisely (+/- 0.2 s) the time for the foam to collapse to the first appearance ofan "eye" on the surface of the test solution.
