ASTM D3519 Standard Test Method for Foam in Aqueous Media (Blender Test)
3. Summary of Test Method
3.1 The increase in volume is determined by the increase in total height of test fluid including foam after blending for 30 s using a commercial-type blender with glass jar (see Note 2) at 25 +/- 1°C (77 +/- 1.8°F) agitating between 4000 and 13000 rpm. The preferred range would be 8000 +/- 1000 rpm.
4. Significance and Use
4.1 The results obtained by the test method described are useful as guides in determining the tendency of a water-based metalworking coolant to produce foam under high shear conditions. No correlation with changes in heat transfer, pumpability, or other factors affected by foam is intended. The foam produced by any given industrial process depends on the method by which the foam is generated and may not be directly proportional to that produced by this carefully controlled laboratory test method. Further, the foam generated at the specified test temperature will not necessarily predict the foaming tendency of the liquid (that is, metalworking coolant) at some other use temperature.
