Wednesday, March 17, 2010

Class Warfare: Is A Better Than B? Does It Matter?

Published Wednesday, October 01, 2003

Class A and Class B foams both produce foam. From the standpoint of formulating for performance on these two types of fuels, that is where the similarity ends. In fact, they are diametrically opposed. Clarence Grady is absolutely correct when he points these differences out. Class B foams are formulated to prevent fuel pickup or fuel emulsification. We want the foam to float on the surface of the liquid fuel and not interact with the fuel layer below it. In contrast, when we formulate a Class A foam, we want it to be very surface-active and interact with ...

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