It is a kind of complex antifoam which is made through the returned students fetching in the advanced foreign technology and studying for a long term with our experts, by using our specific measure and mixing mant kinds of intermediate such as silicon, aether, ester and alcohol. It can clear up the froth quickly and availably, also can restrain the froth increasing again. It has the excellences as follows: enduring high temperature, high efficiency with less quantity, easily dissolving with bean oil, no poison, no cauterization, no harm to fermented and jarless capability. It is quite conformable to cleaning up the froth during the prcess of the pharmacy ferment especially for the penicillin.