The evaluation of defoamer can be e

The evaluation of defoamer can be evaluated from compatibility, foam inhibition, defoaming, degassing and brushing. The methods commonly used to evaluate the defoaming and anti-foaming performance are shake flask method, high speed dispersion method, gas bubbling method, ross-myers method, West Germany industry standard method, shaking method and circulation bubbling method 9. All of these methods use the change of foam volume to evaluate the performance of defoamer. There is no fixed standard for evaluation of Defoamer, and the performance of Defoamer is evaluated by comparing each other. Test method, test conditions, defoamer concentration, stirring time and intensity, the size of defoamer droplets all have an impact on the test results. Which method to use for evaluation depends on the actual application.