DETERMINATION OF HOLDING OR TRAPPING CAPACITY OF OPEN CELLED POLYURETHANE FOAM FOR SILICON BASED DEFOAMING AGENTM. GANGADHARA NAIDU AND K.M. SUBBU RATHINAM
A detailed study was performed to determine the holding (or) trapping capacity of open celled polyurethane foam (PUF) for a silicon based defoamer that can be used in the defoaming purposes. The open celled polyurethane foam was found to have a high trapping capacity for undiluted defoaming agent and less trapping capacity for diluted defoaming agent even though the void space volume and the porous grade of all the open celled PUFs used for the study are same. Based on the observed results, it can be confirmed that the holding or trapping capacity of open celled polyurethane foam was decreasing as the increase in dilution of defoamer. It can also confirmed that the trapping capacity of open celled polyurethane foam for the said defoamer was not changing for 4 days of observation period at room temperature.
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