Foam Stability Index: A Practical Lab Method

A 250 mL graduated cylinder, a calibrated dispensing tube, a stopwatch and a 25 °C water bath are enough to characterize a board foam's half-life, density and qualitative bubble distribution. This whitepaper describes the apparatus, the procedure, the data reduction and the way the results map to forming-station behavior on a continuous line.

Includes correlation data between lab FSI and observed line performance across eleven customer plants. Available on request.