Stepan Co.’s (Northfield, Ill.) newest STEPANFOAM pourable urethane foam is a polyurethane/polyisocyanurate hybrid that reportedly combines excellent flow capabilities with the ability to withstand temperatures of at least 200°C/392°F in resin transfer molding (RTM) and autoclave cure processes. In a thermogravimetric analysis conducted by the company to determine the foam’s percent weight loss as the temperature increased, polyurethane (PUR), polyisocyanurate (PIR), polymethacrylimide (PMI) and the new HTC foams were compared. Weight data (measured as a percentage of weight) was collected as a function of temperature. As expected, the polyurethane foam showed the first signs of degradation as the temperature increased, followed by the polyisocyanurate foam. From 200°C/392°F to 325°C/617°F, the HTC foam also outperformed the polymethacrylimide foam.
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