Factors contributing to k-factor optimization with ecomate® foams

Many factors influence the thermal efficiency [or k-factor] one obtains with foams blown with any of the commercial physical blowing agents. Factors affecting a product's thermal efficiency depend on, but are not limited to, the blowing agent itself- such as the blowing agent's molecular weight, its boiling point, or its solubility in the foam matrix. Other factors depend on formulation parameters such as catalyst levels which affect speed of reaction and fineness of cell structure. Yet others depend on the mixing efficiency of the equipment used to process the foams. Finally, a great deal of the contribution depends on the amount of protection the foam receives from its immediate environment- ranging from exposed form to foam enclosed within impermeable facers.

In this paper, designed experiments will explore the effects of formulation parameters, such as catalyst or surfactant type and amount, polyol and isocyanate type, and of course blowing agent blend have on thermal efficiency. We will also show the effects of mixing efficiency, foam flow and density have on this important criterion. Based on these results we will show how to optimize formulations to best utilize ecomate for blowing rigid urethane foams.

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