Yield
Dependence on Viscosity and Foam Age
How does the viscosity of the polyurethane influence the output of released foam?
The higher the viscosity of the prepolymer of polyurethane products, the slower will be the flow or fluidity. A viscous product has a lower rate of expansion. So the output from an older, more viscous prepolymer falls off; whereas the cell structure of the cured foam becomes correspondingly finer.