Table 5: Foaming formulation of rigid polyurethane foams with different isocyanate indices.

Ingredients
B-side materialsControl PU foamsSPP PU foams

VORANOL 490 (petroleum-based polyol)10080, 50
Soy-phosphate poyol (soybean oil-based polyol)020, 50
Dimethylcyclohexylamine (gelling catalyst)0.840.84
Pentamethyldiethylenetriamine (blowing catalyst)1.261.26
Dabco DC 5357 (surfactant)2.52.5
Distilled water (blowing agent)3.03.0
A-side material
of PAPI 2770, 80, 90, 100, 11070, 80, 90, 100, 110

All recipes and calculations are based on 100 total parts by weight of polyol, which conventionally dictates that the sum of all polyols adds up to 100 parts.
The amount of isocyanate is based on the isocyanate index. The isocyanate index is the amount of isocyanate used relative to the theoretical equivalent amount.