Table 6: Calculation of isocyanate density.

SPPIsocyanate indexFoam density (kg/m3)Theoretical isocyanate amount (g)Actual isocyanate amount (g)Isocyanate mass fractionIsocyanate density (kg/m3) = Foam density × isocyanate mass fractionCompressive strength (kPa)

011048.29176.62176.62148.29461.99
10044.25160.57160.57144.25424.79
9041.97144.50144.50141.97376.59
8038.5128.45128.45138.50347.71
7035.77112.40112.40135.77324.48

20%11045.62176.62163.730.9342.29379.04
10043.40160.57148.850.9340.23346.97
9039.65144.50133.970.9336.76313.95
8036.88128.45119.080.9334.19253.47
7036.39112.40104.200.9333.73197.40

50%11045.40176.62144.400.8237.12264.28
10041.87160.57131.280.8234.23232.98
9039.36144.50118.150.8232.18167.07
8036.98128.45105.020.8230.23147.29
7047.18112.40 91.880.8238.56 84.15