Table 6:
Calculation of isocyanate density.
SPP
Isocyanate index
Foam density (kg/m
3
)
Theoretical isocyanate amount (g)
Actual isocyanate amount (g)
Isocyanate mass fraction
Isocyanate density (kg/m
3
) = Foam density × isocyanate mass fraction
Compressive strength (kPa)
0
110
48.29
176.62
176.62
1
48.29
461.99
100
44.25
160.57
160.57
1
44.25
424.79
90
41.97
144.50
144.50
1
41.97
376.59
80
38.5
128.45
128.45
1
38.50
347.71
70
35.77
112.40
112.40
1
35.77
324.48
20%
110
45.62
176.62
163.73
0.93
42.29
379.04
100
43.40
160.57
148.85
0.93
40.23
346.97
90
39.65
144.50
133.97
0.93
36.76
313.95
80
36.88
128.45
119.08
0.93
34.19
253.47
70
36.39
112.40
104.20
0.93
33.73
197.40
50%
110
45.40
176.62
144.40
0.82
37.12
264.28
100
41.87
160.57
131.28
0.82
34.23
232.98
90
39.36
144.50
118.15
0.82
32.18
167.07
80
36.98
128.45
105.02
0.82
30.23
147.29
70
47.18
112.40
91.88
0.82
38.56
84.15