The Effect of Soluble Ammonium Polyphosphate on the Properties of Water Blown Semirigid Polyurethane Foams

Table 3

Influence of APP on the density, hardness, and compression performance of SPUF.

Samples	Density kg/m^3	Shaw hardness/HA	Compression strength/Mpa	Modulus of compression/Mpa
SPUF	46.64	55.64	0.0280	0.11
SPUF/APP5	46.80	57.69	0.0415	0.50
SPUF/APP7	46.36	57.73	0.0420	0.55
SPUF/APP9	46.45	57.85	0.0410	0.45
SPUF/APP11	46.00	58.69	0.0400	0.45
SPUF/APP13	52.48	59.46	0.0430	0.45
SPUF/APP15	53.28	62.46	0.0445	0.85
SPUF/APP17	54.64	63.27	0.0555	1.00
SPUF/APP19	61.56	64.77	0.0635	1.25