Preparation of Room Temperature Vulcanized Silicone Rubber Foam with Excellent Flame Retardancy

Table 2

Properties of the prepared composite materials.

Sample	1	2	3	4
Apparent density ()	0.473	0.456	0.483	0.465
Expansion ratio	2.73	2.76	2.79	2.77
Porosity (%)	56.34	57.62	56.73	55.78