Composite index

Open porosity w, %

Ultimate strength at compaction, MPa

Density, ρ, g/cm3

Chemical resistance, %

CH-6

15.2

256

2.25

water

acid

99.82

99.20

CH-7

15.2

258

2.31

99.79

99.25

CH-8

15.4

254

2.78

99.80

99.30