Size mm	1 foot	1 1/4 inches	2 inches	3 1/2 inches
Geometric surface area (ft²/ft³)	85	70	48	38
Packing factor	28	25	16	12
Porosity (%)	90	92	93	95
Weight (lb/ft³)	6.2	5.6	4.2	3.3
Quantity/feet³	2300	N/A	380	48