Oxidized bitumens are made by blowing air through hot paving grade bitumen.

The so-called blowing process results in harder bitumen that softens at a higher temperature than that at which paving grade bitumen softens.

Industrial bitumens also have more rubber like properties and their viscosities are much less affected by changes in temperature than is the case with paving grade bitumen.

PROPERTY	UNIT	85/25	95/25	90/40	115/15	STANDARD
Specific Gravity at 250c		1.01-1.05	1.01-1.05	1.01-1.05	1.01-1.05	ASTM D-70
Penetration at 250c, 100gm, 5 sec	0.1 MM	20/30	20/30	35/45	10/20	ASTM D-5
Softening Point, Ring & Ball	0c	80/90	90/100	85/95	110/120	ASTM D-36
Ductility at 250c, after TFOT, MIn	CM	1.5	1.5	1.5	1.5	ASTM D-113
Loss on HEating, MAX	0c	260	260	260	260	ASTM D-92
Solubility in CS@, Min	% Wt	99	99	99	99	ASTM D-4