Table 3.

Surface Area and Structure Characteristics of Various Furnace Grades of CB for Rubber.

Carbon Black Grade	NSA (m2/g)	STSA (m2/g)	OAN (ml/100 g)	COAN (ml/100 g)	Mean Aggregate Diameter (nm) (a)
N115	131	116	112	93	64
N134	140	129	125	104	63
N220	110	103	113	99	78
N234	116	110	126	104	67
N339	91	88	121	99	76
N330	76	76	102	89	84
N326	77	77	73	73	82
N550	38	38	121	83	179
N660	35	34	93	75	168
N772	32	31	69	62	169

^(a) Size of CB aggregates tested by disk centrifuge photosedimentometry after compressing the CB four times at 165 MPa (compressing/crushing identical to the COAN test). Data from Tunnicliffe [47].