DENKA BLACK Properties

DENKA BLACK is composed of carbon particles jointed together in a chainlike fashion, and has a three dimensional chain structure. The internal structure of DENKA B LACK is composed of many crystallites.
Furthermore, another typical chracteristic of DENKA BLACK is very high purity, over 99.5% fixed carbon content. The main impurity may consist of very small content of inorganic materials.
The above-mentioned physical and chemical properties give unique characteristics to DENKA BLACK, such as high solvent adsorption and electrical conductivity.
High purity and good processability are very important properties for almost all application of conductive carbons, especially for semi-conductive layer in XLPE power cables.

General characteristics of DENKA BLACK

Black / Item	50% Compressed	Granule

Moisture (%)	0.07	0.03
Ash (%)	0.02	0.01
Grit (%)	<0.001	<0.001
Electrical Resistivity (Ohms-cm 50 kg/cm2)	0.20	0.19
Acetone Absorption (mg/5g)	38.0	-
Iodine Absorption (mg/g)	84	93
Bulk Density (g/cc)	0.08	0.26

General characteristics of DENKA BLACK and other conductive carbons

		DENKA BLACK	Furnace Type conductive carbon
Black / Item	Unit	Granule	A	B
Composition
Carbon ( C )	%	99.84	96.8	97.8
Oxygen ( O )	%	0.12	1.7	0.55
Hydrogen ( H )	%	0.04	-	-
Ash	%	0.01	1.4	0.9
Volatile Matter	%	0.03	1.0	0.7
Grit	%	<0.001	0.001	0.001
Surface area ( N2 absorb )	m2/g	69	240	1020
Average particle size	nm	35	27	37
Content of metallic impurity
fluorescence X-ray analyzer
Cr	cps*	-	-	240
Ni	"	-	-	3080
Fe	"	290	360	940
Cu	"	120	135	100
Zn	"	10	10	50
Ca	"	10	710	100
S	"	-	9200	3050
Si	"	-	80	-
Al	"	-	50	-
Na	"	-	30	-
Mg	"	-	30	-

*) counts per second

4. Applications of "DENKA BLACK"

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