Denka Black

DENKA BLACK (trade name of DENKA ACETYLENE BLACK) is a carbon black produced by continuous thermal decomposition of acetylene gas. DENKA BLACK is composed of colloidal sized particles of carbon blacks, and has such unique properties as good electrical conductivity, high absorption ability of solution, good thermal conductivity, etc., because of following characteristics.

Each particle of acetylene black
1) is composed of Larger crystallites
2) forms longer chain structure
3) has less impurity than other carbon black

Therefore DENKA BLACK has been used as a basic material for producing dry cell, as well as the additive to the antistatic and electrically conductive rubber or plastic materials which are used in various industrial fields, such as electric wires and cables, tires, belts, hoses, heaters, paints, adhesives and many electronics parts.

Grade	General Applications	Packages
50% Press	Powdery manganese dry batteries and various other batteries	10 kg paper bag
Granular	For conductive use, cable semiconduting layer materials, electronic material related, etc.	10 kg paper bag 250 kg flexible container bag

1. Characteristics of "DENKA BLACK"

(1) Unlimitedly High-purity Carbon -----
High Conductivity (Electric Conductivity, Thermal Conductivity, etc.)

"DENKA BLACK" is produced through self-heating pyrolysis of acetylene gas, which requires no oxygen for reaction. Therefore, it is highly pure, the amount of hydrogen existing therein as undecomposed residual matter or as a functional group is extremely small, and functional groups containing oxygen are not found. This closely relates to the fact that "DENKA BLACK" has excellent conductivity.

(2) High "Structure" ----- High Liquid-absorption and High Conductivity

Magnified through electron microscopy, "DENKA BLACK" appears in the shape of black balls linked together. This type of particle linkage is called the carbon black chain "Structure," and this "Structure" is highly developed in the case of "DENKA BLACK" compared with other carbon blacks. The apparent density of "DENKA BLACK" powder is low and this makes possible the retention of a large amount of liquid within this space. Also, besides particles being linked to one another, graphitization is well developed. This makes "DENKA BLACK" highly electrically and thermally conductive.

2. Grades of "DENKA BLACK"

The following two grades of DENKA BLACK are now being produced at Denka Singapore Pte Ltd.

1) Compressed grade, which is manufactured by compressing the powder, has larger apparent density and is more compact. 50% press is being supplied on commercial scales.. They are mainly used as the basic material for producing dry cells.
2) Granule grade, which is manufactured by granulating the powder grade, is mainly used for the purpose of giving electrical conductivity to plastics and rubbers, etc., because of its high compactness and easy handling.

The general characteristics of these three grades are shown in below Table: