About Synthetic Graphite

There is no manufacturer in Japan to aim to produce only Synthetic Graphite Powder particularly, but it is produced by grinding and processing Synthetic Graphite Electrodes as a raw material.  In this case, it should be payed attention to Carborundum which is attached on the surface of Synthetic Graphite Electrodes during the manufacturing process.  It must be removed, because the lubricity is significantly inhibited if it is mixed into the products.  However, it is a struggle to remove them.  The grade of Synthetic Graphite is generally high at about 0.5% ash, 0.5% volatile, 99% fixed carbon, and 0.02% total sulfur, but its fire resistance and lubricity are inferior to those of Natural Graphite.  The manufacturing process for Synthetic Graphite Electrodes is as follows; Pitch and tar are added to the main raw material oil coke, heated, kneaded, molded, and fired at 1,000 to 1,200 degrees (primary firing).  Then, it is fired in a graphite-moderated reactor at a temperature of 2,800 to 3,000 degrees, and it is graphitized to form electrodes.

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Main Applications

The Reason Why Graphite is Used for Carbon Brushes

Graphite has the following properties.  It having a good conduct of electricity, a low coefficient of friction and high heat resistance, is a hexagonal crystal, and an intercalation compound in which each is bonded by weak intermolecular forces, Van der Waals force.  The material properties required for carbon brushes are that they have low frictional force on high-speed rotating (moving) bodies, receive and supply a large amount of electric current, and withstand heat generation and oxidation.  These properties are exactly the same as the properties required by carbon brushes and this is the reason why Graphite is used in carbon brushes.

List of Synthetic Graphite

Product Name	FC (Fixed Carbon)	ASH	VM (Volatile Matter)	MO (Moisture)	Granularity (Opening)	Average Particle Diameter (μm)
KN	97.5% or more	1% or less	1.5% or less	1% or less	–	9
G70	98.5% or more	1% or less	0.5% or less	1% or less	–	66±5
E100	98.5% or more	1% or less	0.5% or less	1% or less	–	38
SF-CH	98.5% or more	1% or less	0.5% or less	1% or less	–	10-30
SRN-10N	99% or more	1% or less	–	0.1% or less	-45μm 99%	10
SRN-10F	99% or more	1% or less	–	0.2% or less	-45μm 99%	10
SRN-10J	99% or more	1% or less	–	0.2% or less	–	10
SRN-25J	99% or more	1% or less	–	0.2% or less	–	25
SRN-30J	99% or more	1% or less	–	0.2% or less	–	30
SRN-45J	99% or more	1% or less	–	0.2% or less	–	45
SRN-60J	99% or more	1% or less	–	0.2% or less	–	60
SSG-30	99% or more	1% or less	–	0.1% or less	-500+106μm 90%	–
SSG-80	99% or more	1% or less	–	0.1% or less	-1000+180μm 90%	–
SSG-50	99% or more	1% or less	–	0.1% or less	-2000+500μm 90%	–
SSG-5L	98% or more	1% or less	–	1% or less	0.3-0.5m/m: 80±10%	–
SF-1	95% or more	3% or less	2% or less	1% or less	–	35
CI-5	98% or more	1% or less	1% or less	1% or less	1000-0.5mm: 80%	–
CI-1	98% or more	1% or less	1% or less	1% or less	-0.5mm: 80%	–
Synthetic Graphite 0.5-5mm	98% or more	1% or less	1% or less	1% or less	0.5-5mm: 80%	–
Synthetic Graphite 0-3mm	98% or more	1% or less	1% or less	1% or less	-3mm: 80%	–
Synthetic Graphite 3-10mm	98% or more	1% or less	1% or less	1% or less	3-10mm: 80%	–
Synthetic Graphite 10-20mm	98% or more	1% or less	1% or less	1% or less	10-20mm: 80%	–