(in Russian – ГОСТ 5420-74 Графит скрытокристаллический. Технические условия).

This standard applies to cryptocrystalline natural graphite obtained by grinding graphite ores and intended for use in foundry and metallurgical production.

Depending on the physical and chemical composition and area of application, graphite is produced in the following grades in accordance with GOST 17022-81:

Graphite GLS-1 (ГЛС-1)

Ash content, %, not more than = 13,0
The residue on the sieve:
– No. 02, %, not more than = 1
– No. 0071, %, not more than = 10
Moisture content, %, not more than = 1

Graphite GLS-2 (ГЛС-2)

Ash content, %, not more than = 17,0
The residue on the sieve:
– No. 02, %, not more than = 1
– No. 0071, %, not more than = 10
Moisture content, %, not more than = 1

Graphite GLS-3 (ГЛС-3)

Ash content, %, not more than = 22,0
The residue on the sieve:
– No. 02, %, not more than = 1
– No. 0071, %, not more than = 10
Moisture content, %, not more than = 1

Graphite GLS-4 (ГЛС-4)

Ash content, %, not more than = 25,0
The residue on the sieve:
– No. 02, %, not more than = 1
– No. 0071, %, not more than = 10
Moisture content, %, not more than = 1

By agreement with the customer, the Moisture content in GLS-3 (ГЛС-3) and GLS-4 (ГЛС-4) grades is allowed no more than 2%, the value of which is calculated with the consumer.

Impurities visible to the naked eye are not allowed in graphite.