Hardness: 1 Moh's.

Talc chalk Silica: 60% ± 1.

Talc chalk Magnesium oxide: ≥ 30%.

Finish: Not polishing.

Certification: ISO9001.

We have size of  125x12x5mm ,  127x12.7x4.8mm,  6.4x127mm round, 100x10x10mm, 10x10x80mm.10x5x80mm, 75x10x10mm, 75x10x5mm, 5.5x120mm round. 

Characteristics: Fastness when firing, line is clear,dust free.

Application: Used by welders or fabricators for marking on metals when cutting steel plate or welding.

Use: Mechanical manufacturing, Vehicles manufacturing, ship manufacturing, steel factory, etc.