Polishing pitch

Polishing pitches are a mixture of rosin and bitumen at different grades of viscosity (hardness). By applying them as substrate for polishing compounds on the polishing tools, they are used in high-performance optic production. Depending on its ingredients all grades of hardness, from very soft to very hard, are avail able at a graduation of 1° difference.


Polishing pitches are deposited by casting, dropping or melting them on polishing tools, either pure or mixed with enhancing materials (sawdust, felt flakes). Hard types of polishing pitches and those containing enhancing materials are suitable for pre-polishing and, when using higher pressure and speed, while soft types are used for smoother application techniques in precision optic industry.

Technical Data

Polishing pitch soft medium hard
Standard Hardnesses 23 32 42
Other Hardesnesses 17,18,19, 20, 21, 22 24, 25, 26, 27, 28, 29, 30, 31 33, 34, 35, 36, 37, 38, 39, 40, 41

Hardness is defined according to the original Zeiss
Jena standards as the temperature which makes a needle with a pinpoint of 1 mm2 penetrate 2 mm deep into the material within 10 sec at a pressure of 1 kg.

Solubility: Acetone

Delivery units

25x25x160 mm
85x25x160 mm