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Processes of Manufacturing Ebonite

Mixing natural rubber, sulfur and ebonite powder by using a roll.

Cutting the materials into thin rectangle pieces. Then heating them to be soft raw rubber pieces.

Setting up to adjust the extruder to the necessary diameter.

Putting the raw rubber pieces into the extruder.

This is how ebonite is coming out of the extruder. The EXTRUSION DIE is flamed to smooth the surface of unvulcanized soft ebonite.

Putting the unvulcanized ebonite in metal boxes, which move into the autoclave.


"Vulcanize" with steam for several days. "Vulcanization" means that rubber and sulfur chemically react with each other when heated to dramatically increase the hardness. Skill is required for temperature control during heating. Gradually heat according to the shape and size of the ebonite. Since the autoclave cannot be opened during the steaming process, experts check the steam pressure and exhaust interval to control the heating temperature.