Rubber Extrusion & Cable Vulcanisation Anti-Tack Dusting

In rubber extrusion and cable manufacturing, talc powder provides essential physical anti-blocking action:

Uncured Rubber Sheet and Profile Anti-Tack Dusting

When raw rubber compounds (natural rubber, EPDM, SBR) exit two-roll mills or profile extruders, the warm, tacky polymer surfaces adhere tenaciously to one another upon contact. Uncured rubber slabs pass through continuous dip tanks containing an aqueous slurry of talc powder or through electrostatic powder dusting boxes. The talc platelets form a dry microscopic boundary layer that completely blocks polymer chain interdiffusion, allowing sheets to be stacked on pallets for months without sticking.

Electrical Cable Core Lubrication and Stripping

In multi-core electrical power and telecom cable extrusion, internal copper insulated conductors pass through a continuous talc dusting chamber immediately prior to the outer PVC or rubber jacket extrusion cross-head. The talc powder acts as an inert dry lubricant that prevents the hot outer sheath from fusing to the inner wire insulation, ensuring electricians can strip outer jackets effortlessly on job sites.

Vulcanisation Mandrel Release for Industrial Hoses

When manufacturing curved automotive radiator hoses and hydraulic lines, uncured rubber sleeves are pulled over steel or aluminum shaping mandrels before entering steam autoclaves. Talc powder applied to the mandrel allows smooth sliding during loading and prevents rubber vulcanization bonds from fusing to the metal tool, ensuring easy post-cure stripping.

KIKI'S Industrial Chemicals supplies screened, dry 300 and 400 mesh Talc Powder with high slip properties, free from abrasive silica grit that could abrade cable insulation.