Can liquid silicone be extruded?

Can Liquid Silicone Be Extruded?

Yes, liquid silicone rubber (LSR) can be extruded, although the process differs significantly from thermoplastic extrusion. LSR extrusion is a specialized process used to produce continuous profiles, tubes, cords, and gaskets.

Key Considerations for LSR Extrusion:

1. Material Handling: LSR is a two-component system (A and B) that must be precisely metered and mixed before extrusion. The mixed material has a limited pot life at room temperature.

2. Curing: Unlike thermoplastics that cool to solidify, LSR requires heat curing. Extrusion lines typically include a heated curing tunnel or salt bath to complete the vulcanization.

3. Equipment: Specialized LSR extrusion equipment is needed, including cooled extruder barrels to prevent premature curing and precise metering pumps for the two components.

4. Applications: LSR extrusion is used for medical tubing, electrical cable insulation, silicone gaskets, and custom profiles.