Liquid silicone injection molding

Molded parts made from liquid silicone (LSR) or solid silicone (HTV) are extremely elastic, odorless and tasteless, chemical, UV, ageing and temperature resistant. Numerous fields of application are opened up for those who have mastered the processing methods. Our systems solutions offer you the best possible basis.

At ARBURG, you get everything from a single source: well-founded process expertise, individually configured electric, hybrid, hydraulic or vertical ALLROUNDER injection molding machines, including precisely tailored dosage, vacuum and demolding technology as well as automation. For this purpose, we work closely with the applicable leading manufacturers within the sector.


  • Extensive range for silicone processing: All standard ALLROUNDER machines can be combined with numerous process-specific equipment options
  • Continuous bubble-free feed of HTV with the INJESTER tamping device
  • High processing quality thanks to carefully adapted cylinder modules, such as the automatically closing disc-type non-return valve for LSR
  • Sprueless operation through direct injection by means of a single cold-channel nozzle
  • Reliable evacuation with the SELOGICA control system keeps component quality consistently high

Application examples

Hormone ring
A production cell built around an ALLROUNDER 520 A produces the LSR hormone rings in large unit volumes. As the main contractor, ARBURG bears the complete responsibility. The most stringent requirements with regard to hygiene and product quality must be met during production.
to the molded part

Coupling cushion
Liquid silicone compensates for curvature: thanks to an LSR coupling cushion, a rain/light sensor can be optimally attached to a car windscreen. A multi-component machine molds a low-viscosity liquid silicone (5 Shore A) onto a PBT frame, in which the sensors are inserted.
to the video

Flow straightener
An injection molding system with an electric ALLROUNDER 570 A is used to fully produce, inspect and package a flow straightener made from PBT and LSR for a shower fitting. In order to achieve the hard-soft combination, hot-runner technology is used in the thermoplastic area of the 2+2-cavity mold, while cold-runner technology is used in the LSR part.
to the molded part