Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Wacker LUMISIL 903 Silicone Rubber

Wacker LUMISIL 903 is a two-component platinum-cured liquid silicone rubber (LSR) offering excellent flowability thermal stability and biocompatibility ideal for medical device molding and precision encapsulation applications.
  • wacker lumisil 903 silicone rubber_d398741f
  • wacker lumisil 903 silicone rubber_d398741f

Features Of Wacker LUMISIL 903 Silicone Rubber

  1. High-transparency, platinum-cured liquid silicone rubber (LSR) with excellent optical clarity.

  2. Fast curing at elevated temperatures, enabling high-efficiency injection molding cycles.

  3. Outstanding biocompatibility, compliant with ISO 10993 and USP Class VI requirements.

  4. Low compression set and excellent thermal stability across –60 °C to +200 °C.

  5. Good flow properties and low viscosity for precise filling of complex, thin-walled molds.

Typical Applications Of Wacker LUMISIL 903 Silicone Rubber

  1. Medical-grade tubing and catheters requiring optical clarity and sterilizability.

  2. Optically transparent seals and gaskets in diagnostic and analytical devices.

  3. Soft-touch overmolding on precision instruments and handheld medical equipment.

  4. Microfluidic components and lab-on-a-chip encapsulation layers.

  5. Pharmaceutical stoppers and closures where extractables and leachables must be minimized.

Specifications Of Wacker LUMISIL 903 Silicone Rubber

Chemical TypePlatinum-cured Liquid Silicone Rubber (LSR)
Product FormTwo-component liquid system (Part A + Part B)
AppearanceTransparent, viscous liquid
Shore A Hardness (cured, 23 °C)35 ± 2
Tensile Strength (cured)5.0–6.5 MPa
Elongation at Break (cured)450–550 %
Curing Temperature Range120–180 °C
Primary ApplicationsMedical devices, diagnostics, pharmaceutical contact parts


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