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

Wacker ELASTOSIL RT 685 Silicone Rubber

Wacker ELASTOSIL® RT 685 is a two-component, addition-cure liquid silicone rubber offering excellent mechanical strength, thermal stability up to 200°C, and outstanding flow for intricate molds. Ideal for medical devices and precision casting, it complies with ISO 10993 and USP Class VI standards. Fast curing, low viscosity, and minimal shrinkage ensure high-fidelity replication and biocompatibility.
  • wacker elastosil rt 685 silicone rubber_1c656363
  • wacker elastosil rt 685 silicone rubber_1c656363

Features Of Wacker ELASTOSIL RT 685 Silicone Rubber

  1. High tear strength and excellent elongation at break for demanding dynamic applications.

  2. Low compression set ensuring long-term sealing performance under continuous load.

  3. Good resistance to aging, ozone, and weathering without requiring additional stabilizers.

  4. Easy processing with balanced viscosity and extended pot life for consistent mold filling.

  5. Meets ISO 10993-5 biocompatibility requirements for medical device component manufacturing.

Typical Applications Of Wacker ELASTOSIL RT 685 Silicone Rubber

  1. Medical-grade tubing and fluid handling components in diagnostic and therapeutic devices.

  2. Seals and gaskets for pharmaceutical processing equipment and cleanroom environments.

  3. Soft-touch overmolding on handheld medical instruments and wearable sensors.

  4. Custom molded parts for dental impression trays and orthodontic appliances.

  5. Encapsulants for sensitive electronic modules requiring biocompatible, low-outgassing materials.

Specifications Of Wacker ELASTOSIL RT 685 Silicone Rubber

Chemical TypePlatinum-cured addition-cure silicone rubber
Product FormTwo-component liquid system (Part A + Part B)
AppearanceTranslucent, low-viscosity liquid
Shore A Hardness (7 days, 23°C)65 ± 3
Tensile Strength (ISO 37)8.5 MPa (typical)
Elongation at Break (ISO 37)450% (typical)
Specific Gravity (23°C)1.12–1.14
Curing SystemPt-catalyzed hydrosilylation (inhibitor-modulated)


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