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

Wacker ELASTOSIL RT 646 Silicone Rubber

Wacker ELASTOSIL® RT 646 is a two-component, addition-curing liquid silicone rubber renowned for excellent mechanical strength, thermal stability up to 200°C, and low compression set. Ideal for precision molding of seals, gaskets, and medical devices, it offers fast cure, low viscosity, and outstanding biocompatibility per ISO 10993.
  • wacker elastosil rt 646 silicone rubber_920addf5
  • wacker elastosil rt 646 silicone rubber_920addf5

Features Of Wacker ELASTOSIL RT 646 Silicone Rubber

  1. Two-component, addition-cure liquid silicone rubber with excellent flowability and low viscosity for precise mold filling.

  2. High tear strength and outstanding elongation at break, ensuring durability in dynamic applications.

  3. Excellent thermal stability with continuous service temperature range from –50 °C to +180 °C.

  4. Biocompatibility compliant with ISO 10993–5 and USP Class VI (when fully cured), suitable for medical device components.

  5. Low compression set and superior resistance to aging, ozone, and UV radiation.

Typical Applications Of Wacker ELASTOSIL RT 646 Silicone Rubber

  1. Medical-grade tubing and catheter components requiring flexibility and biocompatibility.

  2. Seals and gaskets for automotive engine compartments exposed to high temperatures and oils.

  3. Soft-touch overmolding on electronic housings and wearable device interfaces.

  4. Prototyping and low-volume production of precision elastomeric parts via vacuum casting or injection molding.

  5. Food-contact compliant parts in processing equipment (subject to local regulatory approval).

Specifications Of Wacker ELASTOSIL RT 646 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber
Product FormTwo-component liquid system (Part A: base; Part B: catalyst)
AppearanceTranslucent, low-viscosity liquid (Part A); colorless to pale yellow liquid (Part B)
Mixing Ratio (A:B) by Weight10 : 1
Cure ConditionsAt room temperature (23 °C) for 24 h, or accelerated at 80 °C for 15 min
Shore A Hardness (Cured)60 ± 2
Tensile Strength (Cured)8.5 MPa (typical)
Elongation at Break (Cured)350 % (typical)


Get in Touch with ERICW
Let competitive chemical materials go global.

Your Name *

Your Email *

Your Phone

Country

Your Message *