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

Wacker ELASTOSIL RT 721 Silicone Rubber

Wacker ELASTOSIL RT 721 is a two-component, addition-cure liquid silicone rubber renowned for excellent mechanical strength, thermal stability up to 200°C, and outstanding replication fidelity. Ideal for precision casting, medical device prototyping, and industrial molding, it offers low viscosity, rapid cure, and biocompatibility per ISO 10993. Trusted globally for reliability and consistency in high-performance elastomer applications.
  • wacker elastosil rt 721 silicone rubber_f2efcb90
  • wacker elastosil rt 721 silicone rubber_f2efcb90

Features Of Wacker ELASTOSIL RT 721 Silicone Rubber

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

  2. Outstanding resistance to compression set, ensuring long-term sealing performance at elevated temperatures.

  3. Good processability with low viscosity base component (Part A) and fast, reliable room-temperature curing with catalyst (Part B).

  4. Excellent electrical insulation properties across wide temperature and frequency ranges.

  5. Compliant with ISO 10993-5 (cytotoxicity) and USP Class VI for biocompatibility-relevant uses.

Typical Applications Of Wacker ELASTOSIL RT 721 Silicone Rubber

  1. Medical device encapsulation and protective coatings for sensors and electrodes.

  2. Sealing gaskets and vibration-damping mounts in automotive electronics and powertrain modules.

  3. Insulating potting compounds for LED drivers, transformers, and industrial control units.

  4. Custom molded components for HVAC systems requiring thermal stability and ozone resistance.

  5. Prototyping and low-volume production of elastomeric parts using RTV-2 casting techniques.

Specifications Of Wacker ELASTOSIL RT 721 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component system: Part A (base), Part B (catalyst)
Appearance (Part A)Viscous, translucent to slightly cloudy liquid
Appearance (Part B)Low-viscosity, colorless to pale yellow liquid
Mixing Ratio (A:B)10:1 by weight
Curing ConditionsRT (23 °C/50 % RH): full cure in 24–48 h; accelerated at 60–80 °C
Shore A Hardness (Cured)70 ± 3
Density (Cured)Approx. 1.14 g/cm³


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