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

Wacker ELASTOSIL RT 721 A B Two-Component Silicone Rubber

Wacker ELASTOSIL RT 721 A/B is a two-component addition-curing liquid silicone rubber offering excellent flow, low viscosity, and high tear strength. Ideal for precision casting, medical device molding, and industrial prototyping. Features outstanding dimensional stability, biocompatibility (ISO 10993), and rapid room-temperature cure without by-products. Brand: Wacker; Series: ELASTOSIL RT; Model: 721 A/B; Core term: Liquid Silicone Rubber.
  • wacker elastosil rt 721 a b two component silicone rubber_bb3d8b1f
  • wacker elastosil rt 721 a b two component silicone rubber_bb3d8b1f

Features Of Wacker ELASTOSIL RT 721 A B Two-Component Silicone Rubber

  1. Excellent thermal stability with continuous service temperature range from –60 °C to +180 °C.

  2. Fast room-temperature vulcanization (RTV) without the need for heat curing.

  3. Low viscosity and excellent flow properties for precise mold filling and fine-detail replication.

  4. High tear strength and outstanding elongation at break for durable, flexible elastomer parts.

  5. Good electrical insulation properties and UL 94 V-0 flammability rating (when cured).

Typical Applications Of Wacker ELASTOSIL RT 721 A B Two-Component Silicone Rubber

  1. Prototyping and low-volume production of functional silicone parts via casting or vacuum molding.

  2. Manufacturing of gaskets, seals, and vibration-damping components in automotive and industrial equipment.

  3. Encapsulation and potting of sensitive electronic modules requiring thermal and electrical insulation.

  4. Production of medical device prototypes and non-implantable components compliant with ISO 10993-5 (cytotoxicity).

Specifications Of Wacker ELASTOSIL RT 721 A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component liquid system (Part A: base, Part B: catalyst)
Appearance (Mixed)Translucent, low-viscosity liquid
Mixing Ratio (A:B)10:1 by weight
Cure Time (23 °C / 50% RH)Surface cure: ~30 min; Full cure: 24 h
Hardness (Shore A, ASTM D2240)~72 A
Elongation at Break (ASTM D412)~450 %
Tensile Strength (ASTM D412)~7.5 MPa


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