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

Shin-Etsu KE-551-U Silicone Rubber

Shin-Etsu KE-551-U is a high-performance addition-cure liquid silicone rubber from Shin-Etsu’s KE-550 series, offering excellent flowability, low viscosity, rapid curing, and superior thermal stability for precision molding of medical devices, electronics encapsulation, and soft-touch components.
  • shin etsu ke 551 u silicone rubber_5466d3b9
  • shin etsu ke 551 u silicone rubber_5466d3b9

Features Of Shin-Etsu KE-551-U Silicone Rubber

  1. High-transparency, addition-cure liquid silicone rubber with excellent optical clarity and low haze.

  2. Outstanding thermal stability and long-term reliability over a wide temperature range (–40 °C to +200 °C).

  3. Low compression set and superior elasticity for repeated mechanical stress applications.

  4. Biocompatibility compliant with ISO 10993-5 and USP Class VI standards.

  5. Excellent flow properties and low viscosity for precise mold filling and thin-section encapsulation.

Typical Applications Of Shin-Etsu KE-551-U Silicone Rubber

  1. Optical-grade LED encapsulants and light guide components.

  2. Medical device seals, gaskets, and wearable sensor housings.

  3. Automotive lighting lenses and interior soft-touch components.

  4. Consumer electronics protective coatings and tactile interface pads.

  5. Industrial sealing elements requiring high clarity and chemical resistance.

Specifications Of Shin-Etsu KE-551-U Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-part liquid (Part A + Part B)
AppearanceColorless, transparent viscous liquid
Primary ApplicationsOptical encapsulation, medical devices, precision sealing
Key FeaturesHigh transparency, low compression set, biocompatible
Shore A Hardness (Cured)50 ± 3
Curing Condition100 °C × 5 min or room temperature × 24 h (with catalyst)
Storage Stability6 months at ≤25 °C in sealed containers


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