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

Shin-Etsu KE-581-U Silicone Rubber

Shin-Etsu KE-581-U is a two-part addition-cure liquid silicone rubber offering excellent flowability, low viscosity, and high thermal stability. Ideal for precision molding of medical devices, optics, and electronics due to its low shrinkage, biocompatibility (ISO 10993), and platinum-catalyzed cure. Brand: Shin-Etsu; Series: KE-581; Model: U; Core term: Liquid Silicone Rubber.
  • shin etsu ke 581 u silicone rubber_297db494
  • shin etsu ke 581 u silicone rubber_297db494

Features Of Shin-Etsu KE-581-U Silicone Rubber

  1. High-temperature resistance up to 200 °C continuous service with excellent thermal stability.

  2. Low compression set for long-term sealing performance in dynamic and static applications.

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

  4. Good resistance to weathering, ozone, UV radiation, and aging without significant property degradation.

  5. Easy to process via extrusion, injection molding, or compression molding with consistent flow behavior.

Typical Applications Of Shin-Etsu KE-581-U Silicone Rubber

  1. Automotive under-hood gaskets and seals requiring heat and fluid resistance.

  2. Electrical insulation components for transformers, connectors, and high-voltage housings.

  3. Industrial sealing profiles for HVAC systems and compressed air equipment.

  4. Medical device enclosures and non-implantable components compliant with ISO 10993-5.

  5. Consumer electronics protective grommets and interface pads exposed to thermal cycling.

Specifications Of Shin-Etsu KE-581-U Silicone Rubber

Chemical TypeHigh-consistency silicone rubber (HCR), platinum-cured
Product FormUncured compound in sheet or roll form
AppearanceOff-white to light beige, homogeneous elastomeric sheet
Hardness (Shore A)55 ± 3
Tensile Strength (MPa)≥ 6.0
Elongation at Break (%)≥ 350
Density (g/cm³)1.12–1.16
Curing SystemPt-catalyzed addition cure (no by-products)


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