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

Dow DOWSIL 3-8259 RF Silicone Rubber

Dow DOWSIL 3-8259 RF is a high-performance liquid silicone rubber (LSR) from Dow’s DOWSIL portfolio, engineered for rapid-cure radio-frequency (RF) processing. It delivers excellent flow, low viscosity, and outstanding thermal stability, ideal for precision medical and automotive components requiring biocompatibility and consistent vulcanization.
  • dow dowsil 3 8259 rf silicone rubber_db850a35
  • dow dowsil 3 8259 rf silicone rubber_db850a35

Features Of Dow DOWSIL 3-8259 RF Silicone Rubber

  1. High radio-frequency (RF) transparency for minimal signal attenuation in wireless and 5G applications.

  2. Excellent thermal stability across -60 °C to +200 °C operating range.

  3. Low compression set (<15% after 72 h at 150 °C), ensuring long-term sealing integrity.

  4. UL 94 V-0 rated flame retardancy without halogen additives.

  5. Ready-to-use two-part addition-cure formulation with low viscosity for precision dispensing and molding.

Typical Applications Of Dow DOWSIL 3-8259 RF Silicone Rubber

  1. 5G mmWave antenna radomes and enclosures.

  2. RF-transparent gaskets for telecom base station housings.

  3. Sealing components in automotive ADAS radar sensors.

  4. EMI-shielded but RF-permeable enclosures for IoT edge devices.

  5. Medical RF ablation device housings requiring biocompatibility and signal fidelity.

Specifications Of Dow DOWSIL 3-8259 RF Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-component liquid (Part A + Part B)
AppearanceTranslucent, low-viscosity liquid
Primary ApplicationsRF-transparent seals, radomes, sensor encapsulation
Key FeaturesRF transparency, thermal stability, low compression set, halogen-free flame retardancy
Shore A Hardness (Cured)50 ± 5
Density (g/cm³)1.15 ± 0.05
Cure Temperature RangeRoom temperature to 150 °C


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