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Room-Temperature-Vulcanizing Silicone Rubber (RTV-1/RTV-2)

Room-temperature-vulcanizing (RTV) silicone rubber compounds are a traditional core competence of WACKER. The range of ready-to-use products focuses on numerous applications in the fields of bonding, sealing, potting, encapsulation, coating and casting.

Equally broad is WACKER’s experience in processing techniques and material requirements specific to these applications – from DIY-scale projects right up to industrial production lines.

Important Applications of RTV Silicone Rubber Products

One-part room-temperature-vulcanizing (RTV-1) silicones are ready-to-use systems consisting of polysiloxane, a curing agent, fillers and additives. Immediately after application, the material starts crosslinking on contact with moisture in the air. Byproducts are released during curing. Crosslinking starts with the formation of a skin on the rubber surface and gradually progresses into the compound. Depending on the nature of the crosslinker, small amounts of acetic acid, amine or neutral byproducts, such as alcohol, are released during vulcanization.

RTV-1 silicones are ideal for sealing, bonding and coating applications in nearly all industries, such as

  • Automotive
  • Construction
  • Electrical engineering
  • Electronics
  • Health care
  • Textiles
  • Household appliances

Two-part room-temperature-vulcanizing silicones (RTV-2) are pourable, spreadable or kneadable formulations that vulcanize after mixing. There are two different types of crosslinking reactions: by condensation or by addition. Condensation curing requires an organotin catalyst and always releases byproducts. Addition curing requires a platinum catalyst and does not generate any byproduct.

Special RTV-2 silicone rubber grades can be flash vulcanized using UV light. The vulcanization time can be controlled by adjusting the UV intensity and exposure time.

Like RTV-1 silicones, RTV-2 formulations are ideal for almost all sealing, bonding and coating applications, where they are used for the following:

  • Mold making
  • Household appliances
  • Health-care applications
  • Mechanical engineering
  • Industrial process engineering
  • Lighting technology
  • Electronics
  • Optoelectronics
  • Solar / photovoltaics

Room-Temperature-Curing Silicone Rubber (RTV-2)

Thermally Curing Silicone Rubber (RTV-2)

Silicone Gels

Silicone gels are characterized by a particularly low crosslinking density and produce very soft cured rubber below the Shore hardness range. They are suitable for various applications in industries such as

  • Automotive
  • Transmission and distribution
  • Health and wound care

Developed especially for the automotive industry, gels such as low-temperature flexible gels and fluorinated materials exert only minimal stress on encapsulated components exposed to temperature fluctuations.

Silicone Foams

Silicone foam formulations are characterized by a high concentration of an SiH-rich polysiloxane crosslinker. The basic function of this compound is to crosslink the liquid formulation and release hydrogen, which acts as a blowing agent as curing progresses. Silicone elastomer foams are typically used in applications such as

  • Lightweight construction
  • Damping
  • Thermal insulation
  • Fire safety

SILICONES – Definition and Properties

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