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Silicones from Dow Corning
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RTV Foam Materials


Dow Corning two-part silicone foams are designed to be dispensed and cured directly on parts to form an integrated compression gasket.  The application process is outlined below.   Benefits of silicone foam include:

  • Low to medium hardness, two part system with reduced flow
  • User friendly with easy to handle 1:1 mix ratio
  • Fast ambient cure means no need for temporary storage of equipped parts
  • Low compression set which is retained at high service temperatures which are stable and flexible over a wide temperature range.

Review the sealing application / product recommendation table below.  Select a product link for technical data and MSDS.

ApplicationPartProduct Recommendation*Typical Performance Requirements
 
Domestic Appliance componentsPrinting and Roller Systems, Housings for electrical devicesDow Corning® 8257 Silicone Foam
  • Low hardness (Shore 00)
  • Available in white and black
  • Self levelling
  • User-friendly, easy to handle 1:1 mix ratio
  • Does not contain chlorofluorocarbons (CFCs)
  • Low post-cure compression set
  • Stability and flexibility across a wide range of temperatures

Domestic Appliance componentsHousings for electrical devices and domestic appliance componentsDow Corning® 3-8209 Silicone Foam
  • Low to medium hardness (Shore 00)
  • Self Levelling
  • User-friendly, easy to handle 1:1 mix ratio
  • Fast ambient temperature cure, no need for temporary storage of equipped parts
  • Low compression set which is retained at high service temperatures
  • Stable and flexible over a wide temperature range

Domestic Appliance componentsCooking hobs, housings for electric devicesDow Corning® 3-8219 RF Silicone Foam
  • Medium hardness (Shore 00)
  • Reduced flow aids application to inclined surfaces
  • User-friendly, easy to handle 1:1 mix ratio
  • Fast ambient temperature cure, no need for temporary storage of equipped parts
  • Low compression set which is retained at high service temperatures
  • Stable and flexible over a wide temperature range

Domestic Appliance componentsHousings for electric devices, exterior lighting and domestic appliance componentsDow Corning® 3-8259 RF Silicone Foam
  • Medium hardness (Shore 00)
  • Available in grey and dark grey
  • Reduced flow aids application to inclined surfaces
  • User-friendly, easy to handle 1:1 mix ratio
  • Fast ambient temperature cure, no need for temporary storage of equipped parts
  • Low compression set which is retained at high service temperatures
  • Stable and flexible over a wide temperature range

*Product availability may vary by region.  Product recommendations will vary based on user's performance requirements and application conditions.  Please consult with a Dow Corning technical expert to evaluate your specific needs.

Process:
In situ robotic dispensing of compression seals uses dispensed silicone foam. The robot follows the contour of the component and applies precisely metered bead directly onto sealing surface. After a short time at a low temperature, the dispensed silicone foam expands and cures.

Dispensed Foam Gasketing

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