3-8109
Industries Served:
Robotically Dispensed Gasket Materials
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Product
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Technology
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Duro
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Mix Ratio
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Description
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OEM Specs
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3-8109
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DFG
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30
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1:1
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2pt, room temperature cure, self-leveling, 11 PCF density |
| Dow Corning® 3-8109 Silicone Foam Two-part, room temperature curing silicone foam system |
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FEATURES |
TYPICAL APPLICATIONS |
| DESCRIPTION DOW CORNING 38109 Silicone Foam is a flowable low hardness product, primarily developed as a dispensed "foamedinplace" gasket material for the automotive and domestic appliance industry. When the A & B liquid components are thoroughly mixed in a 1:1 ratio by volume, the product will expand and cure to a foamed elastomer in approximately ten minutes at room temperature. This foam has a fine cell structure and functions as a seal or gasket where long service life, chemical resistance, good weatherability and low compression set are required. The foam is flowable, so capable of self-leveling on 2-dimensional parts providing uniform seal thickness and joint. The low hardness (Shore 00) makes the product suitable for applications with lower clamping pressure. Furthermore the inherent properties of a silicone elastomer mean that the product can be used over a broad temperature range. The material expands without employing ozone depleting CFCs or other related blowing agents. |
HOW TO USE Mixing To ensure a uniform final foam structure an equal volume of Part A and Part B should be thoroughly mixed. The product has been specifically designed with a favourable 1:1 mix ratio to suit robotic application via metermix/ dispense equipment. Mixing can be achieved either by static or (preferably) dynamic mixing. The type and degree of mixing and shear can significantly affect the cell structure, cure and density of the final foam product. How to apply The meter/mix equipment can be attached to a robotic arm/wrist applicator or on an X-Y-Z table for automatic dispensing. The mixed material can be applied into a groove onto flat surfaces or contoured parts depending on the specific flow characteristics. |
| Cure time Compared to other foam gasket systems DOW CORNING 38109 Silicone Foam is a very fast reacting material, thus allowing parts to be equipped at a high production rate and avoiding the need for temporary storage to fully develop the cure. As supplied and when properly mixed, DOW CORNING 38109 Silicone Foam has a snap time or working time of typically 3 minutes (at 23°C) and is fully cured within about 10 minutes. Being a highly reactive system, the cure and snap time are very dependant upon the temperature of the components just before and after they are mixed. Exposure of the foam material to elevated temperatures up to 50°C can shorten the cure time. In order to eliminate eventual residual surface tackiness a brief heat treatment for 5- 10 minutes at 60-90°C can be carried out. Additionally, to optimise compression set, a post-cure at higher temperatures (100°C) can be performed. (see "Typical properties" table). Note: See Handling precautions, gas evolution. Larger pieces of cured foam should be conditioned for 24 hours at room temperature before exposure to higher temperatures. |
Adhesion |
| TECHNICAL SERVICES For specific information and technical service relating to sealing technologies please refer to the Dow Corning Sealing & Gasketing Expertise Team located in Wiesbaden, Germany. HANDLING PRECAUTIONS PRODUCT SAFETY INFORMATION REQUIRED FOR SAFE USE IS NOT INCLUDED. BEFORE HANDLING, READ PRODUCT AND SAFETY DATA SHEETS AND CONTAINER LABELS FOR SAFE USE, PHYSICAL AND HEALTH HAZARD INFORMATION. THE SAFETY DATA SHEET IS AVAILABLE FROM YOUR LOCAL DOW CORNING SALES REPRESENTATIVE. Gas Evolution Immediately upon mixing DOW CORNING 38109 Silicone Foam Part A and Part B, a chemical reaction takes place that results in the evolution of flammable hydrogen gas. APPROPRIATE CAUTION SHOULD BE EXERCISED! Keep away from sparks and open flames. Adequate ventilation must be provided to prevent localised build-up of hydrogen gas concentration. Also on mixing, some exotherm accompanies the reaction and waste material must be handled, disposed and stored with due regard to this precautionary information, e.g. it should NOT be sealed in plastic bags and large quantities should not be allowed to accumulate. If Part B of DOW CORNING 38109 Silicone Foam comes in contact with strong acids, bases or oxidising materials, it could generate hydrogen. Ensure that containers are properly closed after use in order to avoid any contamination of the contents. |
PACKAGING
WARRANTY |