Dow Corning 3110 RTV Silicone Moldmaking Rubber
Dow Corning 3110, 3112 and 3120 are easy to use silicone mold making rubbers with adjustable cure times. With low mixed viscosity, these two-part RTV rubbers can reproduce intricate details and work in an extensive range of service temperatures. The suggested applications for these materials include encapsulation as well as electronics potting, and they are recommended for simple patterns with no undercuts. Dow Corning 3110, 3112 and 3120 are pourable rubber bases, and after condensation cure, they become flexible and firm silicon rubber. Curing takes place at room temperature no matter the thickness, and cure time depends on each of three catalysts available.
Before using Dow Corning 3110 RTV Silicone, the surface of the original should be cleaned of loose and free material. When working with porous substrates (or whenever necessary,) an appropriate release agent including but not limited to a soap solution or petroleum jelly should be used. Dow Corning 3110, 3112 and 3120 RTV Silicone bases should be stirred thoroughly before use, as prolonged standing can cause filler separation. A clean container should be utilized to mix the base and catalyst until each are mixed together thoroughly. Mechanical or hand mixing are appropriate methods for combining, but be aware that the temperature of the concoction should not exceed 35°C.
The color of Dow Corning 3110 and 3112 is white, and the color of Dow Corning 3120 is Red. The viscosity at 25°C (77°F), poise for Dow Corning 3110 is 130, and for Dow Corning 3112 and 3120 is 280. The specific gravity at 25°C (77°F) for Dow Corning 3110 is 1.14, 1.30 for Dow Corning 3112, and 1.45 for Dow Corning 3120. The tensile strength, die C, psi for Dow Corning 3110 is 395, 640 for Dow Corning 3112, and is 582 for Dow Corning 3120. The elongation of Dow Corning 3110 is 170%, 127% for Dow Corning3112, and 128% for Dow Corning 3120. The durometer hardness, Shore A for Dow Corning 3110 is 45 points, for Dow Corning 3112 is 58 points, and for Dow Corning 3120 is 56 points. If extra data is required, please see the Dow Corning 3110 RTV Silicone Rubber Technical Data Sheet.
Typical Properties of Dow Corning 3110, 3112, and 3120:
| Dow Corning 3110 RTV Rubber¹ | Dow Corning 3112 RTV Rubber¹ | Dow Corning 3120RTV Rubber¹ | |
| Color | White | White | Red |
| Viscosity at 25°C (77°F), poise | 130 | 280 | 280 |
| Specific Gravity at 25°C (77°F) | 1.14 | 1.30 | 1.45 |
| Useful Temperature Range, °C (°F) | -55 to 200 (-67 to 392) | -55 to 250 (-67 to 482) | -55 to 300 (-67 to 572) |
| Tensile Strength, die C, psi | 395 | 640 | 582 |
| Elongation, percent | 170 | 127 | 128 |
| Durometer Hardness, Shore A, points | 45 | 58 | 56 |
Some molds formed from Dow Corning 3110, 3112 and 3120 may degrade if they are exposed to temperatures above 150°C (302°F) over an extended period of time. This damage could also occur if these molds are restricted to a storage space that remains at high ambient temperatures. This occurrence could cause a loss of elastic properties as well as softening in molds created with these silicone rubbers. The usable life for Dow Corning 3110, 3112 and 3120 is 18 months from the day of production if the original unopened containers are stored at or below 32°C (89.6°F). For further handling instructions please contact a Krayden Technical Representative.
When using the S Tin NW or F catalysts, Dow Corning 3110, 3112 and 3120 RTV Silicone are appropriate for use in electronic applications due to the great dielectric properties displayed by the cured rubbers. In cases of dip coating printed circuit boards, a viscosity grade that offers the desired coating thickness should be selected. After pouring Dow Corning 3110, 3112 and 3120 RTV Silicones, the application of a vacuum should follow in order to facilitate the removal of air and assure void-free potting. For more support on application methods, contact Krayden, an authorized distributor of Dow Corning’s Xiameter Silicone.
