Application Type Bond, Seal 1 Part or 2 Part 1 Part Material Form Liquid, Silicone elastomer Industry Capacitors, Light Emitting Diodes (LEDs), E-Mobility Solutions, Smart Meters, Smart Home Devices, Circuit board Manufacturer Dow Chemistry Silicone elastomer Cure Method Moisture, RTV Cure Temperature (°C) 20 to 25, 25 Cure Time (min) 2,880 Viscosity (cPs) Non-flow Color White High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55
Technical Data for Dow 744 RTV Sealant
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Elastomer - Silicone elastomer
- Silicone - Silicone elastomer
- Moisture / Condensation Cure - Moisture
- RTV (Room Temperature Vulcanization) - RTV
Cure Temperature (°C) 20 to 25, 25 Cure Time (min) 2,880 Viscosity (cPs) Non-flow Tack Free Time (min) Fast, 55 Test Method
Shear Strength (psi) 430 Test Method Tensile Strength (psi) 395
Environmental Resistance Environmental resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance
Dissipation Factor 0.00060, 0.00320, 0.00320 Test Method Dielectric Strength (V/mil) Good, Durable, 400 Dielectric Constant 4.41, 4.31, 4.25 Test Method Volume Resistivity (O) 1.1E+15 (ohms/cm)
Shore A Hardness 37 Elongation (%) 590, High Flexibility Flexible
Specific Gravity 1.420
Shelf Life Temperature (°F) 77 Shelf Life Type from date of manufacture Shelf Life (mon) 12
Not Good For
Don't Use With Plastic, rubber
Best Practices for Dow 744 RTV Sealant
All surfaces should be thoroughly cleaned and/or degreased with Dow Corning® brand OS Fluids, naphtha, mineral spirits, methyl ethyl ketone (MEK) or other suitable solvent. Solvents such as acetone or isopropyl alcohol (IPA) do not tend to remove oils well, and any oils remaining on the surface may interfere with adhesion. Light surface abrasion is recommended whenever possible, because it promotes good cleaning and increases the surface area for bonding. A final surface wipe with acetone or IPA is also useful. Some cleaning techniques may provide better results than others
users should determine the best techniques for their particular applications.
Upon standing, some filler may settle to the bottom of the liquid containers after several weeks. To ensure a uniform product mix, the material in each container should be thoroughly mixed prior to use. Two-part materials should be mixed in the proper ratio (1:1 or 10:1) either by weight or volume. The presence of light colored streaks or marbling indicates inadequate mixing.
Automated airless dispense equipment can be used to reduce or avoid the need to de-air. If de-airing is required to reduce voids in the cured elastomer, consider a vacuum de-air schedule of >28 inches Hg for 10 minutes or until bubbling subsides.
Comparable Materials for Dow 744 RTV Sealant
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Tack Free Time Test Methods
|Tack Free Time||Tack Free Temperature|
Shear Strength Test Methods
|430 psi||Lap Shear Strength|
Dielectric Constant Test Methods
|Dielectric Constant||Test Method|
|4.41||At 100 Hz|
|4.31||At 100 kHz|
Dissipation Factor Test Methods
|Dissipation Factor||Test Method|
|0.00060||At 100 Hz|
|0.00320||At 100 kHz|