Bonding and sealing. Dow DOWSIL 744 Sealant White is a one-component, moisture- and room-temperature-curing silicone elastomer used for bonding large applications such as circuit boards, capacitors, or batteries. It is non-flowing, non-corrosive, solvent-free, has high elongation, and offers good dielectric properties.
Cure and behavior. Dow describes 744 as a one-part, white, moisture-RTV sealant with moderate flow and a fast tack-free time. As a moisture-cure material, it cures on exposure to atmospheric humidity at room temperature, forming a flexible rubber that bonds and seals components.
Non-corrosive advantage. Being non-corrosive is important around sensitive electronics and metals, as it reduces the risk of damaging delicate components during and after curing. Combined with its solvent-free formulation and good dielectric properties, this makes 744 well suited to electrical bonding and sealing.
Handling notes. Because it is moisture-curing, cure depth and speed depend on humidity and section thickness, so deep sections cure more slowly. Its non-flowing consistency helps it stay in place on vertical or intricate surfaces. Review the product and Safety Data Sheets before use.
Key properties: Non-corrosive, solvent-free, high elongation, good dielectric properties
Container size: 310 mL cartridge
Primary Industries
Electronics and PCB manufacturing
Capacitor and battery manufacturing
Electrical assembly
Industrial manufacturing
Standards and Certifications
None specified by source
FAQs
What is DOWSIL 744 used for?
It is a one-part, moisture-cure silicone sealant used for bonding large applications such as circuit boards, capacitors, and batteries. Being non-flowing, non-corrosive, and solvent-free with good dielectric properties, it suits electrical bonding and sealing where a flexible, high-elongation rubber is needed.
How does 744 cure?
744 is a one-part material that cures on exposure to atmospheric moisture at room temperature, with a fast tack-free time. Because moisture drives the cure, cure speed and depth depend on humidity and section thickness; thicker or confined sections take longer to fully cure than thin, exposed ones.
Why is a non-corrosive sealant important?
Non-corrosive means the sealant is less likely to corrode sensitive metals and electronic components during and after curing, thereby protecting delicate assemblies such as circuit boards and capacitors. Combined with a solvent-free formulation, this makes 744 a safer choice around electronics than some acetoxy-cure sealants.
What does high elongation give you?
High elongation means the cured sealant can stretch significantly before failing, so it accommodates movement, vibration, and differing thermal expansion between bonded parts. This flexibility helps maintain a durable seal on assemblies that flex or experience temperature swings in service.
Is 744 suitable for vertical surfaces?
Its non-flowing consistency helps it stay where placed on vertical or intricate surfaces rather than running off before cure, which is useful for controlled bonding and sealing. Confirm the specific flow behavior for your application in the technical data sheet, and review the Safety Data Sheet before use.
