High-strength electronic adhesive. Dow DOWSIL 3145 RTV MIL-A-46146 Adhesive Sealant Clear is a one-component, room-temperature-curing silicone adhesive used for assembling printed wire boards and sealing housings, modules, and electrical leads. It is non-flowing and has high elongation, tensile, and tear strength.
Cure and behavior. Dow describes 3145 as a one-part, moisture-RTV, non-flow, high-strength adhesive. It cures at room temperature on exposure to atmospheric moisture, transforming from a paste before cure to a durable elastomer after cure, forming strong, flexible bonds and seals.
Standards and recognition. 3145 is MIL-A-46146 qualified and UL recognized, making it suitable for electronic assembly applications that call for those recognitions. Its combination of high tensile strength, elongation, and tear strength provides robust, reliable bonds in circuit assemblies and housings.
Handling notes. Because it is a moisture-cure adhesive, 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: High elongation, tensile, and tear strength
Recognition: MIL-A-46146; UL recognized
Container size: 90 mL tube
Primary Industries
Electronics and PCB manufacturing
Aerospace and defense electronics
Industrial electronics
Module and housing assembly
Standards and Certifications
MIL-A-46146 qualified
UL recognized (per Dow; confirm current listing)
FAQs
What is DOWSIL 3145 used for?
It is a one-part, room-temperature-curing silicone adhesive used to assemble printed wire boards and to seal housings, modules, and electrical leads. Non-flowing and high in strength, it forms durable, flexible bonds and seals, and it is qualified to MIL-A-46146 for demanding electronic applications.
How does 3145 cure?
3145 is a moisture-cure RTV adhesive that cures at room temperature upon exposure to atmospheric humidity, changing from a paste to a durable elastomer. Because moisture drives the cure, cure speed and depth depend on humidity and section thickness, so deep or confined sections cure more slowly than thin ones.
What standards does 3145 meet?
Dow states 3145 is MIL-A-46146 qualified and UL recognized, making it suitable for applications requiring those recognitions. Because listings can change and depend on grade, users needing formal qualification should confirm the current MIL and UL status for their specific product and application.
Why is 3145 described as high strength?
It combines high tensile strength, high elongation, and high tear strength, so the cured adhesive resists pulling apart, stretches to accommodate movement, and resists tearing. This robust mechanical performance suits electronic assemblies and housings that must endure handling, vibration, and service stresses.
Is 3145 suitable for vertical or intricate surfaces?
Yes. Its non-flowing consistency helps it stay where placed rather than running off before cure, which is useful for controlled bonding and sealing on vertical or intricate electronic assemblies. Confirm the specific handling behavior for your application in the technical data sheet before production.
