DOWSIL™ 3145 RTV MIL-A-46146 Clear Adhesive Sealant 90ml (3 oz)

DOWSIL™ 3145 RTV MIL-A-46146 Clear Adhesive Sealant 90ml

When electrical assemblies, battery packs, modules and electronic housings require reliable sealing and mechanical support, DOWSIL 3145 RTV Adhesive Sealant provides a practical one-part solution. This clear RTV silicone adhesive/sealant is formulated for applications where controlled, non-flowing application, moisture curing and strong adhesion are important.

The 90ml (3 oz) package is convenient for professional assembly, maintenance and repair work involving electrical and electronic components.

DOWSIL 3145 RTV Adhesive Sealant for Electrical Applications

DOWSIL 3145 RTV Adhesive Sealant is a one-part, moisture-cure RTV silicone designed for sealing and assembly applications involving electrical components. Dow identifies applications including sealing openings in modules and housings, assembly of components on printed wiring boards (PWBs), and sealing in and around wired electrical leads.

The material cures at room temperature through exposure to atmospheric moisture, eliminating the need for mixing before application and avoiding the requirement for an oven in standard room-temperature curing applications.

Clear, Non-Flowing RTV Formulation

The clear formulation is particularly useful where the appearance of the finished assembly matters or where the sealant needs to integrate visually with the surrounding components.

Its non-flowing consistency helps maintain the applied material in position instead of allowing it to run or slump excessively after dispensing. This characteristic is useful when sealing components, housings, electrical leads and assemblies where controlled placement is required.

Dow identifies the product as a non-flowing, high-strength RTV adhesive/sealant with high tensile strength and elongation.

MIL-A-46146 Performance

The DOWSIL 3145 RTV Adhesive Sealant is identified by Dow for MIL-A-46146 Group II, Type I applications. This makes it relevant for users looking for an RTV adhesive/sealant associated with military specification requirements.

The applicable specification and qualification requirements should always be checked against the customer’s engineering documentation before using the product for a regulated or contract-specific application.

Battery Pack, PWB and Housing Sealing

The product is suitable for several electronic and electrical assembly applications, including:

• Battery pack sealing
• Electrical module sealing
• Electronic housing sealing
• Printed wiring board assemblies
• Component bonding and mechanical stabilization
• Sealing around electrical leads
• Wire-entry sealing
• Electrical enclosure applications
• Electronic component protection

The non-flowing formulation can help maintain sealant placement around components and assembly interfaces.

High Strength and Flexible Cured Material

After curing, DOWSIL 3145 RTV provides a combination of tensile strength and elongation. Dow’s current product information lists approximately 940 psi tensile strength and 660% elongation as typical properties.

The combination of strength and elongation makes the cured silicone useful in assemblies where the sealant may experience movement, vibration or mechanical stress.

Technical data should be treated as typical rather than guaranteed production specifications; Dow specifically notes that typical property values are not intended to be used for specification writing.

Electrical Insulation Properties

DOWSIL 3145 is also suitable for electrical applications where dielectric performance is important. Available technical information lists a dielectric strength of approximately 500 V/mil and volume resistivity of approximately 4.4 × 10¹⁴ Ω·cm.

These characteristics support its use around electrical assemblies, PWBs and wired leads. Actual electrical performance depends on the final cured geometry, substrate, environmental conditions and application design.

Room-Temperature Moisture Cure

One of the major advantages of DOWSIL 3145 RTV Adhesive Sealant is its one-part moisture-cure system.

The product does not require two components to be mixed before application. Under normal conditions, atmospheric moisture initiates the curing process. Dow lists a tack-free time of approximately 55–64 minutes depending on the test method/documentation, while full cure depends on factors such as temperature, humidity, bond geometry and access to atmospheric moisture.

Optional heat acceleration may also be considered for faster processing where appropriate.

Typical Industrial Applications

This DOWSIL 3145 RTV Adhesive Sealant can be considered for:

Electronics

For sealing and mechanically stabilizing electronic assemblies, PWBs and electrical components.

Battery Packs

For sealing openings and housings associated with battery-pack assemblies where an appropriate silicone adhesive/sealant is required.

Electrical Housings

For sealing module housings and enclosure openings against environmental exposure.

Wiring and Leads

For sealing around wired electrical leads and entry points.

Industrial Electronics

For assembly, maintenance and protection of electronic equipment used in demanding industrial environments.

90ml (3 oz) Package

This product is supplied in a 90ml (3 oz) tube, providing a practical quantity for professional repair, maintenance, assembly and production applications.

For larger production requirements, customers should select packaging and application equipment according to their dispensing volume and manufacturing process.

Why Choose DOWSIL 3145 RTV?

• Clear silicone adhesive/sealant
• One-part formulation
• Moisture-cure RTV
• Non-flowing consistency
• High tensile strength
• High elongation
• Room-temperature cure
• No mixing required
• Suitable for electrical applications
• Suitable for PWB assembly
• Suitable for module and housing sealing
• Suitable for sealing around electrical leads
• MIL-A-46146 Group II, Type I
• 90ml / 3 oz package

Product Handling and Application

For best results, surfaces should be appropriately prepared according to the manufacturer’s technical documentation and the requirements of the specific assembly.

Because this is a moisture-curing silicone, cure behaviour can vary depending on environmental humidity, temperature, bond thickness and exposure to atmospheric moisture.

For critical electrical, battery or military-specification applications, users should consult the current Dow technical documentation and verify compatibility with the specific substrate and assembly design before production use.

The DOWSIL 3145 RTV Adhesive Sealant should be used according to the manufacturer’s technical and safety documentation.