Insulcast RTVS Primer 41 Silicone Primer

Description

Insulcast RTVS Primer 41 is a one-component silicone adhesion promoter that prepares metal, glass, plastic, and ceramic substrates before RTV silicone potting or encapsulation. A thin primer coat improves the bond between the cured silicone and the surface, so potted assemblies hold up against moisture, vibration, and thermal cycling in the field.

Insulcast RTVS Primer 41 Benefits

• Improves adhesion of RTV silicone potting and encapsulation compounds to prepared substrates
• One-component formula brushes or wipes on with no mixing
• Low 1 cP viscosity wets out tight surfaces and complex geometry
• Fast air-dry in 30 to 60 minutes keeps assembly lines moving
• Thin applied film at 0.01 to 0.02 mil adds no meaningful build to the part
• Supports durable seals against moisture, dust, and mechanical shock

Common Applications

• Priming housings before potting power supplies, transformers, and coils
• Preparing sensor, connector, and control module surfaces for encapsulation
• Promoting silicone adhesion on LED and lighting electronics
• Surface prep for medical device electronics encapsulation
• Priming EV and e-mobility power electronics enclosures

Typical Properties

• Composition: one component
• Viscosity: 1 cP
• Dry time: air-dry 30 to 60 minutes
• Applied film thickness: 0.01 to 0.02 mil (thin coat)

Surface Prep and Use

Clean the substrate to remove oil, dust, and release agents, and let it dry. Apply a thin, uniform coat of primer by brush or wipe. Allow the primer to flash off and air-dry for 30 to 60 minutes before potting. Once the primer is dry, pot or encapsulate with the matching RTV silicone compound and cure per that product data sheet.

Ordering and Product Support

Insulcast RTVS Primer 41 is part of our encapsulants and potting compounds line, manufactured by ITW Performance Polymers.

Call (800) 220-1966 or email [email protected] for pricing, lead time, and technical support.