Product Overview

CRL RTV408 Industrial and Construction Silicone is a high-quality, neutral cure, medium modulus, 100% silicone sealant that cures into a tough, flexible rubber when exposed to moisture. It offers primerless adhesion to aluminum, stainless steel, most plastics, rigid PVC (vinyl), phenolic resin, glass, ceramic, and most reflective-coated glasses. All surfaces must be properly cleaned, and the sealant must be tooled for optimal adhesion. Cat. No. S1L2100 Primer may be required for these and other substrates as well.

This silicone sealant is compatible with Insulating Glass Glazing and provides excellent adhesion to most surfaces. It features a low odor, non-acetic cure formula.

BASIC USES: Its fast cure time and easy tooling make it ideal for a wide range of in-house production applications. It is non-corrosive to most building materials such as glass (including insulating glass), tiles, and sanitary equipment. It is suitable for sealing curtainwall joints; vinyl, steel and aluminum windows; and skylights. Additionally, it is used in vehicles, ships, and aircraft, as well as for electrical insulation. This silicone does not cause corrosion when in contact with metals. It is suitable for use with alkaline materials such as mortar and cement and for other applications where metal corrosion could be a concern. CRL RTV408 remains flexible and is resistant to cracking or becoming brittle in a wide range of temperatures, approximately -65°F to 400°F (-54°C to 204°C). It can be applied at outdoor temperatures as low as -20°F (-29°C), provided that surfaces are clean, dry, and frost-free or on surfaces as high as 100°F (38°C). Both RTV408W and RTV408T contain a fungicide, and the cured sealant is mildew-resistant.

Product Warning: This sealant is not recommended for use in aquariums, with PMMA, PE, PP, bituminous surfaces, and surfaces containing wax or paraffin. Application in poorly ventilated areas not exposed to UV light may lead to yellowing, and this can also occur in contact with chemical fumes and surfactants, especially during curing.