CRL RTV408 Clear Neutral-Cure Silicone Sealant Cartridge

• Compatible for Insulating Glass Glazing
• Excellent Adhesion to Most Surfaces
• Low Odor, Non-Acetic Cure Formula

CRL RTV408 (SKU: RTV408C) Industrial and Construction Silicone is a neutral‑cure, medium‑modulus, 100% silicone sealant that cures to a tough, flexible rubber when exposed to moisture. Its low‑odor, non‑acetic formula provides primerless adhesion to aluminum, stainless steel, most plastics, rigid PVC (vinyl), phenolic resin, glass, ceramic, and most reflective‑coated glasses—making it ideal as a silicone sealant for insulating glass glazing. All surfaces must be properly cleaned and the sealant tooled for good adhesion. Cat. No. S1L2100 Primer may be required for some substrates. Review crlaurence.com/sealants-technical for our Sealant Guidelines to Good Glazing.

BASIC USES & BENEFITS: Fast cure time and easy tooling make RTV408 well suited for in‑house production and field glazing. Non‑corrosive to most building materials—including insulating glass, tile, and sanitary equipment—this silicone seals curtainwall joints, vinyl/steel/aluminum windows, skylights, and is used in vehicles, ships, aircraft, and electrical insulation. Suitable for alkaline substrates (mortar, cement) where metal corrosion is a concern. RTV408 remains flexible and resists cracking across a wide temperature range (~‑65° to 400°F / ‑54° to 204°C) and can be applied at outdoor temperatures as low as ‑20°F (‑29°C) on clean, dry, frost‑free surfaces up to 100°F (38°C). RTV408W and RTV408T include a fungicide for mildew resistance.

All CRL Silicone Sealant cartridges include Screw‑On Nozzles for greater yield per tube. Nozzles are 4" (102 mm), tapered for easy trimming to the desired bead size. To order additional nozzles, specify Cat. No. S1LN0Z.

LIMITATIONS: Not recommended for concrete/stone expansion joints, horizontal decks, patios, driveways or terraces subject to abrasion, submerged joints where porous substrates allow water infiltration, submerged exterior structural sealing, structural glazing, food contact or potable water applications, or mirrors. Check cartridge label and Specification Data Sheet for additional limitations.

TECHNICAL & COMPLIANCE: