CRL 33S Translucent White Silicone Sealant — Waterproof Glazing Caulk

• Our Best-Selling Silicone with Special Additives to Resist Mold and Mildew
• Plastic Cartridges with Screw-On Nozzles
• Available in Eight Colors
• 24 Month Shelf Life*
• 10 Year Limited Warranty

This is our most popular sealant. CRL 33S Silicone (SKU 33STW) is a high-quality, 100% silicone elastomer sealant formulated for long-lasting, mildew resistant seals in glazing, window, shower, and sanitary applications. It is a one-component, room-temperature curing, acetic cure silicone that requires no activators, stabilizers, or catalysts for optimum performance.

Basic Uses - CRL 33S Silicone is designed for joining and sealing most non-porous building materials including glass, aluminum, stainless steel, wood, and many plastics. Proper surface cleaning and tooling are required for good adhesion. Cat. No. S1L2100 Primer may be required for some substrates.

Performance & Temperature Range - Wide operating range from -80° to 400°F (-62° to 204°C). Can be applied at outdoor temperatures as low as -35° to 140°F (-37° to 60°C). Key physical properties: 350 psi tensile strength; 120 psi lap shear at 1/8" (3 mm); tear strength 25 ppi. Suitable for curtainwall joints, steel and aluminum windows, skylights, bathtubs, showers, and sanitary installations. Mildew resistant colors (clear, white, translucent white, tan) contain a fungicide for cured beads.

Limitations - Not recommended for structural glazing or insulating glass glazing, concrete and stone expansion joints, horizontal decks, patios, driveways, terraces subject to abrasion, submerged joints (pools, aquariums), or surfaces with special protective coatings (mirrors, reflective glass, polyethylene, polypropylene). Not suitable for painting. Check cartridge label and Specification Data Sheet for additional limitations.

Compliance & Certifications - Meets or exceeds:

• TT-S-001543A (COM-NBS) Class A
• TT-S-00230C (COM-NBS) Class A
• ASTM C-920 Type S, Grade NS, Class 25, Use NT, G, A
• CAN/CGSB 19.13-M87

CRL 33S meets FDA 21 CFR 177.2600 for certain food-related uses (walk-in freezers, refrigerated trucks), is NSF Certified to Standard 51 (plastic materials in food equipment), is a UL Recognized Component, meets CARB 2003 VOC requirements, and qualifies for LEED® credit.

NOTE: Uncured silicone may turn pinkish with UV exposure until cured (24–48 hrs); once cured the