CRL 33S Silicone Sealant for Aluminum Windows & Doors

• Our Most Popular Sealant
• Plastic Cartridges with Screw-On Nozzles
• Available in Eight Colors
• 24 Month Shelf Life*
• 10 Year Limited Warranty

CRL 33S Silicone — Our most popular sealant (SKU: 33SAL) is a one-component, room-temperature curing, acetic-cure, 100% silicone elastomer that delivers reliable, long-lasting seals without added activators, stabilizers, or catalysts. It offers competitive performance for glazing, weatherproofing, and sanitary applications.

Key Uses - Designed for joining and sealing most non-porous building materials: glass, aluminum, stainless steel, wood, and many plastics. Ideal for curtainwall joints, steel and aluminum windows, skylights, and indoor wet-area installations such as bathtubs and showers. Mildew-resistant formulations: clear, white, translucent white, and tan contain a fungicide for cured beads.

Performance & Application - Operating temperature range: -80° to 400°F (-62° to 204°C). Applicability range: -35° to 140°F (-37° to 60°C). Typical physicals: 350 psi tensile strength; 120 psi lap shear at 1/8" (3 mm) thickness; tear strength 25 ppi. For best adhesion, clean surfaces thoroughly and tool the sealant. Cat. No. S1L2100 primer may be required for some substrates.

Limitations & Warnings - Not recommended for structural glazing, insulating glass glazing, concrete and stone expansion joints, horizontal decks, patios, driveways, submerged joints (pools, aquariums), or on marble, limestone, lead-coated, copper, and brass. Not suitable for painting or surfaces with special protective/cosmetic coatings (mirrors, reflective glass, polyethylene, polypropylene). Remove all old sealant before applying new. Check cartridge label and Specification Data Sheet for additional limitations.

Comparable Products - Comparable to: Dow Corning® 999-A, 786, 732, 700; GE® 1200, 1000, 1700; Dap 100% Silicone; Tremco® Proglaze, Tremsil 200; OSI HM-270; Pecora 860/863; Sika® SikaSil® GP; Sonneborn OmniPlus.

Technical & Compliance - Meets/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