CRL 33S Bronze Silicone Sealant - Glass & Window Sealant

• 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 (SKU: 33SBRZ) is a high-quality, 100% silicone, one-component, room-temperature curing, acetic-cure elastomer that delivers reliable performance for glazing, sanitary, and general-purpose sealing at a competitive price. No activators, stabilizers, or catalysts are required for optimum cure.

Key applications — CRL 33S is formulated for joining and sealing most non-porous building materials including glass, aluminum, stainless steel, wood, and many plastics. Typical uses: curtainwall joints, steel and aluminum windows, skylights, bathtubs, showers, and sanitary installations. Certain clear/white/translucent white/tan colors contain a fungicide for mildew-resistant cured beads.

Performance & operating range — Wide service temperature range of -80° to 400°F (-62° to 204°C). Can be applied at ambient temperatures as low as -35° to 140°F (-37° to 60°C). Physical properties include 350 psi tensile strength, 120 psi lap shear at 1/8" (3 mm), and 25 ppi tear strength.

Limitations — Not recommended for structural glazing, insulating glass glazing, concrete and stone expansion joints, horizontal decks, patios, driveway/terrace joints subject to abrasion, submerged joints (pools, aquariums), plazas, pavements, or surfaces with special protective/cosmetic coatings (mirrors, reflective glass, polyethylene, polypropylene). Not suitable for painting. Remove old sealant before application. Refer to cartridge label and Specification Data Sheet for full limitations.

Approvals & certifications — Meets Federal Specifications TT-S-001543A (COM-NBS) Class A and TT-S-00230C (COM-NBS) Class A. Meets ASTM C-920 (Type S, Grade NS, Class 25, Use NT, G, A) and CAN/CGSB 19.13-M87. Meets FDA 21 CFR 177.2600 for certain food-related applications and is NSF Certified to Standard 51 for plastic materials used in food equipment. UL Recognized Component. Complies with CARB 2003 VOC requirements and qualifies for LEED credits.

Note: Uncured silicone can turn pinkish when exposed to UV (sunlight) prior to cure; this pink hue disappears after full cure (24–48 hours) if stored and applied correctly. Store in a cool,