CRL Clear 321 Acrylic-Latex with Silicone Sealant (Paintable Caulk)

• Suitable for glazing insulating glass units in wood frames
• For exterior or interior use
• Paintable with oil or latex based paints
• Mildew resistant

CRL 321 Acrylic Latex with Silicone is a premium acrylic-latex silicone caulk designed for glazing insulating glass units in wood frames and general-purpose sealing around windows and doors. The acrylic base delivers excellent adhesion, UV and oxidation resistance; added silicone improves flexibility and adhesion to ceramic and glass. Ideal long-lasting sealant for both interior and exterior projects.

Key benefits:

• Primerless adhesion to wood, brick, glass, plastic, vinyl, plaster, drywall, metal and ceramics
• Flexible silicone-enhanced formulation for ±10% joint movement
• Low-VOC, odor-free — meets CARB 2003 requirements and qualifies for LEED® credit
• Water cleanup and easy tooling (toolable ~30 minutes)
• Paintable after 2 hours with oil or latex paints

Typical uses: Sealing and glazing around window and door frames, siding and trim, caulking tubs and sink tops, thresholds, baseboards, grout for marble and ceramic tile, repair mortar joints, and, under controlled conditions, bedding insulating glass units and storm windows. Also suitable for high-moisture areas such as showers, bathrooms, sinks and kitchens.

Performance & temperature range: Can be applied between 40°F and 120°F (4° to 49°C). After full cure, resists temperatures from 0°F to 180°F (-17° to 82°C).

Technical data: Exceeds ASTM C-834-00; meets ASTM C-920 and TT-S-00230C. Meets California Air Resources Board VOC requirements and qualifies for LEED® Green Building Rating System™ credit.

Limitations & warnings: Not for continuous immersion. Do not expose to water or rain for at least 24 hours after application. Apply above 40°F (4°C) and protect from freezing until fully cured. Consult cartridge label and Specification Data Sheet for additional limitations.

Shipping & product notes: Shipping weights are approximate. Contact CRL Customer Service for exact weight if needed to calculate shipping costs. Product images are representative; colors may vary by monitor.

SKU: 321C — Order CRL 321 Acrylic Latex with Silicone caulk now to seal windows, doors and glazing projects with a paintable, mildew-resistant, low-VOC solution.