CRL Gray 1/8" x 3/8" Butyl Glazing Tape for Window Sealant

• Age- and weather-resistant butyl rubber formula
• 100% solids, 0% VOC (no asbestos)
• Meets AAMA 804.3, 806.3, 807.3 and ASTM C1281
• Used as exterior primary spacing and glazing seal for windows and architectural joints
• Available in Gray and Black

CRL Butyl Architectural Glazing Tape (SKU: GT205) is an extruded, preformed butyl tape supplied on release-paper rolls. Engineered for long-lasting, flexible exterior seals, it resists aging and weathering while accommodating normal expansion/contraction and wind loading. Ideal as a primary spacing and glazing seal when installing glass into window sashes and for sealing metal-to-metal, wood-to-glass, and metal-to-plastic joints. Designed for approximately 10% compression at installation to accommodate surface alignment.

Typical Properties
Base Polymer: Butyl rubber (polyisobutylene)
Solids Content: 100% solids
Cure Time: Fully cured before application
Hardness: 20 Durometer Shore A @ 77°F (25°C)
Temperature Range: Application 20°F (-7°C) to 120°F (49°C); Service -40°F (-40°C) to 190°F (88°C)
VOC Content: 0%
Joint Movement: ±15% of joint width
Service Life: 20 year minimum

Applicable Standards: AAMA 804.3, 806.3, 807.3; ASTM C1281

Good Glazing Practices
Surfaces must be free of frost, standing water, and contaminants. Clean with a brush, solvent-wash (MEK, toluene, or naphtha), and dry before applying tape. Apply with positive contact and ~10% compression to fully marry surfaces. Maintain compression with clips or wedges for best weather seals. Use 80 Durometer Shore A setting blocks at sill quarter points; use 50 Durometer Shore A spacing shims for glass over 100". Place sill tape at or above sight line unless a cap bead is specified—then place tape 3/16" (4.8 mm) below the sight line. Butt tape ends without stretching; do not overlap. Keep release paper in place until ready to set glass.

Product Warning / Limitations:
For applications above two floors, prevent over-compression by using a spacer, shim, or a structural cap bead (such as silicone), or specify CRL 100+ Load Bearing Glazing Tape.