CRL Gray 1/8" x 1/2" Butyl Glazing Tape - Window Sealant

• Age- and weather-resistant butyl rubber glazing tape
• 100% solids, 0% VOC — no asbestos
• Meets AAMA 804.3, 806.3, 807.3; ASTM C1281
• Used as an exterior primary spacing and glazing seal for windows and architectural joints
• Available in gray and black

CRL Butyl Architectural Glazing Tape (SKU: GT207) is an extruded, preformed tape on release-paper rolls formulated from durable polyisobutylene butyl rubber. Designed for long-lasting, flexible weather seals, it resists normal expansion/contraction and wind loading when glazing glass into window sashes or sealing metal-to-metal, wood-to-glass, and metal-to-plastic joints. Tape thickness is sized to be compressed approximately 10% at installation to accommodate surface alignment and ensure a consistent exterior glazing seal for windows and storefronts.

Typical Properties
Base Polymer: Butyl rubber (polyisobutylene)
Solids Content: 100% solids (no asbestos)
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 and standing water, brushed clean, solvent-washed (MEK, toluene, or naphtha) and wiped dry before applying glazing tape. Apply with positive contact and approximately 10% compression to fully marry surfaces. Keep tapes compressed with clips or wedges for best long-term seals. Use 80 Durometer Shore A setting blocks at sill quarter points and 50 Durometer Shore A spacing shims for glass lites over 100". Place sill tape at or above the sight line unless a cap bead is specified; if a cap bead is used place tape 3/16" (4.8 mm) below the sight line. Do not overlap—always butt ends without stretching. Keep the release paper in place until ready to set the glass.

Product Warning / Limitations:
For applications above two floors, use a spacer, shim, or a structural cap bead (such as silicone) to prevent