CRL Tremco 440 Butyl Architectural Sealant Tape 1/16 x 3/8

• Superior weather-resistant butyl glazing tape
• 100% solids, solvent-free compound
• Available in Aluminum and Black finishes

CRL Tremco® 440 Butyl Architectural Tape is a pre-formed butyl sealant tape designed for non-compression glazing and lap sealing. The 100% solids butyl/polyisobutylene compound contains no solvents or volatiles that cause shrinkage or seal failure. Tremco® 440 forms a watertight, permanently elastic seal with superior weather resistance and adhesion, remaining flexible at low temperatures. Ideal for vision lites and spandrel panels in metal and wood frames in low-rise construction, and for lap sealing between steel, aluminum, porcelain, and other similar or dissimilar materials. Typical Properties:

• Base Polymer: cross-linked butyl rubber (polyisobutylene)
• Solids Content: 100% by weight
• Cure: fully cured before application
• Hardness: 65 durometer Shore "00"
• Temperature Range: Application 20°F (-7°C) to 120°F (49°C); Service -40°F (-40°C) to 158°F (70°C)
• Weathering: Unaffected by ultraviolet through glass; remains flexible at low temperatures

Limitations:

Not for joints subjected to continuous water immersion or temperatures exceeding 158°F (70°C). Not for use with glass lites over 75" (1.91 m). For larger lites, consider a higher-performance system such as CRL Tremco® Pre-Shimmed Butyl Tape.

Applicable Standards:

• AAMA 800-92, 804.3, 807.3

Good Glazing Practices:

Surfaces must be clean, dry, free of frost/standing water, and solvent-washed (MEK, toluene, or naphtha) prior to application. Provide positive contact with approximately 10% compression to fully marry surfaces. Use clips or wedges to maintain compression for best seals. Install 80 durometer Shore "A" setting blocks at sill quarter points. Use spacing shims for glass lites over 100". Place tape on the sill rabbet at or above the sight line unless a cap bead is specified; then place tape 3/16" (4.76 mm) below the sight line. Do not overlap tape ends—abut without stretching. Keep release paper on until ready to set the glass.

Product Warning:

Follow all manufacturer instructions and industry glazing standards. Not for continuous immersion or temperatures above 158°F (70°C). See limitations above for glass size restrictions.