3M™ VHB™ Window Tape is a conformable double-coated pressure sensitive acrylic foam tape with a chemistry that has outstanding durability, UV resistance and temperature performance.

Unlike other foam types, the high strength acrylic foam is viscoelastic in nature which gives energy absorbing and stress relaxing properties that provides this tape with its unique characteristics.

* For maximum bond strength, all non-glass surfaces should be thoroughly cleaned with a 50:50 mixture of isopropyl alcohol and water to remove contaminants.

*Glass surfaces should be cleaned with a 70/29.5/0.5% mixture of IPA/water/silane solution prior to tape application.

* Pre-mixed solutions are commercially available for a simple cleaning and glass preparation method. Glass is hydrophilic or “water-loving” in nature, meaning water can undercut a tape, adhesive or sealant bond over time. A silane coupling agent in the cleaning solution reacts with the glass to create a hydrophobic or “water-hating” bonding surface. Further surface preparation and application bonding information is available in the following 3M Technical Bulletins:

• Ideal tape application is accomplished when temperature is between 70° and 100°F (21° and 38°C,and the bond is allowed to dwell 72 hours. Initial tape application to surfaces at temperatures below 60°F (16°C,is not recommended.
• Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure develops better adhesive contact and helps improve bond strength. Generally, this means that the tape should experience at least 15 psi (100 kPa) in roll down or platen pressure.
• After application, the bond strength will increase as the adhesive flows onto the surface. At room temperature, approximately 50% of the ultimate strength will be achieved after 20 minutes, 90% after 24 hours and 100% after 72 hours.