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Mounting tape 3M 4991
The 3M 4991 Mounting Tape is a 2.3 mm thick double-sided acrylic foam tape designed for medium- to high-surface-energy materials such as metals and glass. Supplied in a blister pack and identifiable by its red color, this mounting tape provides a conformable, permanent bond suitable for indoor and outdoor applications where a strong, durable adhesive is required.
3M VHB technology combines a conformable foam core with multi-purpose acrylic adhesive on both faces to deliver high strength, good adhesion to a wide range of substrates and resistance to solvents, moisture, UV and temperature variations. The 4991 mounting tape offers immediate handling strength, a clean appearance without visible mechanical fasteners, and consistent long-term performance backed by 3M technical support.
Prepare and clean both bonding surfaces to remove dirt, oil and contaminants; a solvent wipe is recommended for best adhesion. Cut the tape to the required length, apply to one surface and press firmly to ensure contact. Remove the liner and align the second surface, then apply uniform pressure across the bond area to achieve initial handling strength. Allow full bond strength to develop over time according to substrate and environmental conditions.
For optimal performance, use 3M 4991 on dry, clean surfaces with adequate compression during assembly. Avoid bonding to low-surface-energy plastics without prior surface treatment. Store unopened tape in a cool, dry place away from direct sunlight.
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