Description

Product Data Sheet

3M™ VHB™ Tape 4991 is a high-performance gray double-sided acrylic foam tape engineered for demanding bonding applications that require both strength and conformability. Featuring a thick 0.090 inch (2.3 mm) foam core, this tape is ideal for filling gaps, bonding uneven surfaces, and providing long-term durability across a wide range of industrial and commercial uses.

Designed with a multi-purpose acrylic adhesive, 3M™ VHB™ 4991 bonds securely to high and medium surface energy materials such as aluminum, stainless steel, galvanized steel, plastics, acrylic, and polycarbonate. Its conformable foam structure allows it to adapt to irregular surfaces while maintaining strong, consistent contact for reliable bonding performance.

This advanced bonding tape offers a fast, efficient alternative to traditional fastening methods like rivets, screws, and welds. It eliminates the need for drilling, grinding, or finishing while delivering a clean, seamless appearance. The pressure-sensitive adhesive bonds on contact, providing immediate handling strength and continuing to build over time for maximum bond performance.

3M™ VHB™ Tape 4991 also provides excellent environmental resistance, forming a durable seal against moisture, UV exposure, and temperature extremes. Its viscoelastic acrylic foam core absorbs vibration, reduces stress, and accommodates thermal expansion between dissimilar materials, helping maintain bond integrity in dynamic applications.

Common applications include panel-to-frame bonding, attaching trim and nameplates, mounting signage, bonding stiffeners, and assembling components in transportation, construction, electronics, and general manufacturing. With its combination of thickness, strength, and flexibility, 3M™ VHB™ Tape 4991 is a go-to solution for applications requiring superior gap filling and long-lasting performance.