3M VHB Acrylic Foam Tape 4991 is a double coated 0.090 in. (2.3 mm) pressure sensitive adhesive tape for bonding many painted metals, as well as unpainted metals, and higher surface energy plastics.
The 3M VHB™ Acrylic Foam Tape 4991 is a double‑coated 0.090 in. (2.3 mm) pressure‑sensitive adhesive tape designed for bonding painted and unpainted metals as well as high‑surface‑energy plastics. It offers a thick, conformable foam core that is suitable for applications requiring a robust, flexible bond.
The sheet lists physical properties, performance characteristics such as peel adhesion, static shear strength, temperature limits, and tensile strength, and provides recommended surface preparation and application temperatures. It also notes shelf life and storage conditions for optimal performance.
| Thickness | 2.3 mm |
|---|---|
| Foam Density | 720 kg/m³ |
| Adhesive Type | Plasticiser Resistant |
| Liner | Red Polyethylene Film |
| Tape Colour | Grey |
| Shelf Life | 24 months at 20 °C & 50 % RH |
| Peel Adhesion | 35 N/10 mm (Stainless Steel) |
| Static Shear Strength (22 °C) | 1000 g |
| Max Continuous Temperature | 90 °C |
| Normal Tensile | 415 kPa |
| Solvent Resistance | High |
Apply the tape at temperatures between 20 °C and 40 °C; avoid applying below 10 °C.
The tape has a shelf life of 24 months when stored in the original carton at 20 °C and 50 % relative humidity.