How to Choose Double-Sided and VHB Tape Correctly?
Double-sided tapes and VHB foam tapes replace screws and rivets when the selection is right. This guide explains how to match initial tack, ultimate bond strength and the surface energy of the substrate for a durable, load-bearing bond.
View adhesive tapesInitial Tack or Ultimate Strength - What Counts?
Double-sided tapes have two distinct properties: initial tack, the instant grab on first contact, and ultimate bond strength, which only develops after the adhesive has fully flowed onto the surface. They depend on different adhesive characteristics and cannot be traded off against each other.
VHB foam tapes (Very High Bond) build their full strength slowly: after pressing, they reach roughly 50 % of the final bond immediately, around 90 % after 24 hours and full strength after about 72 hours at room temperature. The viscoelastic acrylic foam distributes stress and absorbs thermal expansion of the joined parts.
- Initial tack: critical on vertical surfaces and fast production cycles.
- Ultimate strength: critical for lasting tensile, peel or shear loads.
- Foam thickness: thicker VHB tapes (1.0‑1.5 mm) bridge unevenness and damp vibration.
- Temperature resistance: acrylic systems withstand -40 to +90 °C continuously, up to +150 °C short-term.
Why Is Surface Energy the Deciding Factor?
Whether a tape holds is decided by the surface energy (SE) of the substrate, measured in millinewtons per metre (mN/m). Only when the material's SE is higher than that of the adhesive does the glue fully wet the surface and make real contact. As a guideline, good bonding with standard acrylic starts at about 34 mN/m.
How Do You Apply Tape Correctly?
The strongest bond is useless on a greasy or dusty surface. Clean both parts with a 50:50 mix of isopropanol and water and let it dry completely. Then press the tape on evenly with about 15 N/cm² - the pressure matters more than how long you hold it.
- Application temperature at least +15 °C, ideally 15‑25 °C; below +10 °C the adhesive does not flow properly.
- Substrates dry and dust-free; never use silicone-based cleaners.
- Press down with a firm roller or squeegee to expel trapped air.
- Apply full load only after 72 hours of curing.
Frequently asked questions
What does VHB tape mean?
VHB stands for Very High Bond, a double-sided acrylic foam tape with no carrier. It distributes stress viscoelastically and reaches ultimate strengths that can replace mechanical fasteners such as rivets.
Why do tapes hold so poorly on PP and PE?
Polyolefins have a very low surface energy of about 28 to 31 mN/m, so the adhesive barely wets them. A primer or plasma pretreatment improves adhesion significantly.
How long must a VHB bond cure?
Right after pressing, roughly 50 % of the final bond is present, about 90 % after 24 hours and full strength after 72 hours. Apply full load only afterwards.
How do I check surface energy?
With a set of calibrated test inks. If the ink beads up, the SE is too low; if the film stays closed for over two seconds, it is sufficient for bonding.
Looking for the right adhesive tape?
We supply double-sided tapes and VHB foam tapes for every surface - including primers and cleaners for low-energy plastics.
Material-matched
Suitable systems for high and low surface energy.
High ultimate strength
VHB foam tapes replace screws and rivets.
Temperature-resistant
Acrylic systems for -40 to +90 °C continuous use.
Expert advice
Our specialists help you make the right choice.