Nine out of ten adhesive failures we are asked to diagnose are not adhesive failures at all. The tape is fine. The substrate was the wrong one for that chemistry, or the surface was never prepared.
The three chemistries we coat
| Acrylic | Rubber | Hot-melt | |
|---|---|---|---|
| Initial tack | Moderate | High | Very high |
| Final bond (24 h) | Strongest | Strong | Weakest |
| Temperature range | -30 to 90 °C | -20 to 70 °C | -10 to 60 °C |
| UV / ageing | Excellent | Poor — yellows and softens | Poor |
| Solvent resistance | Good | Fair | Poor |
| Best for | Permanent mounting, outdoor, metal and glass | Low-surface-energy plastics, rough surfaces | Packaging lines, temporary fixturing |
Surface energy is the whole story
Adhesive bonds by wetting a surface. Surfaces with high surface energy — steel, aluminium, glass, most painted metal — wet easily and bond well with almost anything. Low-energy surfaces like polypropylene, polyethylene and many powder coats resist wetting, which is why a standard acrylic tape peels off a plastic crate while the same tape welds itself to a steel panel.
Substrate matrix
| Substrate | Use | Notes |
|---|---|---|
| Steel, aluminium (clean) | Acrylic | Degrease first; a 24 h dwell roughly doubles peel. |
| Powder-coated metal | Acrylic, heavy coat weight | Powder coat is textured and low-energy; use 140 g/m² coat and press hard. |
| Glass, glazed tile | Acrylic | Ideal substrate — highest peel values we record. |
| ABS, rigid PVC, polycarbonate | Acrylic or rubber | Both work; rubber grabs faster on curved surfaces. |
| Polypropylene, polyethylene | Rubber, or acrylic with primer | Low energy. Test before production — this is where most field failures start. |
| Plywood, MDF, OSB | Rubber, heavy coat weight | Porous: adhesive sinks in. Rougher surfaces need more adhesive, not more pressure. |
| Concrete, brick | Heavy-tack acrylic | Dust is the enemy; seal the surface or accept 40% of rated peel. |
| Fabric, foam | None — sew it | Adhesive on a compressible surface will creep. Use sew-on tape. |
Application temperature is not service temperature
Adhesive needs to flow to wet the surface. Below about 10 °C acrylic stops flowing and the tape will sit on the surface without bonding — then fall off a week later when the weather changes. If you must apply cold, warm the substrate, use a rubber adhesive, or specify a low-temperature acrylic.
Service temperature is a different figure: it describes what the bond survives after it has formed. A tape rated to 90 °C still needs to be applied at room temperature.
Pressure and time beat everything else
Two things are almost always skipped on a production line:
- Pressure. 10 N/cm² roughly doubles peel compared with finger pressure. A hand roller is not a nip roller; specify one or the other.
- Dwell. Peel measured after 20 minutes is typically 55–65% of peel measured after 24 hours. Test fixtures and QC checks done immediately after application will always read low.
The one test worth doing before you commit
Take three pieces of the actual substrate — not a similar one — clean them the way your line will, apply the tape, wait 24 hours at room temperature, and hang the intended load for a week. This costs nothing and catches the failures that would otherwise appear in your customer’s hands.
Need this applied to your part?
Send the substrate, the load and the drawing. We will come back with a construction, a tolerance and a sample date.
Request a quote