Adhesive tack is the bonding strength between protective film and surface, measured in grams per 25mm width (g/25mm). Low tack (50–150 g) suits glossy surfaces, medium tack (150–400 g) suits brushed metal and painted panels, and high tack (400–800+ g) suits textured surfaces and heavy handling. Choosing the wrong level causes peeling (too low) or adhesive residue (too high).
What Is Tack and How Is It Measured?
Tack quantifies how strongly the adhesive grips the surface. The industry-standard test peels a 25mm-wide film strip from a stainless steel test plate at a 180° angle at constant speed; the force required is the tack value in g/25mm. Lower values mean easier, cleaner removal; higher values mean stronger anchoring.
Two films labeled “medium tack” from different suppliers can behave very differently in practice—always request the actual numeric range and test on your own surface, because surface energy, texture, and cleanliness all shift real-world adhesion.
The Three Tack Ranges in Practice
Low Tack (50–150 g/25mm)
Designed for smooth, high-gloss, or sensitive surfaces where the priority is effortless, residue-free removal. The film grips enough to stay in place during normal handling but releases with minimal force.
- Mirror-polished stainless steel (8K finish)
- Glass sheets and coated glazing
- Polished aluminum and anodized surfaces
- High-gloss plastic sheets (PMMA, PC)
- Painted surfaces with soft coatings
Risk if misapplied: On textured or low-energy surfaces (e.g., powder-coated panels), low-tack film may lift at edges or detach during transport.
Medium Tack (150–400 g/25mm)
The general-purpose range that balances reliable adhesion with clean removal. Most industrial surface protection falls in this band.
- Brushed / hairline stainless steel
- Aluminum coils and profiles
- Powder-coated and painted panels
- APCP (aluminum composite panels)
- Matte plastic sheets
Risk if misapplied: On very glossy surfaces, medium tack can leave faint adhesive ghosting after long dwell times, especially under heat.
High Tack (400–800+ g/25mm)
For demanding conditions: rough or textured surfaces, heavy mechanical handling, long shipping cycles, or outdoor exposure. Removal requires slower, steadier peeling.
- Embossed / checkered metal sheets
- Heavily textured panels
- Long-distance export shipping
- Outdoor storage (with UV-stable adhesive)
- Deep-texture plastics and stone
Risk if misapplied: High tack on smooth or coated surfaces is the leading cause of adhesive residue complaints—removal difficulty increases sharply with dwell time and temperature.
Four Factors That Change Effective Tack
- Surface texture: Rougher surfaces reduce real contact area, so the same film feels “weaker”—you may need one level higher tack.
- Application pressure & temperature: Firm lamination at 20–30°C achieves rated adhesion; cold workshops (below 10°C) significantly reduce initial tack.
- Dwell time: Adhesion builds over the first 24–72 hours. A film tested 10 minutes after application does not show its final strength.
- Removal temperature: Warm film (above 35°C) softens adhesive and increases residue risk; remove film at room temperature whenever possible.
How to Test Tack on Your Surface (5-Minute Check)
- Apply a 100 × 100 mm film square to your actual production surface, pressing firmly by hand or roller.
- Wait 30 minutes, then peel at a slow, steady 180° angle—it should come off smoothly without stretching or tearing.
- Inspect the surface under light at an angle: any shine, ghosting, or residue means the tack is too high.
- Repeat after 24 hours and after 7 days—dwell-time behavior matters more than the initial peel.
- Simulate your real process: if the part goes through bending or cutting, test the film after that step too.
Get the Tack Level Right the First Time
Kaisyon Industrial manufactures PE protective films across the full tack range (50–800 g/25mm) with batch-level tack inspection reports. Send us your surface type and process description, and we will recommend the precise tack level—then ship free samples so you can run the 5-minute test on your own line.
See our product specifications or request free samples today. WhatsApp: +86 199-5273-7006.