Glass protective film should be medium to high tack (200–600 g/25mm), 60–80 microns thick, with high tensile strength to survive cutting-table handling, transport vibration, and job-site storage. Float glass accepts higher tack than coated or mirrored glass, which needs low-tack film to avoid residue on reflective coatings. This buyer’s guide covers the selection factors that matter for flat glass, tempered glass, and glazed units. Kaisyon Industrial, a China-based PE protective film manufacturer, supplies glass protection film from 60–80 microns with tensile strength matched to cutting-table handling, and offers free samples so float, coated and mirrored glass can be peel-tested before ordering.
Why Glass Is a Demanding Surface
Unlike metal panels, glass protective film must do two jobs at once: protect the surface from scratches and provide mechanical grip that keeps sheets from sliding against each other in racks and crates. Film on stacked glass endures continuous point pressure, grit trapped between sheets, and vibration during road transport — it must resist abrasion and puncture, not just scratching. That is why glass film is typically thicker (60–80 μm) and more puncture-resistant than film for metal surfaces.
Film Selection by Glass Type
| Glass Type | Recommended Tack | Typical Thickness | Notes |
|---|---|---|---|
| Float glass (raw) | Medium–high (200–600 g/25mm) | 60–80 μm | High surface energy, bonds readily |
| Tempered glass | Medium (200–400 g/25mm) | 60–80 μm | Apply before tempering or after, per process |
| Low-E coated | Low–medium (80–250 g/25mm) | 50–70 μm | Coating is sensitive — always test first |
| Mirror / silvered | Low (50–150 g/25mm) | 50–60 μm | Residue on mirror is a warranty claim waiting to happen |
| Glazed units (IGU) | Medium | 60–80 μm | Must survive glazing and stay removable at handover |
The pattern mirrors stainless steel selection: the more sensitive the surface, the lower the tack. If you handle both glass and metal, our general selection guide covers the underlying surface-energy logic, and the tack levels guide explains the g/25mm rating system.
Critical Performance Requirements
Cut-Table Compatibility
Glass fabricators cut filmed sheets on CNC and manual tables. The film must not gum up cutting wheels or leave adhesive strings on cut edges. Film formulated for clean cutting uses tougher face layers that shear rather than stretch — a detail that separates glass-grade film from generic packaging film.
Anti-Slip Grip in Racks
Stacked glass sheets rely partly on film friction to stop sheet-on-sheet slipping. Matte or slightly textured outer surfaces provide better rack grip than glossy film. For export shipments in containers, ask for film specifically rated for anti-slip performance.
UV and Outdoor Staging
Glazing packages often sit on job sites for weeks. Film left outdoors must be UV-stable, or it embrittles, shreds on removal, and bakes adhesive onto the glass. Specify the expected outdoor dwell time with your supplier and check the storage guidance — the same UV rules apply on the job site as in the warehouse.
Clean, Complete Removal
Film should remove in one continuous pull at glazing handover. Poor film tears into strips, forcing glazers to scrape, which risks scratching the very surface being protected. If your crews report tearing during removal, the film is either under-specified for the dwell time or past its usable life.
Ordering Checklist
- Confirm glass type(s) and any coatings with your supplier before specifying tack;
- State the maximum time film stays on glass, indoor and outdoor;
- Request the sheet size and roll width match — glass film is often applied at the float line in jumbo widths;
- Ask for UV rating if film will see job-site storage;
- Get sample rolls and test on your actual glass before volume orders;
- For exports, confirm film performance at destination climate (tropical humidity, desert heat).
Common Questions
Can one film work for all glass types?
Medium tack (250–350 g/25mm) at 70 microns is a reasonable general-purpose choice for float and tempered glass. But mirrors and Low-E coatings genuinely need lower tack. Running two film specs costs little compared to a single residue claim on a truckload of coated glass.
Why does film leave residue on some glass and not others?
Coated glass surfaces (Low-E, reflective, painted) have lower surface energy than raw glass and interact differently with adhesive. Tack that is safe on float glass can bond chemically to coatings over time. Heat accelerates the process. There is no substitute for a dwell-time test on the actual coated product.
Get Glass-Grade Protective Film
Kaisyon supplies glass protective film from 50–800 g/25mm tack, in jumbo widths up to 1,600 mm, with UV-stable formulations for extended outdoor staging and anti-slip outer layers for rack and container shipping. Samples and peel-test data available on request. Contact us for a quote.