What perforation ratio means on glass and vehicle windows
Tiny holes run across the face of perforated one-way vision material. The ratio tells you how the open area compares with the printed area, so a 50/50 film has roughly equal open and printable space, while 60/40 gives more printable surface and less open space. In plain terms, the more printable area you have, the stronger the graphic reads from outside, but the less clear the view can feel from inside.
This matters on both shopfront glass and vehicle windows. A retail front in Montague Gardens may need a bold message that still lets staff see shoppers approaching, while a panel van in Cape Town might need graphics that stand out on the road without blocking the driver or passengers. The ratio is not just a technical detail, it shapes how the film behaves in day to day use.
- 50/50 usually gives the best balance of visibility and print area.
- 60/40 gives more graphic coverage and a stronger outside image.
- 70/30 gives the most print area, but with less see-through effect.
Why 50/50 is often chosen for mixed visibility
50/50 is a common choice when the same glass must work hard for both sides. From outside, the print reads clearly enough for branding and product messaging. From inside, the open area still allows daylight and outward visibility. That makes it practical for salon fronts, service counters, office partitions and general retail glazing where staff need to keep an eye on movement outside.
It also helps in coastal areas where glare and bright sun can be an issue. A shop in Durban may want graphics that cool the front visually without making the interior feel boxed in. The ratio gives enough structure for the print, yet still leaves useful open space. If the artwork is clean and the text is kept simple, 50/50 can do a lot with a fairly modest loss of transparency.
- Good for front windows where both branding and sightlines matter.
- Useful for short viewing distances, such as reception glass and retail entrances.
- Often chosen when you want the film to look balanced from street level.
When 60/40 gives the better result
60/40 is selected when the outside message needs more weight. The extra printable area gives denser colour and better image impact, especially on vehicles or shopfronts seen from a moving traffic flow. If the graphic includes logos, bold blocks of colour or large service listings, the added print area can make the artwork read more clearly at a distance.
This ratio suits businesses that use the glass mainly for outward communication and need the inside view only as a secondary benefit. Think of a delivery fleet working between Pretoria and Johannesburg, or a roadside branch that gets most of its attention from cars passing quickly. On darker tinted glass the added print area can help the artwork stand out, though it is still important to keep the artwork layout clean and not overcrowd the design.
- Stronger outside branding and better colour hold for simple graphics.
- Often chosen for vehicle side windows and rear windows.
- Works well where the film is seen from further away or at speed.
What 70/30 means for privacy and print coverage
70/30 gives the highest printable area of the common ratios, so it is useful when privacy and graphic coverage matter more than the view through the glass. This can be a good fit for storage room windows, back-of-house areas or vehicle panels where the main job is to carry a message. The trade off is that less open space remains, so the inside view becomes more restricted.
For vehicle work, that needs careful thought. A rear side window on a service vehicle may be suitable for a more graphic heavy layout, but the driver’s view and legal requirements must always come first. Check the current road traffic rules and vehicle glass regulations before fitting any film to a vehicle window. A good installation plan keeps the design useful without creating risk or compliance trouble.
- Best when privacy is more important than clear outward viewing.
- Useful for branding-heavy installations on glass or vehicle panels.
- Needs careful checking on vehicle windows to keep driver visibility legal.
Printing, lamination and installation affect the final look
The ratio alone does not decide the final result. Printing method, artwork quality, colour choice and lamination all shape how the film looks and lasts. When the print is set up for perforated material, the artwork should be prepared with the open holes in mind so text does not land in awkward positions. Fine lines can disappear into the perforations, while bold shapes usually hold better.
Lamination can help protect the printed face from handling, weather and cleaning, especially on exposed shopfronts and working vehicles. On glass, correct surface preparation matters just as much. The glass should be clean, dry and free of grease before application. On vehicles, old film removal, careful templating and edge finishing help the new film sit properly and stay neat. In a place like Gqeberha, where salt air and wind can work on finishes, the prep stage is not something to rush.
- Artwork should be built for the chosen ratio, not squeezed in afterwards.
- Lamination can help protect the print on busy fronts and fleet vehicles.
- Good cleaning and surface prep improve adhesion on glass and vehicle windows.
Choosing the right ratio for a Cape Town to Gauteng rollout
If you are planning a rollout across branches, it helps to keep the ratio linked to the use of each site. A Cape Town showroom in Montague Gardens may use one ratio for the front windows and another for internal screens, while a Johannesburg branch may need a different balance because of road exposure or privacy concerns. The same goes for vehicle graphics, where a courier bakkie, a trade van and a service hatchback can all need different treatment.
A practical approach is to start with the job, then match the ratio to the viewing distance, amount of daylight and need for inward visibility. One retailer may want a softer appearance for customer facing glass, while a field service fleet may need stronger branding on the road. That is why site measuring, vehicle templating and colour proofing are worth doing before production starts. It saves time and helps the finished film work where it is fitted, not just on paper.
- Match the ratio to the site, not the other way round.
- Use stronger print coverage where branding must be seen quickly.
- Keep inward visibility in mind for staff, drivers and safety.
