"99% UV" Covers 25% to 100%: The Figure for Each Film

Measured UV blocking across the FancyFix window film range runs from 25% to 100%, not a single 99% figure. The number depends on which construction the film is built on: adhesive solar-control film blocks 99% of UV in every colour, static-cling solar film blocks between 72.42% and 90.27%, and a clear safety film blocks 25%. A supplier quoting one UV number for a whole catalogue is quoting a marketing line, not a measurement.

Where "99%" comes from, and where it stops being true

"99% UV" is a real measured figure for some films and wrong for others, which is why it should never be printed range-wide. On FancyFix adhesive solar-control film the 99% figure holds across every colour in the line — light blue, gray blue, brown silver and double-sided silver all measure the same 99%, because UV is the one property on that construction that does not vary with colour. On FancyFix static-cling solar film, built on a different base, the same claim would overstate the weakest colour by more than 26 percentage points. Both films sit in the same category on a shelf. Only one of them supports the sentence.

The measured figures, film by film

FancyFix publishes the UV figure per line rather than per catalogue, and the spread below is the reason. Every number here is FancyFix's own measured value for stock product.

Solar control

Film	UV blocked
Adhesive solar-control film — all colours	99%
Static-cling solar film — black-grey silver	90.27%
Static-cling solar film — brown silver	88.34%
Static-cling solar film — blue silver	85.82%
Static-cling solar film — double-sided silver	72.42%

Privacy

Film	UV blocked
Blackout, whiteout, brushed black and mirror film	100%
White matte frosted	99%
Classic frosted	90%
Blinds film	87%
Reeded glass film — opaque and translucent	82%
Brushed silver	78%

Other constructions

Film	UV blocked
Photochromic film	97%
Reeded safety and security film	56%
Clear safety and security film	25%

The lowest figure in that list, 25%, belongs to a film nobody should be selling on UV. Clear safety and security film is bought for glass retention, and its 25% UV figure is the honest consequence of a construction optimised for something else — the same film measures 87% glare reduction, the highest in the FancyFix range. Publishing its real UV number is what lets a buyer stock it for the reason it works.

UV blocking and UV transmittance are two readings of the same test

UV blocking rate and UV transmittance are complementary figures, and on FancyFix static-cling solar film they add to exactly 100% on every colour. Double-sided silver blocks 72.42% and transmits 27.58%; brown silver blocks 88.34% and transmits 11.66%; blue silver blocks 85.82% and transmits 14.18%; black-grey silver blocks 90.27% and transmits 9.73%. A buyer who is handed only one of the two numbers can derive the other, which is a fast way to check whether a supplier's figures were measured or assembled. If a quoted blocking rate and transmittance do not close to 100%, they did not come from the same test.

The highest UV figure is not always the most durable film

Blocking UV and surviving UV are separate properties, and on FancyFix static-cling solar film they run in opposite directions at one end of the range. Blue silver blocks 85.82% of UV but is rated 2 for colour fastness to light on the scale used in FancyFix testing, while double-sided silver blocks the least UV in the line at 72.42% and is rated 4. Brown silver and black-grey silver are also rated 4. A buyer specifying for a sun-facing storefront needs the fastness rating as well as the blocking figure, because the film that admits less UV is not automatically the film that keeps its colour longest.

What a buyer does with a per-film figure

Print the figure for the SKU in the box, not the figure for the category. A pack that says 99% over a static-cling silver film that measures 72.42% is a claim a marketplace compliance team can ask you to substantiate, and the reseller carries that risk, not the factory. Sourcing teams working out which figure they are allowed to publish will find the verification steps in what to verify before you put a UV number on the pack; the heat and glare equivalents of this spread are in does reflective window film block heat. Film-by-film figures for the privacy range sit alongside the products on privacy window film, and the full range is on window film.

Stock figures, and where a programme needs different ones

Most FancyFix stock product sits within the parameters above, and those are the figures a buyer can plan a pack against. Where a programme needs a different construction or a different performance target, FancyFix produces to that specification instead — the stock table is a starting point for a private-label brief, not a fixed limit. Compliance documentation and test reports are prepared for your market and your product line, and where a programme requires them issued in FancyFix's own entity, FancyFix does that.

The bottom line

Ask a supplier for the UV figure on the specific film you are buying, and treat a single catalogue-wide percentage as unverified until it is broken out. FancyFix's own range spans 25% to 100% measured, which means any one number applied across all of it would be wrong for most of the films in it. The supplier who gives you a spread is giving you something you can print; the one who gives you a round number for everything is giving you something you will have to defend.

Tell us the film, the market and the claim you need to stand behind — we respond within 24 hours with the measured figures for that line.

FAQ

Do all window films block 99% of UV?

No. FancyFix measures UV blocking between 25% and 100% depending on the film's construction. Adhesive solar-control film blocks 99% across every colour, blackout and mirror films block 100%, static-cling solar film blocks 72.42% to 90.27%, and clear safety and security film blocks 25%. A single 99% figure applied to a whole catalogue does not survive being checked film by film.

How much UV does static cling window film block?

FancyFix static-cling solar film blocks between 72.42% and 90.27% of UV, measured per colour: double-sided silver 72.42%, blue silver 85.82%, brown silver 88.34%, and black-grey silver 90.27%. Static-cling privacy films measure differently again, from 78% on brushed silver to 100% on blackout, whiteout and mirror film. Static cling is an installation method, not a UV specification, so the figure has to come from the specific film.

What is the difference between UV blocking rate and UV transmittance?

UV blocking rate is the share of ultraviolet the film stops, and UV transmittance is the share it lets through, so the two add to 100% for the same film. On FancyFix static-cling solar film the pairs close exactly: 72.42% blocked with 27.58% transmitted, 88.34% with 11.66%, 85.82% with 14.18%, and 90.27% with 9.73%. If a supplier's two numbers do not add to 100%, they were not produced by the same measurement.