How does ceramic tint keep heat out?
By stopping a large share of the sun’s infrared, the part of sunlight you feel as warmth rather than see. LLumar calls IRX an “infrared-rejecting” nano-ceramic film, and its performance data sheet measures that infrared over 780 to 2,500 nm. A ceramic film does it with very little shine: IRX reflects only 5 to 7% of visible light, the same as dyed ATC.
Because the film isn’t a mirror, it doesn’t bounce all of that energy away. Some is absorbed in the film and glass, which warm up and then give part of that heat off again, some of it toward the cabin. That’s why LLumar publishes two infrared numbers, and why the honest answer to “does it really work?” depends on which one you read.
Which heat number should you trust?
Total solar energy rejected (TSER) for comparing films, and IR energy rejection (IRER) for the infrared alone. The sheet’s own footnotes explain the gap. IRER counts “absorbed and re-radiated energy”, and the sheet’s term for it is “a more complete measurement” of the heat you feel from the sun’s infrared. SIRR measures only the infrared “not directly transmitted through glass”, which is why it’s the bigger number.
| LLumar film | TSER | IRER | SIRR | Visible light let through |
|---|---|---|---|---|
| IRX 05, ceramic | 62% | 60% | 86% | 6% |
| IRX 15, ceramic | 59% | 61% | 88% | 20% |
| IRX 50, ceramic | 50% | 60% | 87% | 54% |
| ATC 05, dyed | 44% | 22% | 29% | 5% |
| ATC 35, dyed | 35% | 22% | 29% | 38% |
| AIR 80, clear ceramic | 43% | 60% | 86% | 77% |
| AIR 90, clear ceramic | 30% | 40% | 57% | 84% |
Read across the IRX rows and the difference is plain. Close to nine-tenths of the infrared doesn’t pass straight through, but once the heat the film absorbs and re-radiates is counted, about six-tenths is kept out. That’s still nearly three times dyed ATC’s 22%, and it’s the figure to use when someone quotes “88% heat rejection”.
Is it the ceramic or the darkness that blocks heat?
Mostly the infrared-blocking material, not the shade. Three comparisons from the same sheet make the point:
- Light ceramic beats dark dye. IRX 50 is more than ten times as bright to look through as ATC 05 (54% visible light against 5%), yet it turns away more total solar energy, 50% against 44%.
- Clear ceramic matches dark ceramic on infrared. AIR 80, which transmits 77% of visible light, rejects 60% of infrared energy by IRER, the same as IRX 05.
- Clear without ceramic does little. LLumar’s clear UV film, AU 85, rejects 20% of total solar energy and 22% of infrared, which shows how much more AIR’s ceramic construction delivers.
Ceramic isn’t the only route. LLumar’s metallized ATR 05 rejects 61% of total solar energy, almost level with IRX 05, but LLumar describes ATR as having “a slightly reflective look”, and the sheet pitches its CTX ceramic line on heat rejection “without blocking electronic signal transmission”. The shop carries IRX and AIR as its ceramic options.
Where does ceramic tint fall short?
On glass it can’t legally cover, and on numbers that come from test glass rather than your car. Every figure above was measured under NFRC procedures on one 6 mm pane of clear glass, and LLumar says real performance varies with the glass type. Factory privacy glass, for example, already absorbs some of the sun’s energy before any film is added.
In BC, the bigger limit is the law. Under MVAR s. 7.05(8), film is legal on glass behind the driver, on the rear window of a car carrying two outside mirrors, and in a band across the windshield’s top 75 mm. Most of the windshield and both front door windows have to stay bare, so sun through them reaches the front seats whatever is on the rear glass. The shop does fit front door and windshield film when asked, but no shade of it is road-legal in BC, clear AIR included; a $109 ticket, a Notice & Order to remove it and a failed inspection can follow, and that’s explained before anyone books.
The spec sheet also doesn’t promise a cabin temperature. LLumar’s FAQ says its tint keeps interiors “considerably cooler”, but no published number says by how many degrees, and we won’t invent one.
Does ceramic tint make sense for a Fraser Valley summer?
For long summer days in the car, yes. Environment Canada’s 1981 to 2010 climate normals for Abbotsford Airport give average daily highs of 24.0 °C for July and 24.4 °C for August; on average 8.7 days a year top 30 °C, and the station logs 1,886.7 hours of sun a year. Vancouver Airport’s July high averages 22.2 °C, so the valley runs warmer than the coast.
Who gets the most from the upgrade, and when dyed film is enough, is covered in whether ceramic tint is worth it. For a straight comparison of the two film types, see ceramic vs dyed window tint.
Getting ceramic film on the glass you can tint
Choose IRX for heat with a tinted look, or AIR for heat and UV with almost no change in appearance. IRX comes in 5, 15, 35 and 50%; AIR is listed by the shop in 70, 80 and 90%, and the sheet publishes figures for AIR 80 and AIR 90 only. Both are quoted as upgrades on the rear packages, whose dyed-ATC starting prices are $220, $240 and $260 for a sports coupe, a sedan or pickup, and a full-size SUV or wagon.
Ceramic jobs are usually same-day work, and the shop backs film and labour with a lifetime warranty. The film lines are compared on ceramic window tint and LLumar IRX. For a ceramic quote on your car, fill in the ceramic tint quote form or ring 604 534 6433.
