The Science Behind IR And UV Blocking With Car Sun Films
                     The Science Behind IR And UV 
Blocking With Car Sun Films
Car sun films are layers of protection that are designed to protect primarily your car, but 
in the process, you and your family too. That is because these films are designed to block 
the harmful UV (ultraviolet) rays and infrared (IR) heat of the sun, bringing in only the 
good amount of sunlight required. This keeps the car comparatively cooler than what it 
would be without any protective layers on the windows. But, this also safeguards 
everything within, from the interior components to the people within. Let’s understand 
the process in detail in the blow below.
How harmful are UV and IR?
If you think UV and IR are the same thing, hold on! While both UV and IR are radiations 
coming from the sun, and are both harmful, they aren’t actually the same. UV radiation 
has a short wavelength and high frequency, while IR radiation has a long wavelength and 
low frequency. UV radiation penetrates deep into materials, causing fading, cracking, 
degradation, and aging. This affects everything from the seats, dashboard, steering wheel, 
touchscreen display, and electronics to even those who are seated inside. IR radiation, on 
the other hand, is primarily responsible for heat buildup within the car. It doesn’t cause 
fading like UV radiation does, but it raises the temperature within, and stresses electronic 
components, which can cause slow performance, malfunctions, and premature failure.
What are sun films?
Sun films are highly engineered films, composed of multiple layers that each serve a 
specific purpose.
 At the very bottom comes the polyester base layer, which proves to be the 
structural backbone of the film. It is a thin and flexible, yet strong layer 
that resists tearing, and acts as a carrier for the other layers on top.
 Then  comes  the  UV-blocking  layer,  which  is  infused  with  UV-absorbing 
compounds like titanium dioxide or special polymers. This layer blocks up 
to 99% of UV radiation, protecting the interiors and reducing skin damage.
 Next comes the IR-reflective or IR-absorbing layer, which if often made of
metalized coatings or ceramic nanoparticles. This layer reflects or absorbs the IR 
radiation before it penetrates the interiors, keeping the interior temperature 
lower and reducing stress on sensitive components.
 Finally comes the top adhesive layer that bonds the film to the car’s window, and 
a protective topcoat which is a scratch-resistant layer that shields the film 
during cleaning or minor abrasion.
How sun films help block UV and IR
As we can see above, sun films have separate UV-blocking and IR-reflective/absorbing 
layers to deal with each type of radiation.
 The UV-blocking layer contains molecules that absorb the high-energy UV photons 
and release it as harmless heat within the film itself. This never lets the 
UV rays reach your car’s interiors. The best way to gain maximum benefits 
out of this layer is to choose films made of titanium dioxide or polyester 
polymers with UV stabilizers.
 The IR-reflective or IR-absorption layer can be made either of ceramic or nano- 
ceramic particles, or can come with a metalized coating. The 
ceramic/nano- ceramic particles are non-metallic heat-absorbing 
particles that scatter the IR radiation, offering heat reduction. On the 
other hand, films that come with a metalized coating can reflect IR 
radiation away from the cabin, reducing heat buildup within the car.
The different types of car sun films
There are a number of car sun film types available in the market. Ranging from basic 
dyed films to advanced ceramic coatings, each type serves a unique purpose, and comes 
with unique pros and cons.
 Dyed films
Dyed films are the cheapest option, but such films are prone to fading over time. 
Moreover, they offer minimal IR rejection and moderate UV blocking.
 Metalized films
Metalized films have a thin metal coating that can reflect heat, but these films may 
interfere with signals. However, they offer better IR rejection and UV protection than 
dyed films.
 Carbon films
Carbon films comprise of carbon particles that absorb IR and block the UV rays of the 
sun. They offer good heat rejection with negligible fading of the film’s colour.
 Ceramic/nano-ceramic films
These films comprise of non-metallic high-tech particles that block both UV and IR rays 
with no signal interference. They also offer superior heat rejection and durability.
Understanding these differences helps you choose a sun film that truly delivers on what 
you’re paying for – effective UV and IR protection, clarity, and lasting value.
Identifying marketing gimmicks
You will notice a number of extravagant claims across the market when you’re searching 
for car sun films. This can have you be easily misled by such marketing exaggerations. 
Here are a few gimmicks you need to keep yourself away from.
 “Metal-free” ≠ “High protection”: Certain brands advertise non-metal films as 
being superior, yet many of these provide inadequate infrared rejection. 
Always check the actual IR-blocking specifications.
 “Blocks 100% heat” – This should raise a warning, as no transparent film can 
completely block heat; the highest quality films can also block only 
between 50– 70% of infrared radiation.
 Ambiguous UV protection claims – Avoid settling for vague phrases like “UV 
resistant”. Rather, look for quantifiable data, such as “99% UV rejection”, 
which is
the genuine industry standard.
 Cost vs. effectiveness – Extremely low-priced options often lack advanced ceramic 
or nano layers, leading to subpar heat rejection and rapid fading.
 Warranty statements – A lengthy warranty may indicate confidence, but always
verify what it specifically covers like bubbling, discoloration, or delamination.
How to choose the right sun film
When choosing a car sun film, several factors should guide your decision. Begin by 
assessing your climate – vehicles in hot regions will require films with higher infrared 
(IR) rejection to maintain cooler interiors. Additionally, take into account your car’s 
technology; if it uses signal-sensitive electronics such as GPS or keyless entry, steer clear 
of metalized films that may cause interference. Always adhere to local regulations 
concerning Visible Light Transmission (VLT) to ensure safety and legality while driving. 
Although it might be tempting to opt for less expensive alternatives, it is essential to 
prioritize quality, as budget films frequently fall short in providing long-term UV and IR 
protection. So, prioritize premium sun films for car in Jayanagar like the ones offered 
by Autopad to ensure long-term UV and IR protection. Finally, check warranties and 
certifications like ISO or those backed by manufacturers to guarantee authenticity and 
performance.
The benefits of sun films go well beyond aesthetics or privacy. By integrating UV 
absorption with IR reflection/absorption, modern car sun films serve as an invisible 
barrier, protecting the interiors, electronics, and passengers. Understanding the science 
behind IR and UV blocking enables you to make informed choices, sidestepping 
marketing ploys, and investing in films that genuinely safeguard your vehicle. Regardless 
of whether you own a technology-rich sedan, a high-end SUV, or an electric car, choosing 
the right sun film guarantees comfort, efficiency, and durability for many years ahead.
Resource : The Science Behind IR And UV Blocking With Car Sun Films