Cosmo Sunshield Window Films Guide: Types, VLT Law & Specs

Every car and every building in India shares the same weak point: its glass. Glass gives a car its sense of space and a home its view, but it also lets the sun straight in. Park a car in the open on a May afternoon and within the hour the steering wheel is too hot to hold, the dashboard is baking and the air conditioner needs ten minutes just to make the cabin bearable. Step into a glass-fronted office at three in the afternoon and the blinds are down, the lights are on and the cooling bill keeps climbing.

Most of that heat is invisible. Roughly half of the sun's energy arrives as infrared radiation, which is what turns a cabin or a room into an oven. Another few percent arrives as ultraviolet, which fades dashboards, leather, wooden floors and fabrics, and reaches skin through glass more easily than most people realise. A study published in JAMA Ophthalmology measured 29 cars and found that while windscreens blocked about 96% of UVA on average, side windows blocked only 71%, and some as little as 44%. In India the driver sits on the right, so it is the right arm and the right side of the face that absorb that exposure on every drive.

Window film fixes this at the glass itself, without replacing a single pane. It is a precision-engineered, multi-layer polyester film applied to existing glass that rejects infrared heat, blocks more than 99% of UV, cuts glare, adds privacy and holds shattered glass together. Modern films can deliver significant heat, UV, glare, privacy and safety benefits while maintaining the level of clarity or appearance the application requires, from near-clear nano-ceramic films to reflective, tinted and frosted finishes.

This guide from Cosmo Sunshield covers everything you need to know: how window film works, the technologies behind it, the legal position for cars in India, the full Cosmo Sunshield automotive and architectural range, how to choose the right film, and how it should be installed and cared for.

Understanding Window Film

What is window film?

Window film is a thin, multi-layer polyester (PET) film applied to the inside surface of glass in cars and buildings. It turns ordinary glass into a performance surface that controls how much heat, UV and visible light pass through, and it can add privacy, safety and style.

Every quality film is built in layers, and each layer has a job:

• Polyester base. Gives the film its strength, stability and optical clarity.
• Functional layer. Dyes, carbon pigments, metal particles or nano-ceramic particles that decide how the film handles heat, light and UV.
• Adhesive. Bonds the film to the glass and holds the glass together if it breaks.
• Scratch-resistant hard coat. Protects the exposed surface against daily wear and cleaning.

How does window film work?

Sunlight reaches glass as three kinds of energy: ultraviolet, visible light and infrared. When it strikes a window film, part of that energy is reflected, part is absorbed and part passes through. The functional layer decides the balance.

• Ultraviolet is blocked by UV absorbers built into the film. Cosmo Sunshield films block more than 99% of UV.
• Infrared, the main source of heat, is absorbed or rejected by carbon, metal or nano-ceramic particles. Nano-ceramic films target infrared specifically, which is why a clear film can still reject most of the heat.
• Visible light is controlled by the shade of the film. A lighter film keeps glass bright; a darker film cuts glare and adds privacy.

This is the principle of spectral selectivity: stop the energy you don't want, and let through the light you do.

Benefits of window film

• Heat rejection. Keeps cabins and rooms cooler and reduces the load on air conditioning.
• UV protection. Prolonged UV exposure can accelerate fading, discolouration and degradation of interiors and furnishings. Blocking more than 99% of UV helps protect skin and interiors from that exposure.
• Glare reduction. Cuts harsh sunlight and headlight glare, reducing eye strain and fatigue.
• Energy savings. Lower cooling loads mean lower electricity bills in buildings and better fuel efficiency in cars.
• Privacy. Tinted, reflective and frosted finishes limit the view in while keeping natural light.
• Safety and security. Holds shattered glass together, reducing injuries from flying fragments and slowing down break-ins.
• Style. Gives glass a clean, uniform, premium finish.

Key performance terms: VLT, IRR, TSER and UV

Every film is described by a few numbers. Knowing them makes it easy to compare films accurately.

Always compare like with like: IRR against IRR, TSER against TSER.

Automotive Window Film

A car is a small space enclosed in glass, parked in the sun for hours. That makes window film one of the most valuable upgrades an Indian car owner can make.

Types of automotive film

The technology inside a film decides how well it performs and how long it lasts.

Dyed film

A dye layer absorbs solar energy. Dyed film is economical, but it offers limited heat rejection and fades over time, often turning purple or patchy.

Metallised film

Metal particles reflect heat, giving good heat rejection and a shiny finish. The metal can interfere with GPS, mobile signals, keyless entry and tyre-pressure sensors, which matters in a modern car full of electronics.

Carbon film

Carbon pigments absorb infrared and hold their colour. Carbon film has a matte, colour-stable tint, resists fading, reduces glare well and contains no metal, so signals pass freely. Cosmo Sunshield Carbomax uses carbon pigment technology.

Nano-ceramic film

Non-metallic ceramic nanoparticles target infrared heat while letting visible light through. Nano-ceramic film delivers high heat rejection with excellent clarity, and no signal interference. Cosmo Sunshield CoolMax uses nano-ceramic technology.

Film type	Heat rejection	Signal friendly	Colour stability	Clarity
Dyed	Low	Yes	Fades over time	Moderate
Metallised	High	No	Good	Reflective
Carbon	Moderate	Yes	High	Good, matte tint
Nano-ceramic	Very high	Yes	Very high	Excellent

Why people use automotive film

• A cooler cabin. Infrared rejection keeps the interior cooler when parked and while driving, so the AC cools the car faster.
  
• Better fuel efficiency. Less AC load means less fuel in a petrol or diesel car, and less battery drain and better range in an EV.
• Skin and eye protection. More than 99% UV rejection closes the gap left by side windows on every commute.
• A car that stays new. Prolonged UV exposure can accelerate fading, discolouration and degradation of dashboards, leather, fabric and trims. Blocking more than 99% of UV helps protect the interior from prolonged exposure, and with it the car's resale value.
• Less glare, less fatigue. Reduced glare from sun and oncoming headlights keeps the driver alert on long drives.
• Safety and security. Window safety glazing holds shattered glass together in an accident and slows down smash-and-grab theft.
• A premium look. A well-matched film gives every window a clean, uniform finish.

India's legal position

The law in India sets clear limits on how much light car glass must let through. Understanding them lets you enjoy the benefits of film with confidence.

The VLT limits. Rule 100 of the Central Motor Vehicles Rules, 1989 sets minimum visible light transmission for vehicle glass:

Window	Minimum VLT
Front windscreen	70%
Rear windscreen	70%
Side windows	50%

The Supreme Court order, 2012. In Avishek Goenka v. Union of India (27 April 2012), the Supreme Court prohibited black films of any VLT, and any other material, on vehicle glass across the country. It directed traffic police to challan offending vehicles and remove such films.

The 2021 amendment. An amendment to Rule 100, effective 1 April 2021, allowed "safety glazing" to be used in place of safety glass on the windscreen, rear window and side windows, provided it conforms to IS 2553 (Part 2) (First Revision): 2019 and meets the VLT limits.

The Kerala High Court ruling, 2024. In M/s. George & Sons v. Union of India (2024:KER:68346), decided on 10 September 2024, the Kerala High Court held that authorities cannot penalise owners of vehicles fitted with safety glazing that conforms to IS 2553 (Part 2): 2019 and provides at least 70% VLT on the windscreen and rear window and 50% on the side windows. The Court also noted that nothing in the amended rule prevents the owner from installing such glazing.

What this means for you. The direction of the law is clear: window safety glazing within the VLT limits is recognised; dark and black films are not. Enforcement practice still differs between states, so follow these rules to stay on the right side of it:

• Choose window safety glazing in a shade that keeps every window within its VLT limit. Every Cosmo Sunshield automotive film is designed as window safety glazing.
• Remember that the law measures the finished window: glass and film together. Factory glass is rarely perfectly clear, so the finished reading will be a little lower than the film's own VLT.
• Ask your installer to measure each finished window with a VLT meter, and keep the film's specification and invoice in the car.
• Never fit black, dark, reflective or mirror film on road glass.
• Confirm current enforcement practice in your state with your installer.

Film choices at a glance

Choice	Status	Why
Black or dark tint	Not permitted	Below the VLT limits and prohibited under the 2012 Supreme Court order
Mirror or reflective film on road glass	Not permitted	Fails the VLT limits and creates glare for other road users
Window safety glazing within 70% / 50% VLT	Recognised under the amended framework	Recognised by the 2021 amendment and addressed in the 2024 Kerala ruling; enforcement varies by state
Factory-tinted glass within VLT limits	Compliant	Meets Rule 100 as manufactured

Choosing the Right Automotive Film

Cosmo Sunshield automotive films come in three tiers. Each tier has a dedicated film for the front windscreen and one for the sides and rear, so every window gets a shade matched to its legal limit. Every film is window safety glazing with more than 99% UV rejection.

CoolMax: nano-ceramic technology (Luxury tier)

CoolMax is the flagship of the Cosmo Sunshield automotive range. Its nano-ceramic technology rejects infrared heat without metal, so the film stays clear, keeps the cabin noticeably cooler and leaves GPS, mobile and in-car signals untouched.

• Up to 90% infrared heat rejection on the front (Prime) and up to 95% on the sides and rear (Guard)
• More than 99% UV rejection
• Better fuel efficiency through reduced AC load
• Anti-graffiti and scratch-resistant coating
• Long life with proper care: up to 8 years in some cases

CoolMax Prime (Front)

Engineered for the front windscreen, where the law demands the most light, CoolMax Prime combines high clarity with strong heat rejection.

CoolMax Prime	VLT	TSER	IR heat rejected (up to)	UV rejected
Prime 80	80%	35%	75%	>99%
Prime 70	70%	50%	90%	>99%

The 80% variant gives extra headroom on windscreens where the factory glass already cuts some light, helping the finished window stay above the 70% limit.

CoolMax Guard (Side and Rear)

Engineered for the side and rear glass, CoolMax Guard offers a deeper 50% shade for side windows and delivers the highest heat rejection in the Cosmo Sunshield automotive range.

CoolMax Guard	VLT	TSER	IR heat rejected (up to)	UV rejected
Guard 80	80%	35%	75%	>99%
Guard 70	70%	50%	90%	>99%
Guard 50	50%	55%	95%	>99%

Use Guard 70 or 80 on the rear windscreen, which carries the same 70% limit as the front. Guard 50 is designed for side windows.

Made for: premium and luxury cars, long daily drives, EV owners protecting range, and anyone who wants maximum cabin comfort with a clear, factory look.

Carbomax: carbon pigment technology

Carbomax uses carbon pigments rather than dyes or metal. Carbon absorbs infrared and holds its colour, giving a colour-stable tint that resists fading for years, with high glare reduction and clear signal connectivity.

• High glare reduction: up to 45% on Carbomax Guard 50
• Colour-stable, fade-resistant tint
• High durability
• Clear signal connectivity
• Anti-graffiti window safety glazing with more than 99% UV rejection

Carbomax Prime (Front)

IR heat rejection up to 30% and glare reduction up to 25%.

Carbomax Prime	VLT	TSER	Glare reduction (up to)	UV rejected
Prime 70	70%	25%	25%	>99%

Carbomax Guard (Side and Rear)

IR heat rejection up to 35% and glare reduction up to 45%.

Carbomax Guard	VLT	TSER	Glare reduction (up to)	UV rejected
Guard 70	70%	25%	25%	>99%
Guard 50	50%	30%	45%	>99%

Made for: drivers who want a sleek, fade-resistant tint and strong glare control, with no signal interference.

Defender (Front)

Defender is long-life window safety glazing for the front windscreen, with a scratch-resistant coating, longer colour life, good glare reduction and more than 99% UV rejection.

Defender	VLT	TSER	UV rejected
Defender 70	70%	20%	>99%

Maxtone (Side and Rear)

Maxtone is Defender's partner for the side and rear glass: long-life window safety glazing with a scratch-resistant coating, longer colour life, good glare reduction and more than 99% UV rejection.

Maxtone	VLT	TSER	UV rejected
Maxtone 70	70%	20%	>99%
Maxtone 50	50%	25%	>99%

Defender and Maxtone are made for: everyday cars and first-time film buyers who want dependable UV protection, glare control and safety.

Which film for which window?

Your priority	Front windscreen	Side windows	Rear windscreen
Maximum heat rejection and comfort	CoolMax Prime 70 or 80	CoolMax Guard 50 or 70	CoolMax Guard 70 or 80
Fade-resistant style and glare control	Carbomax Prime 70	Carbomax Guard 50 or 70	Carbomax Guard 70
Everyday UV and glare protection	Defender 70	Maxtone 50 or 70	Maxtone 70

Your installer will confirm the final shade for each window after measuring the VLT of your car's factory glass.

Cosmo Sunshield automotive range compared

Film	Technology	Position	VLT options	TSER (up to)	IR rejection (up to)	Glare reduction (up to)	UV rejected
CoolMax Prime	Nano-ceramic	Front	70%, 80%	50%	90%	–	>99%
CoolMax Guard	Nano-ceramic	Side + rear	50%, 70%, 80%	55%	95%	–	>99%
Carbomax Prime	Carbon pigment	Front	70%	25%	30%	25%	>99%
Carbomax Guard	Carbon pigment	Side + rear	50%, 70%	30%	35%	45%	>99%
Defender	Long-life safety glazing	Front	70%	20%	–	25%	>99%
Maxtone	Long-life safety glazing	Side + rear	50%, 70%	25%	–	40%	>99%

For complete exterior protection, pair window film with Cosmo PPF, a self-healing paint protection film that guards paint against scratches, stone chips and UV.

Architectural Window Film

What is architectural film?

Architectural window film is applied to the glass of homes, offices, shops and commercial buildings. It rejects heat, blocks UV, cuts glare, adds privacy and holds broken glass in place, all without replacing the glass.

Glass is the largest source of unwanted heat gain in most Indian buildings. Film stops that heat at the source, which lowers the load on air conditioning, keeps rooms comfortable right up to the window and protects everything inside from UV. Cosmo Sunshield architectural films can save up to 10% on electricity bills, depending on glass area, orientation and climate. Try the Cosmo Sunshield Energy Saving Calculator on cosmoconsumer.com to estimate the savings for your building.

Film is also a practical route to better building performance. India's Energy Conservation Building Code (ECBC 2017), the residential Eco-Niwas Samhita 2018 and the Energy Conservation and Sustainable Building Code (ECSBC 2024) all treat glazing as a major source of heat gain. Film lowers the solar heat gain of glass already in place, which makes it one of the most cost-effective retrofits available. Your energy consultant can model the effect on your building's envelope.

Where it is used

• Homes and apartments. Living rooms, bedrooms, balconies and west-facing windows that overheat in the afternoon.
• Offices and commercial facades. Glass-heavy buildings where solar gain drives cooling costs and glare makes screens hard to read.
• Hospitality. Hotel rooms, lobbies and restaurants that want comfort and views together.
• Retail storefronts. Protecting merchandise from fading while keeping displays on view.
• Schools and hospitals. Safety against broken glass and privacy for consultation rooms.
• Skylights and glass roofs. The spaces that take the most direct sun.
• Railways and marine facilities. Transport and maritime glazing under intense sun.

Every Cosmo Sunshield architectural film carries a scratch-resistant coating and anti-graffiti properties, and the range is designed not to interfere with Wi-Fi.

Heat-control films

Ultra Cool

Ultra Cool is the premium Cosmo Sunshield heat-control range, built for architects, specifiers and homeowners who don't want to trade daylight for comfort. This sun control film spectrally selective nano-ceramic technology targets infrared heat while letting visible light through, so glass stays clear and views stay open. It is non-metallic, low-reflective and Wi-Fi friendly.

• Up to 95% infrared heat rejection
• More than 99% UV rejection on most variants
• Visible light transmission options from 5% to 85%
• SHGC from 0.31 to 0.71, depending on the variant
• 2-ply, 1.5 mil construction, in transparent and graphite shades
• Suitable for double-glazed, laminated and low-E glass once the glass has been assessed, and for skylights and glass roofs

Ultra Cool variant	Shade	VLT	IR heat rejected	TSER	SHGC
CS-650-IT-8560	Transparent	85%	59%	29%	0.71
CS-650-CT-8065	Transparent	83%	65%	32%	0.68
CS-650-AC 7465	Transparent	74%	65%	37%	0.63
CS-650-AC 7090	Transparent	70%	93%	49%	0.52
CS-601-PACGP-5095	Graphite	57%	92%	52%	0.48
CS-650-PAC-5075	Transparent	54%	75%	46%	0.55
CS-600-PAC-3090	Transparent	30%	90%	60%	0.41
CS-601-PACGP-0595	Graphite	5%	95%	70%	0.31

The 7090 shows what spectral selectivity makes possible: it passes 70% of visible light and still rejects 93% of infrared heat. The 85% and 83% variants are near-clear on the glass, while lower-VLT variants such as the 3090 and 0595 add greater total solar rejection, glare control and privacy.

Made for: commercial facades, hospitality interiors, green-building projects, premium homes, skylights and glass roofs.

Rainbow

Rainbow uses nano-pigment technology to deliver economical heat rejection in a non-reflective finish, across a range of shades. It combines protection and cool comfort at an accessible price point, and doubles as a privacy film.

Made for: homes and offices that want heat control and a tinted look without a mirror finish.

Luster

Luster is a reflective sun-control film with a nonfading metallic finish. It keeps heat outside with a low solar heat gain coefficient and adds strong daytime privacy through its subtle mirror effect, in a variety of shades.

Made for: street-facing homes, commercial facades and offices that want heat rejection and daytime privacy in one film.

Safety and security films

Safeguard

Safeguard is a transparent, tear-resistant safety film designed to hold shattered glass together. If the glass breaks from impact, accident, storm or an attempted break-in, the pieces stay bonded to the film instead of scattering, reducing the risk of injury and slowing down forced entry.

• Constructions from 4 mil and 7 mil up to 11 mil; thicker film gives greater holding strength
• Highly transparent: the clear variants leave the glass looking unchanged
• More than 99% UV rejection
• Scratch-resistant coating rated above 3H pencil hardness
• Peel strength above 2,600 g/inch with an acrylic pressure-sensitive adhesive
• Anti-graffiti properties
• A 4 mil variant with 93% infrared heat rejection, for glass that needs safety and heat control in one film

Made for: homes, offices, schools, hospitals, commercial buildings, ground-floor glazing and storefronts.

Privacy films

Cosmo Sunshield privacy films limit the view in while keeping natural light, delivering up to 95% privacy.

Sunbrella

Sunbrella offers more than 99% UV protection, glare reduction and privacy in a choice of shades and colours. It is the preferred film for interior glass and wherever heat rejection is not the main goal.

Made for: internal partitions, cabins, meeting rooms and interior doors.

Rainbow

Rainbow's nano-pigment tint limits the view in while adding heat rejection, in a non-reflective finish.

Made for: home offices, bedrooms and spaces that need privacy and comfort together.

Luster

Luster's one-way mirror effect gives strong daytime privacy: the outside sees a reflective surface while the inside keeps its view.

Made for: street-facing rooms, ground-floor offices and storefronts.

Frosted and decorative films

Frosted films blur the view in both directions, day and night, while letting light through. Decorative films add patterns, gradients, bands and custom designs, including company logos.

Made for: bathrooms, glass doors, conference rooms, reception areas, clinics and branded office partitions.

Choosing Architectural Film

The right film starts with the job the glass needs to do. Work through these seven questions with your Cosmo Sunshield dealer.

Heat

If the room overheats, choose a heat-control film. Ultra Cool gives the highest infrared rejection in the range while keeping glass clear. Rainbow offers economical heat rejection with a tint, and Luster adds a reflective finish with a low SHGC.

Privacy

Decide when you need privacy. Luster and other one-way reflective films work in daylight, when the outside is brighter than the inside; after dark, with lights on indoors, pair them with blinds or curtains. For privacy around the clock, choose frosted or decorative film. For interior partitions, Sunbrella is the natural choice.

Safety

For ground-floor glass, storefronts, schools, hospitals and any glass near people, choose Safeguard. The thicker the film, the greater the holding strength, so match the construction (4, 7 or up to 11 mil) to the risk.

Glass type

Identify whether the glass is single, double-glazed, laminated, tempered or low-E. The glass type decides which films are suitable. Ultra Cool can be applied on double-glazed, laminated and low-E glass once the glass properties have been assessed.

VLT

Higher VLT keeps rooms bright and views natural; Ultra Cool offers options up to 85%. Lower VLT gives more glare control and privacy. For offices with screens, a mid-range VLT often gives the best balance.

Solar exposure

East- and west-facing glass takes the harshest, low-angle morning and afternoon sun and gains the most from heat-control film. Skylights and glass roofs take direct overhead sun and need high infrared rejection.

Thermal stress

Film absorbs part of the sun's energy, which warms the glass. On large panes, dark or highly absorbing film can heat the glass unevenly and, in the wrong combination, cause it to crack. That is why a professional installer assesses the glass type, size and exposure before recommending a film. Spectrally selective films such as Ultra Cool reject heat with lower absorption, which makes them well suited to large glazing.

Installation & Care

Professional installation is the standard for every Cosmo Sunshield film, and it is essential for car windscreens, large panes, safety film and double-glazed, laminated or low-E glass. Here is what a proper installation involves.

Assessment

• Inspect the glass. Check for cracks, chips, failed seals in double-glazed units and damaged frames. Film should go on sound glass.
• Match the film to the glass. Confirm the chosen film suits the glass type, size and sun exposure.
• Measure the factory VLT (cars). This decides which shade keeps each window within the legal limit.
• Prepare the space. Install in a clean, dust-free, well-lit area, away from wind and direct sun.

Installation

Tools used by a professional installer: a precision cutting knife with fresh blades, rubber and hard-card squeegees, a spray bottle of mounting solution, lint-free cloths, a glass scraper, a measuring tape, a heat gun for curved car glass and a VLT meter.

1. Clean the glass thoroughly. Remove all dust, grease, paint specks and residue, scraping the bare glass and wiping the edges and corners. Any speck left behind will show under the film.
2. Prepare the mounting solution. Mix mild soap and water at a ratio of 1:10 in a spray bottle.
3. Measure and cut. Cut the film slightly larger than the glass, leaving a margin for trimming.
4. Shape the film on curved glass. For car rear windscreens and other curved glass, the installer heat-shapes the film on the outside of the glass so it matches the curve exactly.
5. Peel the liner and spray. Remove the liner from the adhesive side while spraying it with solution, and spray the glass generously.
6. Position the film. Lay the wet adhesive side on the glass. The solution lets the film slide into exact position.
7. Squeegee out water and air. Work from the centre outwards with firm, overlapping strokes.
8. Trim the edges. Trim the excess neatly, leaving a small gap from the frame or seal so the edges dry and stay down.
9. Final pass. Squeegee once more and wipe the edges dry.
10. Verify. For cars, measure the finished VLT of each window with a meter. For buildings, check the whole surface for trapped debris or bubbles.

Curing

Allow 3 to 5 days for the film to cure fully; it can take a little longer in cool or humid weather. During this time:

• Do not clean or touch the film.
• In cars, keep the windows rolled up.
• Small water pockets or a light haze are a normal part of curing and disappear as the film dries.

Cleaning

• Use a soft microfibre cloth or squeegee with a mild, ammonia-free cleaner. Ammonia can degrade the film and adhesive over time.
• Never use blades, scrapers or abrasive pads on the film.
• In cars, take care with seat-belt buckles, rings and keys near the glass.
• Clean gently and regularly; the scratch-resistant coating keeps the surface clear.

Troubleshooting

• Small bubbles after curing. Push them towards the nearest edge with a soft squeegee or a microfibre-wrapped card.
• Lifting edges. Apply a little mounting solution under the edge and press it firmly back into place.
• Widespread peeling, heavy bubbling or discolouration. The film should be removed and replaced. These are signs of poor installation or low-grade film.

Replacement

When a film reaches the end of its life, or your needs change, a trained installer removes it using heat and a scraper to soften the adhesive and lift the film cleanly, without harming the glass. Any adhesive residue is cleaned off before new film is applied.

Window Films Frequently Asked Questions

1. What is window film used for?

Window film controls heat, UV, glare, privacy and safety on existing glass. Cars use it to keep the cabin cooler, protect passengers and interiors, and hold glass together in an accident. Buildings use it to cut solar heat gain and cooling costs, protect furnishings, add privacy and improve safety, without replacing any glass.

2. Is car window film legal in India?

Rule 100 requires at least 70% VLT on the front and rear windscreens and 50% on the side windows. The 2021 amendment recognises safety glazing that meets IS 2553 (Part 2): 2019 and these limits, and the Kerala High Court held in 2024 that such glazing cannot be penalised. Black and dark films remain prohibited under the Supreme Court's 2012 order. Choose window safety glazing within the VLT limits, have your installer measure each window and keep your documentation. Enforcement practice varies by state.

3. What is the difference between VLT, IRR and TSER?

VLT is how much visible light passes through. IRR is how much infrared heat is rejected. TSER is the share of all solar energy rejected. A clear nano-ceramic film can have a very high IRR with a lower TSER, because it deliberately lets visible light in.

4. Nano-ceramic or carbon: which should I choose for my car?

Choose nano-ceramic CoolMax for maximum heat rejection, up to 95% infrared on CoolMax Guard, with excellent clarity. Choose carbon Carbomax for a colour-stable, fade-resistant tint with strong glare reduction, up to 45%. Both are signal friendly.

5. Does window film interfere with GPS, mobile or Wi-Fi signals?

Metallised films can. Nano-ceramic and carbon films contain no metal, so signals pass freely. Cosmo Sunshield CoolMax, Carbomax and Ultra Cool films are signal friendly.

6. Will window film improve my car's fuel efficiency?

Yes. By rejecting infrared heat, the film reduces the load on the air conditioner, which means less fuel in a petrol or diesel car and less battery drain in an EV.

7. My car already has glass. Why do I need UV protection?

Windscreens block most UVA, but side windows often don't. A JAMA Ophthalmology study found side windows blocked only 71% of UVA on average, and some as little as 44%. Every Cosmo Sunshield film blocks more than 99% of UV.

8. How much heat does window film reject in homes and offices?

Cosmo Sunshield Ultra Cool rejects up to 95% of infrared heat, and variants such as the 7090 reject 93% while letting 70% of visible light through. Actual indoor temperature reduction depends on glass area and sun exposure.

9. How much electricity can window film save?

Cosmo Sunshield architectural films can save up to 10% on electricity bills, depending on glass area, orientation, climate and air-conditioning use. Use the Energy Saving Calculator on cosmoconsumer.com for an estimate.

10. Can film be applied on double-glazed, laminated or low-E glass?

Yes, once the glass has been assessed. Ultra Cool can be applied on double-glazed, laminated and low-E glass after the installer checks the glass properties, which ensures the right film is matched to the glazing.

11. Does one-way mirror film give privacy at night?

One-way film gives privacy when the outside is brighter than the inside, which makes it ideal in daytime. After dark, with lights on indoors, pair it with blinds or curtains, or choose frosted film for privacy around the clock.

12. What does safety film do when glass breaks?

Safety film such as Cosmo Sunshield Safeguard holds the shattered pieces together so fragments don't scatter, reducing injuries and slowing forced entry. Safeguard comes in constructions up to 11 mil; thicker film gives greater holding strength.

13. How long does window film take to cure, and how do I clean it?

Allow 3 to 5 days for full curing. After that, clean with a soft cloth and a mild, ammonia-free cleaner, and keep blades and abrasive pads away from the film.

14. How long does car window film last?

With proper care, CoolMax can last up to 8 years in some cases. Carbon and nano-ceramic films hold their colour far longer than dyed films.

15. Which Cosmo Sunshield film is right for me?

For cars: CoolMax for maximum heat rejection, Carbomax for fade-resistant style and glare control, and Defender with Maxtone for everyday protection. For buildings: Ultra Cool, Rainbow and Luster for heat control; Safeguard for safety and security; and Sunbrella, Rainbow, Luster and frosted or decorative films for privacy.

Cosmo Sunshield

Cosmo Sunshield is the window film brand of Cosmo Consumer, a business unit of Cosmo First Limited. Its films are manufactured in-house at Aurangabad, Maharashtra, and built on nanotechnology for high heat rejection, UV protection and privacy across automotive and architectural glass.

The range covers every need on the glass:

• For cars: CoolMax (nano-ceramic), Carbomax (carbon pigment), and Defender and Maxtone (long-life safety glazing), each with dedicated films for the front and for the sides and rear.
• For buildings: Ultra Cool, Rainbow and Luster for heat control; Safeguard for safety and security; and Sunbrella, Luster, Rainbow and frosted and decorative films for privacy.

Every film blocks more than 99% of UV, and every automotive film is designed as window safety glazing. Alongside Cosmo PPF and Cosmo Guard, Cosmo Sunshield completes Cosmo Consumer's surface protection range for cars and buildings.

Find the right film for your car, home or office. Explore the range at cosmoconsumer.com/cosmosunshield, estimate your savings with the Energy Saving Calculator, or call 1800 57 00057 to speak to a Cosmo Sunshield expert.