Users pay little attention to these parameters when applying heat-insulating film to cars.

Car heat-insulating film is an increasingly popular and indispensable accessory for car users because of its effects of heat resistance, protection against harmful rays and reducing glare from oncoming vehicles.

However, today users can find and be introduced to dozens of heat-insulating film brands available on the market with a variety of types, origins and prices. Every brand has the slogan: “The best heat-insulating film”. So, based on what factors can we affirm that “This is the best heat-insulating film”?

Users easily get lost in the "matrix" of heat-insulating film brands.

Mr. Le Van Hung - BSM Tintcar center specializing in distributing heat-insulating films in Hanoi said that users need to pay special attention to 2 main factors when choosing to buy heat-insulating films including: Product origin and heat-insulating ability of the film (based on the indexes).

Product origin

Currently, on the market there are many types of heat-insulating films for cars with different origins such as: USA, Korea, Germany, Japan, Taiwan, China,...

Among them, heat-insulating film brands originating from the US are given top priority because this is the birthplace of heat-insulating film. The price of films originating from the US is often high, ranging from 8-15 million VND.

Heat-insulating film products manufactured in the US often have very strict inspection processes, at least ensuring the criteria of non-toxicity, the product is fully certified for skin protection and durability according to the warranty period announced by the film company. Customers can check directly on the film company's website about the authorized representative in Vietnam.

American window film brands are trusted by many car owners.

Film brands originating from Japan, Korea, and Taiwan are currently very popular in Vietnam, sold at an average price of 5-7 million VND and advertised as being of very high quality. In fact, these countries rarely have hot seasons of 39-40 degrees Celsius, so the output standards will be much lower than films produced in the US.

Film brands originating from China are usually cheap, only from 2-4 million VND, advertised by a strange insulation film company as American films, but users will not be able to find information about that film company in the US or if they do, it will only be on a website that has not been registered for copyright protection.

These products initially had high measurement indexes through specialized equipment because the Chinese unit received orders to produce according to the parameters requested by the purchasing partner. The only thing is that the cheap film material has poor durability, the parameters quickly become distorted after a period of use and contain toxic substances.

According to insulation capacity

A normal heat-insulating film will have 5 main indicators as follows:

-VLT: Light transmission ratio

-VLR: Reflection ratio

-IRR: Infrared blocking rate

-UVR: UV blocking rate

-TSER: Total solar energy intercepted

Many people when looking for heat-insulating film are mainly marketed by sellers with UVR and IRR indexes, but these are only reference figures to prove that a line of heat-insulating film can effectively block harmful rays. Meanwhile, users should focus on the remaining 3 indexes including VLT, VLR and TSER.

The lower the light transmission ratio, the better the insulation ability.

The light reflectance ratio (VLR) is something users should be concerned about because for cars with low-quality heat-insulating film, drivers are easily dazzled when driving in the sun, causing unsafety. A high-quality heat-insulating film usually has a glare reduction rate of 20% or higher.

The second is the light transmittance (VLT) ratio. A good heat insulation film product needs to classify the types of rays that need to be eliminated (UV, IR) and the rays that should be retained (light rays). Usually, the lower the index, the darker the film.

For rear passenger side and rear glass, the light transmittance can be as low as 5% to enhance thermal insulation (solar rejection).

But for windshields (driver's glass), side glass for the front driver, the light transmission rate should be higher, from 60-70% to ensure visibility at night.

Finally, few people pay attention to the total solar energy rejected (TSER) index, also known as the heat insulation capacity. While this is the most important parameter of heat insulation film. A good heat insulation film needs this index to reach 40-60%, the higher the total solar energy rejected index, the better the heat insulation capacity of the film.

How to choose a high-end heat-insulating film?

High-quality heat-insulating films always ensure all criteria: High total solar energy rejection index but still have high optical clarity, good glare reduction, high durability, do not contain metal (because metal films will cause wave interference, corrode over time, cause glare, cause high reflection).

To achieve the above criteria, less famous heat-insulating film brands can hardly achieve due to their low prices. Therefore, you should not choose films with unclear origins, dyed films or films containing metals because of low prices.

Normally, if you choose cheap, poor quality heat-insulating film products, the following situations will occur:

- Insulation rapidly decreases after only a few years of use

- Fades and stains quickly

- Looking from the inside out will often cause glare, eye strain, and unsafe movement.

- Wave interference phenomenon, causing hindrance in the use of technological devices in the vehicle.

Choosing a reputable heat insulation film center also determines 85% of the film quality for your car.

Instead, you should choose big brands like V-Kool, 3M, Llummar, Photosync, FSK... because these are all heat-insulating film brands that have been proven by users worldwide. The warranty period is from 7-10 years, some brands like PhotoSync also have a lifetime warranty on the product.

In addition, choosing a reputable, quality and dedicated heat insulation film installation address is also one of the important factors because it determines 85% of the film quality for your car. Therefore, you need to be wise in choosing an address to install film for your car.

Nowadays, before choosing a type of car insulation film, users can easily learn through many information channels such as groups, websites and opinions of previous users. From there, during the process of learning and consulting, you will feel whether that unit is professional or not.

However, you should still go directly to the installation point of that unit. You can ask them to directly test the quality through film measuring machines to have the most practical experience of the product. This can help you better understand their scale, experience, and level of professionalism for the product line.