1. In terms of heat insulation performance, metal films significantly outperform ceramic films. Metal films are made from various precious metals using advanced processes like magnetron sputtering, allowing for selective passage of light. Conversely, ceramic films, composed of ceramic materials, may produce secondary heat radiation when the ceramic layer reaches thermal saturation. Consequently, metal films provide superior heat insulation compared to ceramic films.

2. From the perspective of light transmission, metal films tend to have darker colors, resulting in reduced transparency but offering better privacy. Ceramic films, on the other hand, feature lighter colors, allowing for more light transmission but providing somewhat weaker privacy. For car owners who frequently drive at night, opting for ceramic films can be a practical choice, as it aids in better visibility during nighttime road conditions.

VLT=light transmittance, UVR=ultraviolet rejection rate, IRR=infrared rejection rate. To put it simply, the primary focus should be on maximizing the values of the two dash lines, which are UVR and IRR, while Visible Light Transmittance can be adjusted according to individual preferences.

When selecting a front windshield film for your car, it's important to consider the following factors:

A. Avoid Excessive Heat-Reflective Films:

Highly heat-reflective front windshield films are typically made from multiple layers of metallic materials that use metal components to reflect solar heat. The higher the heat-reflectivity, the more metal content is usually present. While this enhances heat insulation, it often comes with various negative issues. For instance, it can interfere with mobile phone signals or disrupt the normal use of GPS systems. Additionally, films with high metal content tend to be thicker, making installation more challenging.

B. Darker Tint Doesn't Mean Better Heat Insulation:

Front windshield films must allow over 70% light transmission to ensure safe driving. If the film tint is too dark or too deep, it can lead to prolonged visual fatigue for the driver and increase the risk of traffic accidents, especially during nighttime driving.

C. Avoid Excessive Reflectivity:

If the front windshield film has high reflectivity, it can cause mirror-like reflections on the windshield when there is light inside the vehicle (such as reading lights or dashboard illumination) during nighttime driving. This directly affects the driver's ability to see the road and can lead to traffic accidents.

D. Ensure High Clarity:

Front windshield films vary in material quality, and lower-quality materials may exhibit varying degrees of wave-like patterns or an orange peel texture. This can create a sensation of waviness in the scenery while driving. Prolonged exposure to such conditions can lead to visual blurring, dizziness, reduced vision, nausea, and discomfort. Therefore, high clarity is a primary criterion when selecting a front windshield film.

1. In order to ensure that the car film and the glass are completely adhered after the film is applied, the car film cannot be cleaned and the defogging line switch cannot be turned on within a week. Try not to let the sun directly expose the glass, which will cause blistering. You should turn on the air conditioner in the car to allow air to circulate inside and outside. The breathability of the car film itself will form a natural solidification to ensure that the glue and the glass are completely combined after the car film is installed. , in order to form a safe and explosion-proof effect.
2. After applying the film, a little moisture will inevitably remain between the car film and the glass, which may cause small bubbles or slight ripples, resulting in blurred vision. This is normal. After being exposed to the sun, it will disappear naturally after 4 to 10 weeks. If the obvious phenomenon still exists after a period of time, be careful not to handle it without authorization. You should find a professional technician to handle it.
3. When cleaning the glass, it is forbidden to use solvents with high acidity and alkalinity for cleaning, and try not to let oily liquids such as leather oil get on the car film. You can use clean water or non-acidity and alkalinity cleaning fluids on the market. Most glass cleaners work well for cleaning car film. A more suitable cleaning solution for car films is a 10:1 dilution of water and household detergent.
4. The surface hardening of the car film is limited. To avoid scratching the car film, do not use any cleaning supplies with hard particles such as brushes and sandpaper. It is correct to use a soft cloth or sponge to clean the surface of the car film. Clean the cloth outside the car body, and do not use it to wipe the car film, because the cloth used outside the car body is easy to contain fine sand, which is also one of the factors that cause scratches on the car film.

Wrinkles on the film surface can occur during the drying and curing of the film. There are generally three types of wrinkles: wrinkles that occur during the initial film application, bead wrinkles that occur during repeated film application, and wrinkles caused by the action of acidic gases inside the oven.

After a film is applied to flat glass, the overall light transmittance of the film plus glass will be lower than that of the original pure glass. All quality inspection standards should be based on the absence of defects in the glass itself.
Since solvents are used during installation, it will take a certain amount of time for the film to be fully attached after it is applied. Although some water cannot be seen, it still remains between the film and the glass. The complete adhesion of the film is also commonly referred to as the "film drying time". As the film dries, the viscosity of the glue will gradually increase. The speed of the film drying has a certain relationship with the thickness of the film and the metal content. Weather factors also have an impact on how quickly the film dries.
Before the film is completely dry, inspection of optical quality can be performed. It should be noted that some phenomena before the film is completely dry, such as blisters, image deformation of objects due to water, and water mist, are all normal phenomena.
The naked eye inspection of filmed glass should be from indoors to outdoors and from the correct angle, and the distance should be within 2 meters. The inspection should be conducted under normal natural light during the day and should not be directly exposed to the sun. The inspection area should be within 5 cm from the glass frame.
The installation will be considered qualified if there are no following conditions (except for normal phenomena that occur during the film drying process): debris, hair and fibers, glue agglomeration, fingerprints, bubbles, scratches and cracks in the film, and film body deformation , oil stains in the film, warped edges of the film, and knife marks. The above detection should be done within 24 hours after installation.

A number of protective measures need to be taken during the construction of automobile window film to ensure the safety of the construction process and protect the appearance and internal equipment of the car. Here are some key protective measures:
1. Install protective pads on the front and rear hoods and other surfaces to prevent the car's paint surface from being scratched during the construction process.
2. Use a disposable plastic protective cover on the inside of the door to prevent the installation fluid sprayed when applying the window film from staining the door, floor and seats.
3. Protect the air outlet of the air conditioner during construction to prevent installation fluid from flowing into the outlet, thereby avoiding short circuit failure of electrical appliances and speakers in the car due to moisture.

Additionally, there are some requirements related to the window film itself:
1. There should not be too many defects in the window film, and there should be no creases, bubbles or scratches on the film surface.
2. For the top of the roll-down window, a small gap of 1-2mm should be reserved to facilitate rough observation and not be easily noticed.
3. The window film should cover the black glaze area of the glass frame to ensure that no light leaks out. At the same time, there should be no edge warping to maintain a beautiful and coordinated appearance.

According to the classification method of glass films by the International Glass Film Association (IWFA), automobile glass films can be divided into three basic types:
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1. Dyeing film (non-reflective, refers to the reflection of infrared rays). This type of film does not contain a metal layer and has no function of reflecting infrared rays. It has glare control and certain heat insulation functions. It mainly plays the role of heat insulation by absorbing solar energy and then releasing it outwards. The thermal insulation efficiency is much lower than that of reflective film.
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2. The composite film of dyeing film and vacuum metallization film (reflection) is called high-performance film in the industry. This high-performance film is usually composed of a layer of bulk dyeing film and a layer of vacuum aluminized film. Compared with non-reflective dyed films, it has a higher visible light transmittance and a higher heat insulation rate. However, the dyed layer will scatter light, causing visual distortion, so the clarity is lower. Difference.
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3. Magnetron sputtering metal film (reflection), also known as pure metal film. This is a film with the highest level of glass film manufacturing technology. This film uses a magnetron sputtering process to coat the film substrate with a layer of different metal ion coatings with extremely high infrared reflectivity. The metals used are usually copper, stainless steel, nickel-chromium alloy, etc. The color of the film is entirely determined by the metal plated.

The redevelopment of car window film functions gave rise to the first generation of coating and composite technology in the 1960s, commonly known as tea paper film. The main function of this kind of film is to block light and basically does not insulate. Just like sunglasses, it can only change the visual light perception. Moreover, the clarity of the tea paper film is very low, and the formaldehyde odor is very serious. It is only suitable for passenger cars, excavators, etc., that are used to install goods.

The second generation is a dyed film using a dyeing process. This kind of membrane was produced in the 1970s. Most of the membranes currently on the market are deep dyeing processes. The deep dyeing method is used to add heat absorbers to absorb the infrared rays in the sun to achieve a heat insulation effect. Because it also absorbs visible light, the visible light transmittance is insufficient. Coupled with the limitations of the dyeing process itself, the clarity is relatively poor. Another major disadvantage of dyed film is that its thermal insulation function decays quickly, and it is easy to fade. Many dyed films will not only fade after a year and a half, but will no longer be insulated and may even blister, seriously affecting the visual appearance. This type of film is particularly suitable for instant heat insulation tests. 4S stores often use the characteristic of dyed films to absorb heat instantaneously to fool customers, so inferior dyed films sent by 4S stores must not be given.

There are several key technical aspects and knowledge related to safety glass film and explosion-proof film:

1. Weather Resistance Treatment: PET-based films can soften and deform at high temperatures (around +50°C) and may freeze and crack at low temperatures (around -10°C). However, with advanced weather resistance treatment, PET-based films can maintain their physical and chemical properties in a wide temperature range, from -70°C to +150°C. This makes them suitable for use in various environmental conditions.

2. Original Color Body Film Technology: These films use PET substrates made from original color body resin, ensuring that they do not fade over time. The even distribution of these resin molecules contributes to excellent visibility through the film.

3. Magnetron Sputtering Metal Coating Technology: Magnetron sputtering is a process that takes place in a large vacuum chamber with low pressure and inert gas. It involves bombarding various metal or alloy targets with charged ions, causing metal atoms to accumulate on the surface of a PET substrate. This process creates films with unique and stable colors, high levels of light transmission selectivity, and excellent sunlight control properties.

4. Pressure-Sensitive Adhesive Electromagnetic Treatment Layer Technology: The pressure-sensitive adhesive layer undergoes electromagnetic treatment. This layer responds to pressure even before it is applied to the glass, allowing the adhesive molecules to reorganize and form a protective layer. When pressure is applied, the adhesive rebounds, significantly increasing the strength of the glass. This feature provides impact resistance and helps prevent glass from shattering upon impact.

There are four main types of window films:

Dyed Films: These films originated in the 1930s and were primarily designed to block intense sunlight. Dyed films do not provide significant heat reduction and are mainly used for glare reduction.

Dyed Hybrid Films: Introduced in the 1960s, these films use deep-dyeing techniques and incorporate heat-absorbing agents to reduce heat. While they do provide some heat rejection, they also absorb visible light, leading to lower visible light transmission and reduced clarity. These films can deteriorate over time and tend to fade, but they are relatively affordable.

Vacuum Coated Films: Emerging in the early 1990s, vacuum-coated films use advanced technology to evaporate layers of metals onto a substrate to achieve heat rejection. While these films offer better and longer-lasting heat reduction compared to dyed films, they may compromise clarity and can have higher reflectivity, which can affect visibility.

Sputtered or Metalized Films: The most advanced type of window film, sputtered or metalized films, emerged in the late 1990s and have seen continuous technological improvements. These films utilize a process called sputtering, which evenly deposits metal particles like nickel, silver, titanium, or gold onto a high-tension PET substrate using a sophisticated multi-chamber, high-speed rotating system. Sputtered films provide excellent heat rejection, low reflectivity, and long-lasting color stability. They also maintain high clarity, making them the top choice for high-quality window films.

Misunderstanding 1: Choose dark film
When people choose solar film, in order to obtain better thermal insulation effect and good privacy, they often choose dark-colored solar film. In fact, ordinary "black paper membrane" and "tea paper" are not insulated at all. The thermal insulation effect of the membrane is determined by whether the membrane contains an insulation layer. Although the professional film is light in color, it can block 700 watts of heat under the scorching sun (solar radiation is 900 watts/square meter), while the low-end dark film can only block 300 watts of heat. At present, the films produced in Southeast Asia are basically glue-dyed films. Compared with the metallized films produced in the United States, just like black and white TVs compared to color TVs, the thermal insulation performance is very different.


Misunderstanding 2: Apply two layers of film
Applying two layers of film usually causes the following two problems. First of all, the adhesive design of the film is for sticking on glass, which cannot guarantee the perfect bond between the two layers of film. Secondly, the second film may immediately stick to the first film, leaving no time to squeeze out the moisture. Usually, applying two layers of film is easy to produce bubbles and water pockets, and these will become larger and more numerous over time. In fact, if you need to apply film to make your home darker, you can choose a film with low light transmittance instead of applying two layers.


Misunderstanding 3: Look for the infrared blocking rate
95% infrared blocking rate means 95% heat insulation? This is a wrong concept. Only 53% of the sun's radiant heat comes from infrared rays, another 3% comes from ultraviolet rays, and 44% comes from visible light. So even if a film can block 100% of infrared radiant heat, there is still 47% of solar radiant heat to deal with.