How to Choose a Tempered Glass Screen Protector for My Phone?

how to choose glass for your phone

by Alex Gustman

Updated: July 21, 2021

The tempered glass screen protector is the most popular accessory for smartphones. Since the protective surface eliminates the formation of scratches on the front panel, as well as reduces the likelihood of damage in the event of an impact. At the same time, in addition to the protective properties, it is important to take into account other parameters to avoid deterioration of the sensor performance and information display. The article contains important recommendations that will help you choose the most optimal glass for your smartphone.

Type of Protective Surface

Protective glass should be understood as tempered glass obtained as a result of thermal or chemical hardening. After processing, the protective surface better tolerates shocks and the absorption of mechanical energy. Such an accessory is preferable in terms of protection in comparison with other types of screen protectors. Read more about the properties and varieties in the article What is Tempered Glass Screen Protector.

tempered glass

There is also a liquid glass in the form of a gel that is applied to the surface and smeared with a thin layer. After solidification, the resulting layer, in theory, provides reliable protection, in practice, the protective properties are worse than a conventional film. Therefore, it is not recommended to use liquid glass.

There are also conventional and hydrogel films on sale. In comparison with a conventional film, the hydrogel film tightens small scratches, which makes it last longer, and also smoothes air bubbles, in case of incorrect installation. At the same time, the protective properties of the film are inferior to glass, which is described in detail in the comparative article What is Better Protective Glass or Film.

protective film

Read also Best Brands for Tempered Glass Screen Protector


On sale there are tempered glasses with a thickness of 0.26, 0.33 and 0.5 mm. In theory, as the thickness increases, the protective properties also grow. In practice, mechanical energy is absorbed in the same way. Except that the wear resistance of the glass is 0.5 mm higher in comparison with the options of a smaller thickness. Also, the thickness of the glass does not affect the sensitivity of the sensor.

tempered glass thickness

It is worth noting that glass often negatively affects the ultrasonic fingerprint scanner. The increase in thickness interferes with the reading of the fingerprint, which is solved only by buying a glass device certified by the manufacturer or an option with a cutout for the reading place. In the first case, the glass will cost more, in the second it is cheaper, but worse in aesthetic terms.

Surface Type

Tempered glasses with glossy, matte and combined surfaces are available.

Glossy glass does not affect the brightness and color reproduction of the screen. At the same time, scratches on such a protective surface are visibly better. The surface also reflects a concentrated stream of light better, which causes glare.

Frosted glass is less common, since the brightness is partially reduced after installation. The image becomes somewhat grainy, which increases eye fatigue. At the same time, scratches and glare on the glass are less noticeable.

There are also combined-type glasses that combine the advantages of a glossy and matte surface.

It is preferable to choose a glossy or combined type of glass.

Read also What is UV Tempered Glass?


This parameter affects the light transmission of the screen through the glass. The greater the transparency, the less light will be retained by the tempered glass screen protector. Most glasses have a transparency level of 92-95%. There are also glasses with transparency of up to 98-99%.

tempered glass transparency

It is preferable to choose glass with maximum transparency. Otherwise, you will have to increase the base brightness level, which will accelerate the battery discharge.

transparency of protective film


Each tempered glass is made for a specific smartphone model, which takes into account the dimensions of the screen, the aspect ratio and the cutouts for the elements built on the front side.

In tempered glass screen protectors, the edges at the ends are beveled, as indicated by the 2.5 D prefix in the name. The presence of rounding eliminates the possibility of a finger cut during operation, visually the glass is not so noticeable, and even less likely to catch and undermine the glass on a sharp edge.

Also, there are 3D glasses on sale with bends that repeat the shape of a smartphone. Basically, such glasses are designed for devices with a waterfall screen, where the faces completely or partially go to the side.

It is important to buy the glass corresponding to the smartphone model used. If there are no suitable glasses for such a model, it is worth considering similar models, being aware that there may be discrepancies during installation.

Coating and Spraying

Most glasses contain a light or active oleophobic coating. Thanks to the coating, fewer stains are formed on the surface during use, and moisture concentrates and flows down in the form of drops. At the same time, such a coating is not durable and is erased after 1-2 weeks. For the restoration of oleophobic spraying, appropriate gels are available on sale.

There are also glasses with a UV coating that reduces the effect of color on the eyes in a certain spectrum.


The article describes in detail how to choose a tempered glass screen protector for a smartphone. The collected recommendations will help you choose the optimal tempered glass in combination with useful properties that will not worsen the performance of the sensor, brightness and color reproduction.

What questions do you have? Ask in the comments below this article.

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Alex Gustman

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