A bit of a disappointment in the past, today’s screen protectors are easier to install, cheaper, and better than ever in every aspect. There are three varieties — PET film, TPU (polyurethane), and our undisputed favorite — tempered glass. And then there are two methods to get them on your display — dry and wet. So here’s more about how screen protectors work and what they offer.
PET Film screen protectors
Obviously, PET doesn’t stand for a dog or a cat. It means “polyethylene terephthalate” — a type of plastic that’s available in many variations depending on specific applications. In the manufacturing industry, it’s used for mundane stuff like liquid and food containers. But this doesn’t mean that PET film protectors are glorified water bottle plastic. They consist of polyester film with a scratch resistant matte coating on one side and a silicone adhesive on the other.
TPU screen protectors
TPU (thermoplastic polyreuthane) is next in the screen protector food chain. This is chemically-enhanced plastic whose properties include scratch resistance, elasticity, oil and grease resistance, and increased toughness. Since the material is elastic, it has limited “self-healing” abilities. This means that its slight softness gives it the power to absorb non-extreme impact, such as most drops and lighter scratches, while retaining all or most of its original composition. For example, lighter scratches usually leave just a small dent in the soft plastic, which slowly returns to normal.
The “military-grade” tag most TPU protectors proudly carry is worthy of an explanation. One manufacturer says that this material is used “to protect jetfighters”. And what do you know, it’s true! Skim through this Aerospace Surface Protection brochure — it’s full of polyurethane protective tapes used for “aircraft and windmill leading edge protection”. However, getting a TPU case or screen protector doesn’t guarantee it’s made of the same quality of material. But your smartphone also isn’t a fighter jet, right?
If you are willing to pay a slightly higher price, a TPU protector is, logically, better choice than PET film. At the very least, it’s going to provide better impact protection (although you shouldn’t be pushing your chances). It’s also nicer to the touch, although it isn’t glass-smooth. Arguably, the best part is that you’ll get to explain to your friends and acquaintances how your phone has “fighter jet protection”. Pretty cool, huh?
Tempered glass screen protectors
Protection with a temper! Tempered glass (TG) screen protectors are the absolute best you can buy. Material-wise, a high-quality TG protector is multi-layered, usually starting with shock absorbent silicon on the bottom layer, followed by PET film, and an optically clear adhesive to ‘sandwich’ the previous two layers with the next two, which are tempered glass and oleophobic coating.
A glass protector is superior to its alternatives in every way. It has better light transmittance, making for a clearer display. It’s anti-reflective and glare reducing. It has oleophobic coating, which heavily reduces fingerprints. It has the smooth feel of actual glass under your fingertips. It can even resists sand scratches, making it the only viable option for beach-goers.
And let’s talk about shock protection. T-glass protectors boast a material hardness rating of 8H to 9H, meaning they are hard enough to resist scratches from anything that’s not topaz or corundum (extremely hard aluminum oxide). Yet, they aren’t completely shatter-proof.
As you probably expected, tempered glass protectors are the most expensive kind. Still, thanks to their popularity and fierce competition among manufacturers, the prices have come down drastically.
Dry vs wet screen protector installation
There are two methods for installing a screen protector – dry and wet. The method is usually specified on the box. Installing a screen protector can be a tedious and finicky job and many people are hesitant to do it, some even opting to pay a “specialist” to install one for them. In reality, protector manufacturers know that and every reputable brand goes to great lengths to provide all the necessary tools and instructions so anyone can do it.
The dry method keeps the protector glued to the screen with static electricity. There’s no adhesive involved, and the application is very straightforward. The exact steps will be explained on the packaging, but here’s a rundown with a few tips.
- Enter a dust-free environment. At home, your bathroom after a shower is a good place to do it since the steam will make sure no dust particles are floating around.
- Clean your phone thoroughly. Most protectors now come with special wipes and even stickers to pick off any leftover dust particles. Use a bright light to check the display under different angles one last time.
- Carefully align the screen protector to the display. Some protectors come with special tools or stickers that help with the alignment so you can’t get it wrong. Peel any plastic that’s covering the protector and place the protector on the display (make sure the correct side is up). If it’s not aligned perfectly, you can gently remove it and try again.
- Use a soft cloth wrapped around the edge of a credit card(or something else plastic) to remove any air bubbles and make sure the protector is firmly adhered to the display. Always start from the middle of the display and move towards the edges.
- Peel any plastic on top of the protector and you’re done!
Wet installation might sound scary but in practice it’s not much more difficult than the dry one. The process is very similar to the one described above.
However, before putting the protector to the display, you first need to apply some liquid adhesive to it. There are different ways to do that depending on what brand you’ve chosen.
Some provide tiny spray bottles with the solution inside. You spray the display or the protector (or both, it varies) and then have to adjust the protector by slightly moving it around until you’re happy with the fit. After that, you use the provided squeegee to remove any bubbles and excess liquid between the display and the protector. A final wipe on the top should leave you with a nice, clean look.
Other brands provide a better method for application but it will cost a bit extra. With the protector comes a special contraption that holds your phone. It not only helps spread the liquid evenly, but also makes sure the protector is aligned and applied perfectly with almost no effort on your part.
And then there are companies that sell wet-mount protectors using adhesives that require UV-light curing. Of course, they come with the UV light in the box, but the price for one can be quite high (still cheaper than a new display, though).
Screen protectors and in-display fingerprint readers
Fingerprint sensors tucked under the display are now commonplace but with the futuristic technology that powers them came a problem. Screen protectors add a variable to the fingerprint-scanning process which the phones sometimes can’t account for. This can result in either a worse chance of getting a correct read or a complete lack of compatibility between some sensors and protectors.
Can a screen protector hide screen scratches?
A common question coming from people that obviously aren’t using screen protectors is if applying one can hide existing display scratches. And the answer is: it depends. Shocking, right?
First, it depends on the severity of the scratches. Obviously, the deeper the scratch the smaller the chance it will disappear under the protector. But mostly, it depends on what protector you’re applying. If hiding scratches is your goal, your best bet is a protector with liquid adhesive. The liquid will fill the minuscule void left by the scratch and once the protector is on, it could disappear completely.
For very tiny scratches, even a regular dry-mount protector could be good enough to mask them.
With so many options available, and at very fair prices, getting a screen protector for your device has become a no-brainer. PET film products are the best choice for basic screen protection. TPU protectors can be a bit rare, but they have the best ratio of affordability and toughness.