Tempered Glass Screen Protectors

tempered glass screen protectors

What Is Meant By Tempered Glass?

Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such stresses cause the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards as plate glass (a.k.a. annealed glass) does. The granular chunks are less likely to cause injury. As a result of its safety and strength, tempered glass is used in a variety of demanding applications, including passenger vehicle windows, shower doors, architectural glass doors and tables, refrigerator trays, mobile screen protectors, iPad covers for iPad maintenance as a component of bulletproof glass, for diving masks, and various types of plates and cookware.

How Is Tempered Glass Made?

Tempered glass is about four times stronger than ordinary, or annealed, glass. And unlike annealed glass, which can shatter into jagged shards when broken, tempered glass fractures into small, relatively harmless pieces. As a result, tempered glass is used in those environments where human safety is an issue. Applications include side and rear windows in vehicles, entrance doors, shower and tub enclosures, racquetball courts, patio furniture, microwave ovens and skylights.

To prepare glass for the tempering process, it must first be cut to the desired size. (Strength reductions or product failure can occur if any fabrication operations, such as etching or edging, take place after heat treatment.) The glass is then examined for imperfections that could cause breakage at any step during tempering. An abrasive such as sandpaper takes sharp edges off the glass, which is subsequently washed.

Next, the glass begins a heat treatment process in which it travels through a tempering oven, either in a batch or continuous feed. The oven heats the glass to a temperature of more than 600 degrees Celsius. (The industry standard is 620 degrees Celsius.) The glass then undergoes a high-pressure cooling procedure called quenching. During this process, which lasts just seconds, high-pressure air blasts the surface of the glass from an array of nozzles in varying positions. Quenching cools the outer surfaces of the glass much more quickly than the center. As the center of the glass cools, it tries to pull back from the outer surfaces. As a result, the center remains in tension, and the outer surfaces go into compression, which gives tempered glass its strength.

smart phone glass screen cover

Can Tempered Glass Be Removed From A Phone

If your tempered glass phone or tablet screen protector shatters, don’t panic!

If you need to remove a tempered glass screen protector from your smartphone, turn off your phone first and then try some of these suggestions:

Turn off the phone or tablet.

Use a toothpick to create a gap between the tempered glass protector and the screen. The goal is to lift the screen protector up from each corner.

When you can, fit a credit card into the gap, keeping the strain on the protector while you slowly pull up to remove it. If this does not work, attach a small piece of duct tape to the protector and slowly peel the protector up off the screen.

Once the protector is off, use a microfiber cloth to wipe the screen clean.

If you’re having a hard time getting the protector off easily, you can soften the screen with a hair dryer. Just be careful not to overheat your phone.

Does Tempered Glass Break Easily

Picture a nice beer glass in your hand. Now imagine dropping it on a tile floor. It breaks unevenly, some large pieces and some small. You sweep it up, but inevitably those jagged, teeny-tiny shards get left behind and sometimes end up in your foot. That’s shattered glass.

Now to understand how tempered glass breaks, think of a rock hitting your car’s windshield. It might create a little divot, or maybe a bigger rock makes a spider crack. Either way, your windshield doesn’t shatter and explode like the beer glass does. That wasn’t always the case: Back in Henry Ford’s days, a pebble could pulverize an entire windshield.

Part of the reason modern windshields don’t shatter is because they have a laminate layer between tempered glass sheets, binding it all together. While the laminate prevents pieces of windshield from bursting apart, the tempered glass avoids the hazard of sharp, dissimilar shards.

So if a weizen and a windshield are both glass, why do they behave differently? It’s because they’re treated differently – chemically speaking.

What Is The Difference between Tempered Glass And Regular Glass?

Standard Glass

Broken Standard Glass

As you can see, standard glass breaks

apart into large dangerous pieces.

Standard glass uses an annealing process that forces the glass to cool very rapidly, allowing a company to manufacture more glass in a small amount of time. Standard glass is also popular because it can be reworked. Cutting, reshaping, polishing edges and drilled holes are some customizations that can be done without breaking or shattering regular glass. The downside to the faster annealing process is that the glass is much more fragile. Standard glass breaks apart into larger, hazardous and sharper pieces. This can be dangerous for a structure with windows closer to the floor where someone could fall through the window or even a front windshield for a vehicle.

Tempered glass,

on the other hand, is known for its safety. Today, automobiles, buildings, food service furnishings, and cell phone screens all used tempered glass. Also known as safety glass, the tempered glass breaks down into smaller pieces that have less sharp edges. This is possible because during the annealing process the glass is cooled down slowly, which makes the glass much stronger, & impact/scratch resistant compared to non-treated glass. When broken, tempered glass not only breaks down in smaller pieces but also breaks evenly throughout the entire sheeting to further prevent injury. One important downside to using tempered glass is that it cannot be reworked at all. Reworking the glass will create breaks and cracks. Remember safety glass really is tougher, but still requires care when handling.

tempered glass for iphone

Tempered Glass And Its Uses

Most of you must have heard of a tempered glass used to protect your mobile’s screens. But it’s time to find out what exactly makes a glass tempered? This glass is created in a unique way.

First, the kind of glass is heated intensely and is then cooled down quickly. This process makes this glass super useful and gives it a unique structure.

 The glass sheets undergo a tempering process. This is where it passes through an oven or a heating machine for tempering. This process can be done in batches or even in one continuous motion. 

Further, the glass then goes through a process called quenching. Here glass is cooled down. This process lasts for barely any seconds. So, various nozzles are used to blast high air pressure on the glass surface. As the middle of the glass cools down first, so this side of the glass contracts;, whereas the outer surface compresses. This change allows the glass to become strong. This method is time taking but super effective.

Thus, there are multiple ways to use tempered glass.

One of its most frequent uses is as a screen protector in various gadgets. 

Other than that, windows in a vehicle are also made up of tempered glass. 

Moreover, shower doors, architectural glass doors and tables, and even refrigerator trays are made up of this glass. 

It can be used in microwaves because of its ability to retain itself and its strength. Most microwave dishes are made of tempered glass. Similarly, basking ovens also have this type of glass very often. No one wants their microwave or oven dishes breaking every now and then, right? So, the right material is essential for such purposes. 

This glass has a lot of commercial uses too. Phone booths, escalators, stairways, and even solar panels can be made using a glass that is tempered. 

Is Tempered Glass Expensive?

Screen protectors are cheap. In fact, they’re often entirely free, given away with other products such as phone cases. For larger items like tablets and laptops you’ll have to hand over cash, but that’s when you discover there are hundreds of different makes and price points. Some prices can be eye watering.

What’s On Offer?

Part of the higher asking price for these screen protectors goes into marketing and packaging, with most keen to sell their advantages over the plastic film that can be had on eBay for next to nothing. The most common claim is scratch and damage protection, and the price premium sees this taken to extreme levels. Tech Armor’s HD Ballistic Glass protector range, for example, will set you back on account that it will absorb almost any impact.

We were unable to test the product name’s implied protection from ammunition, as the Micro Mart service revolver was holstered firmly to the editor’s hip on the day we wrote this feature. However, it clearly suggests that dropping even a heavy weight with a pointy edge directly onto your phone or tablet’s screen should equate to no damage – or damage resulting only in a cracked screen protector. Indeed, some of these screen protectors are advertised with a picture of an electric drill attacking the screen.

How To Tell If Glass Is Tempered

Identifying tempered glass is easy if you don’t mind breaking it. Unlike annealed plate glass, which shatters into large, dangerous shards, tempered glass fractures into bite-sized pieces with much less ability to inflict personal injury. You probably prefer to keep your glass intact; even so, you can recognize tempered glass by its distinguishing features.

Plate glass is usually annealed by heating it and cooling it slowly to make it less breakable. Manufacturers make tempered glass by reheating annealed glass to a temperature of about 1,200 degrees Fahrenheit, then quickly quenching the heat with air currents to bring the glass to a temperature of around 400 to 600 degrees Fahrenheit. Because tempered glass has characteristics that are so different from annealed glass, manufacturers are required to identify it with a stamp in at least one of the corners. The stamp, which may say Tempered or simply Temp, is either sandblasted into the glass or applied as a porcelain overlay.

How To Replace A Tempered Glass Screen Protector

If you have a crack in your tempered glass screen protector, then it’s done its job. It’s taken the lumps so that your iPhone or iPad’s screen didn’t have to. Once a tempered glass screen protector has a crack in it, it’s exponentially less effective – you should replace it. Here’s how to replace yours so that your iPhone or iPad’s screen remains soundly protected.

Removing your old tempered glass screen protector

There are a few ways to remove your busted tempered glass screen protector, and the one you use will depend on just how well-attached the protector is to your screen.

Before you start, use a hair dryer on low on your screen for about 15 seconds. This should slightly heat up and loosen the adhesive on the screen protector. Do not overdo this part.

  • Method 1

Before getting out your toolkit and working on your iPhone or iPad like it’s one of Frankenstein’s creations, try removing the screen protector with your fingernail.

Start by trying to lift the screen protector up from each corner. One of them’s gotta give!

Once it starts coming up, stop pulling from just the corner and move further along the protector as it starts to peel off. This will help prevent it from falling to pieces before you can get it all the way off.

Pull slowly and evenly; otherwise, you’ll have a jigsaw puzzle of tempered glass pieces to clean up.

  • Method 2

Try using a toothpick to pry up one of the corners. Make sure you point the sharp end up toward the screen protector as you do this and not down toward the screen.

Once you can get a corner up, pull with your fingers, once again pulling slowly and evenly.

If you can, slide a credit card into the gap and slowly push it along to lift the screen protector.

  • Method 3

Try some duct tape!

Roll a piece of duct tape around two of your fingers with the sticky side out.

Start in a corner and press the duct tape onto it, rolling away from a corner slowly. Hopefully, the duct tape will adhere to the screen protector, and you’ll be able to pull it up and off.

How To Remove A Tempered Glass Screen Protector?

Removal of the Sahara Case ZeroDamage screen protector is effortless. Use a fingernail or thin piece of plastic to lift a corner of the protector gently. Once separation occurs, slowly continue to lift the protector from the screen. Do not force it, or you risk breaking the protector, causing more work. Ideally, the protector should come off in one piece. Place the old screen protector in a safe place until you have placed the new protector on your device. Place the old protector in the container the new tempered glass screen protector arrived in for safe disposal.

When To Replace A Glass Screen Protector

Tempered glass screen protectors are the preferred method for keeping your phone’s screen scratch- and crack-free.

There are several factors, however, that play into how long that screen protector itself will last. With care, a quality tempered glass screen protector will last indefinitely. Chances are, barring any screen-shielding cracks, your screen protector will outlast the other components in your phone, like the battery.

But hold on—there are a few situations where replacing that tempered glass screen protector with a brand-new one is a good idea. Read on to find out if you should replace your screen protector.

3 Times When You Should Replace A Screen Protector

  •  It’s Cracked Like An Egg

It should be no surprise that the top reason screen protectors get replaced is because of a crack (of either the single edge-to-edge fissure or the severe spiderweb impact).

You might think that a broken screen protector is indicative of low quality. But consider this: the screen protector absorbed the impact shock that otherwise would have gone straight for the phone screen.

Your screen protector sacrificed itself for your phone. After an appropriate mourning period (say, ten seconds), carefully remove the broken protector and replace it as soon as possible.

Continuing to use a broken glass screen protector can be dangerous, as the sharp cracks can deal out harsh cuts to your fingers. We recommend gloves and thin tools (like the squeegee provided in our Protection Kits) to prevent injury when removing the protector.

  • 2. It’s Scratched Into Oblivion

Just as a screen protector is designed to absorb crack-inducing impact damage, it also doubles as a shield against more minor everyday scratches. Don’t be fooled, though—those tiny scrapes can add up to a screen that’s downright difficult to see.

Scratches absorb light and refract it, rather than letting it pass through as a smooth surface would. Because scratches on a protector receive light from both sides (the illuminated phone screen as well as the outside world), a screen protector can quickly fill up with scratches to the level that the screen itself becomes difficult to comfortably see.

High-quality protectors, like SaharaCase’s ZeroDamage Glass, have a 9H hardness rating that helps mitigate scratches from common culprits like keys and sand grains. However, if your screen is getting difficult to see because of scratches, it’s best to replace the screen protector. Once again, the protector has done its job.

  • 3. It’s Peeling Like A Sunburn

The third reason you should replace a screen protector is if its adhesive backing is failing, resulting in a sheet of glass peeling up at the corners.

This is no fun because since the protector is no longer making contact with the touch screen, your taps, swipes, and pinches won’t always be recognized. A good screen protector won’t usually start to peel unless maybe it’s been submerged in water (in which case, you’ve got other problems) or wasn’t installed well in the first place.

Even tiny particles like a bit of dust can interfere with a solid adhesive seal, eventually leading to peeling and bubbles under the screen protector. Luckily, our Protection Kits come with everything you need for a pristine, easy installation

ipad tempered glass screen protectors
ipad glass screen protectors

How Do You Clean Tempered Glass?

A tempered glass screen protector shields your phone’s screen from wear and tear. On occasion, however, debris may get in between your phone’s screen and the protector. Fortunately, tempered glass screen protectors are easy to clean.

Trapped debris can form a bubble in your screen protector, making it look like your screen is marred. You might be tempted to clean the adhesive side of the screen protector only to spread the dirt and dust around. To avoid this, it’s important to properly clean both sides of your screen protector. Here’s how:

To clean the front of your tempered glass screen protector:

Use a mixture that consists of an equal part dish soap and water. You should avoid abrasive cleaners or acid, vinegar, or chemical-based cleaners. Carefully apply the mixture to the screen, allowing 15 seconds for the cleaner to work its way into the grime. After that, use a soft sponge to remove the mixture. Then buff the screen with a soft cloth.

To clean the sticky side of your tempered glass screen protector:

 Start on a clean surface and have a roll of packing tape and a soft cloth handy. Wash your hands thoroughly to rid them of natural oils that could smudge your screen protector. Carefully remove your tempered glass protector from your phone.

Cut off a few pieces of tape and loop them into rolls with the adhesive side out. Stick the rolls to the top side of your screen protector. Invert the screen protector and stick it to the table so that it is anchored firmly in place.

After that, place strips of tape across the sticky side of your tempered glass. Peel them off slowly, removing the dust and dirt in the process. Continue doing this until you have removed all of the tape strips. Wipe the surface with a microfiber cloth and put the screen protector back on the phone’s face.

How To Clean Tempered Glass

While your tempered glass furniture or decorations may look great and add a great deal of personality to wherever you have chosen to place them, they will not look as attractive if they are dirty. Unfortunately, if you have tempered glass for long enough, this is inevitable. Before you clean your tempered glass, you should learn the proper cleaning techniques for this unique material. If you do not, you may accidentally damage it—defeating the purpose of cleaning it in the first place. What follows should give you all that you need to know to clean it safely and effectively.

Prepare the Materials

To begin, you will need to make a cleaning mixture to use, and the best ingredients are ordinary dish soap and water. Mix the soap and water in equal amounts, then pour the mixture into a spray bottle and seal it shut. Mix them together by shaking the spray bottle.

Washing the Glass

Tempered glass is actually very easy to clean, but it is also very easy to damage. Any small particles dragged over tempered glass repeatedly will scratch it, as will any rough surface rubbed against it. Because of this, you need to be very careful as to how you wash your glass and avoid taking any shortcuts. While shortcuts may save you time now, they may ruin your glass for good.

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