How to crack a tempered glass screen protector

I’m a big believer in kitting out Smartphones With a screen protector. A good quality Tempered glass screen protector It’s cheap insurance against scratches and chips, and can keep your smartphone looking new for a long time, and can help you improve value if you want. Resell your phone Below the line.

I always choose a good quality tempered glass screen protector with a hardness rating of 9 Mohs.

Moss was introduced in 1812 by geologist Friedrich Moss to compare the hardness of minerals. Level 1 has talc, a soft mineral, while level 10 has diamond, the hardest. The unit is measured by scratching a material of different hardness.

This makes Mohs a good way to measure how scratch-resistant a material is.

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A good quality tempered glass screen protector has a hardness of 9, which means that there are fewer materials that can scratch it. Gold, silver and aluminum have a hardness of about 3, steel has a hardness of 4.5, teeth and lava glass have a hardness of 5 and hardened steel has a hardness of 8.

Sapphire is used as crystal for some high-end watches, including Apple Watch Ultra9 hardness.

But how good are these screen protectors?

We can find out.

Here I digress ESR Armorite tempered glass screen protector Against a few nastiness.

Note that I’m testing the screen protector on a smooth, yielding surface. I’m sure it would be even stronger on a flat, unrestricted surface like a screen, but I wanted to give a screen protector the hardest possible test.

A rock, a key and a knife on top of a screen protector.

Adrian Kingsley-Hughes/ZDNET

I rubbed it with a stone …

Hand rubbing a rock on the screen protector.

Adrian Kingsley-Hughes/ZDNET

… a key…

Hand scraping the tip of the key against the screen protector.

Adrian Kingsley-Hughes/ZDNET

Even a knife…

Adrian Kingsley-Hughes/ZDNET

… and the screen protector was completely intact.

Not even a scratch. nothing.

I pressed as hard as I could into the screen protector with a knife.


Press the point of the knife into the screen protector.

Adrian Kingsley-Hughes/ZDNET


I decided to raise the front using a 9 hardness tungsten carbide glass breaker.

I scratched and scratched and scratched, and while I could feel the glass breaking point occasionally catching on the smooth glass, I didn’t make a scratch on the smooth glass after running it for more than a few minutes.

Hold the tip of the tungsten carbide glass breaker against the screen protector.

Even a tungsten carbide glass breaker could not scratch the soft glass.

Adrian Kingsley-Hughes/ZDNET

So, the only thing that is going to scratch your screen protector is a diamond. So if you have some diamonds, keep them in a different pocket from your phone!

On an important note, if you wear a diamond ring, be careful as it can scratch things like your smartphone and car windows.

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The next question in my mind is whether it is possible Tungsten carbide glass breaker Crack the screen protector?

Yes. It took a lot of curl, but it pierced it.

Tungsten carbide glass breaker breaks glass

Adrian Kingsley-Hughes/ZDNET

So, tempered glass screen protectors actually offer a higher level of scratch protection and impact protection, but with the right tools you can still break the tempered glass.

In my mind, a quality tempered glass screen protector is worth the money and will help prevent – but not completely stop – your smartphone’s display from getting damaged.

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