Droid RAZR Kevlar

Kevlar, as law enforcement and military personnnel have known for quite some time, is a hell of a thing, stopping bullets and saving lives. So what's it doing on the back of a smartphone? In the case of the Motorola Droid RAZR, it's serving as a pretty cool spec, and it looks darn good, too.

No, we're not going to shoot the RAZR. Pretty sure it'll lose that battle. And while it's not completely scratch-proof, it does stand up to a pretty decent amount of pressure.

Check out our complete unscientific video after the break.

Read our complete Droid RAZR review!


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Reader comments

Key meets Kevlar on Droid RAZR

36 Comments

Kevlar isn't inherently bulletproof...to make bulletproof they stack layers and layers of woven kevlar stacked on top of each other which can effectively diffuse the force of a bullet while not allowing it to break through.

It will only stop pistol rounds... Rifle rounds will go right through, unless you have some hard ceramic plates...

And the funny thing is that camera hump and the bottom border of corners of a phone are the parts that likely gets scratched.

Or the screen! Hey, may be they should create a screen made of kevlar! ;P Or just don't put your phone in a pocket with something that will scratch it! Or better yet, use a holster (function over fashion)!

Gorilla Glass does a great job of preventing scrathes. I have never had a screen protector on my Droid X & my screen is still as flawless today as it was 15 months ago.

I have had it in my pocket with keys and anything else that happens to be in there.

Consider yourself lucky. I've heard of many people getting scratches (even with Gorilla glass or whatever hardened glass), even broken displays by putting a phone in a pocket with keys and such. Why take the risk? That's why I prefer to put it in a holster.

I happen to think that holsters, belt clips, or whatever you want to call them look totally idiotic, but to each their own.

Besides, I wouldn't be able to feel it vibrate when I am at work or in meetings if it were on my belt.

LOL Yah, I'm sure I look geeky stupid. But, I'm old enough to not care anymore. Function over fashion! And yes, to each his own, kevlar marketing gimmicks and all. :)

I had way more damage to my cellphone during my tragically misguided years as a holster bolster (due to running the phone into things) than I have with dedicating my right pocket for phone-only use... Unless you are the kind of person who goes all out and gets a police style chest holster for your phone... Oh the humanity.

As someone who has scratched a phone with gorilla glass, it's definitely possible and if your slightly anal like me, I can only deal with a scratch on my phone screen for a few weeks before it bothers me so much that I buy a new phone, note that after that one phone that I trusted with simply gorilla glass I've made sure I have screen protectors before I even take the phone out of the box.

In my experience it's best to have a good case and a screen protector both have saved my phone countless times from dropping and scratches, I'm too active to deal with worrying about being super careful with my phone, also a screen protector and case protect much better than a holster, you can still easily scratch the screen when it's out of the holster or the back and sides anytimes, plus holsters are really uncomfortable any time you have to sit or walk a lot.

oooo i was waiting for this! :)
really, im waiting for someone to shoot it...with different caliber guns...and post it on youtube :)

Phil I love your videos but this one amused me a bit. You shoot a video to demo the strength and during the actual test suggest, "well you can't really tell on the video..."

He said you couldn't really tell how hard he was pushing.

I'm not aware of any why to show pressure on a video without a strain gauge.

You have to take his word that he was pressing hard enough to scratch mere plastic. You take his word on all the other reviews he does, why call him out on this one?

Kevlar as stated above is only bullet proof when woven to be. Kevlar is also by no means puncture resistant and is barely cut resistant. So scratch testing thekevlar back is a moot point since its not supposed to resist such things on a phone. Its simply a marketing ploy.

Wait....

You can't claim in the same sentence that kevlar is not supposed to be scratch resistant, and then dismiss a video showing that it is in fact scratch resistant.

Further, there is no reason to suppose the Kevlar is NOT woven, as that is its main claim to fame.

Two things make woven kevlar good. One it is approx. five times stronger than the comparable material and can withstand up to 700 degrees F without the temp affecting the material.

So, even though it is not bullet proof as a rear back for the Razr, it does serve a purpose other than looks and scratch resistance.

It is kevlar because using carbon fiber would violate Apple's on board radio damping feature. Granted Apple used the users finger but I'm sure that the patent lonely covers all radio phone signal damping strategies included the use of modern chic composites like carbon fiber.

So, the kevlar would have nothing to do with the scratch resistance of the back of this phone. That's determined by the resin matrix that is bonding the kevlar fibers together. In fact, by curing the fibers into a composite, the resilience of the fibers to impact is greatly reduced (due to stress concentrations). the trade off is, you get a material that's very strong structurally, so if you plan on placing you battery cover under axial loading, you should be in luck.

On the whole, I have to say that the kevlar back is nothing more then marketing. But like others have said, it does look cool. I'm curious why it is black like carbon fiber though, in my experience kevlar fibers are usually white/yellowish.

You don't know any of that, and you couldn't with out microscopic inspection of the construction.

If the kevlar fiber that make up the back of the phone were at the surface it would have a rough appearance, pretty much as the video shows.

The resin would be below the surface and not subject to scratching, being protected by the kevlar itself.

However, kevlar itself does not always need a resin matrix because its fairly mold-able all by itself. Its not at all like carbon fiber.

That part of my Droid X has NO scratches. Not because it is made out of Kevlar, but because of the inherent way the arched camera keeps it off of the table. That and I never put it in my pocket with ANYTHING else. I still don't see how this is a "feature" to the phone other than to help Motorola: They can now get away with the un-removable battery and they can charge you more at the same time. Not a positive "feature" if you ask me.