[CONSUMER PRODUCT ENGINEERING] -- Why is it that so many dual-layer phone cases these days are using a nearly rock-hard TPU layer, rather than a soft, shock-absorbing Silicone? In my mind, encasing a phone with a rigid shell should do virtually nothing to dampen an impact, so what gives?

I like how you latch on to one (relatively unimportant) sentence from my whole post, presume it to be representative of my entire thinking style, and then accuse me of having a layman's knowledge, despite me being an engineer (and one who actually works with stress and strain, for that matter), only to then try to speak for all of humanity with grand sweeping statements about the preferences of all consumers the world over. Oh, I love it. The irony is so thick I could use it to pad my phone case.

Furthermore, a case nowadays must be slim apart from specific cases that are trying to be bulky and all encompassing.

Thank you for directly contradicting yourself. "A case must be slim, except for the ones that aren't."

It's a good thing we're specifically talking about the bulky, dual-layer "all encompassing" cases in my original post.

Nobody wants a phone that protrudes like crazy out of their pocket

The last 10 years of ever-increasing phone sizes would like to have a word with you.

The dozens and dozens of ultra-bulky cases selling on Amazon for every model of phone, with thousands of reviews each, would like to have a word with you.

The Otterbox Defender line would like to have a word with you.

Additionally we had silicone cases for a few years, nobody liked them

We still have silicone cases. They're everywhere. Amazon has hundreds of listings of well-selling silicone cases. Tons of people like them.

nobody liked how it picked up so much lint and garbage and scratched the closed off faces of the phone.

I've had silicone-lined cases for 10 years continuous now. I work on jobsites, in workshops, on railroads.... dirty, dusty, gritty places. My phone case never picked that stuff up. My screen never got scratched from grit or lint. There's many different formulations of silicone, they're not all sticky.

the goal isn’t to stop shock forces, there’s no reason to do that when the phone is able to handle it. The goal is to prevent any physical impact of the phone against the ground or whatever is being hit.

The goal.... is to prevent physical impact... against the ground.

Thats.... that's called stopping shock forces. That's what you just described. Thank you for contradicting yourself again. To prevent physical impact of the phone against the ground, you must dissipate (read: stop) the impact forces.

You need little flex in a case like that that is meant to stop the phone from slipping out of the case and impacting the ground in a worst case scenario flat face fall.

Slipping out of the case? How... how in the world would it slip out? We're talking about dual-layer cases here. They're completely enveloped in rubber and plastic. The front, sides, and back of the phone are enclosed. There's no way it can pop out.

/r/engineering Thread Parent