DIY Backplate from a plastic?

[aquaregia]

I've seen some threads about DIY metal backplates, however I'm wondering if it would be possible to make one out of plastic sheet. I ask because I've got a laser cutter that I use for prototyping with MDF, etc, and I've used it with some polymers.
I figure the buoyancy characteristics might be nonideal, but I'm mostly worried about strength / brittleness. Anyone have ideas of any plastics that might work?

 

[mangrovejack]

You could, depending on the type of plastic used. Tobin from Deep Sea Supply makes backplates out of Kydex. However, he reinforces the harness attachment points and the channel with stainless steel. So its more a hybrid. I'm sure if he could get away with just all plastic he would have done that, so I assume the steel is still needed for strength?

 

[GrumpyOldGuy]

Way back when (late 70's) I had an all plastic back plate (Scuba Pro) as did many other divers, I think the called it a AT pack or something. Anyway, it was all plastic and worked fine with singles and a small set of doubles. The problem as you suspected is the buoyancy characteristics sucked.

 

[Couv]

See this great post from Dumpster Diver:
http://www.scubaboard.com/forums/making-your-own-gear/325169-diy-backplate-pvc.html

c

 

[herman]

I have a collection of 60's all plastic BP and use them all the time. Nothing wrong with plastic, esp if metal will overweight you which AL and steel do to me if I am diving warm fresh water.

 

[redacted]

Way back when (late 70's) I had an all plastic back plate (Scuba Pro) as did many other divers, I think the called it a AT pack or something. Anyway, it was all plastic and worked fine with singles and a small set of doubles. The problem as you suspected is the buoyancy characteristics sucked.

There is a plastic BP behind every old Scubapro BCD that gets tossed in the trash. Just unbolt, web, and enjoy