1/4" Lexan

Where do you guys buy your 1/4" lexan(polycarb) for a reasonable price?

Also where can I get some light blue polycarb?

I’m not sure you’ll be able to easily source light blue polycarb. Your best bet is painting the clear stuff. I know people who have had good results with this transparent spraypaint on plastics.

I like estreetplastics.com for our 1/4" smoked stuff, but I recommend trying to find a local source/sponsor for 1/4" clear polycarbonate.
https://www.estreetplastics.com/Polycarbonate-Lexan-Sheets-s/316.htm

I know you only asked about 1/4", but here’s where I like to get thinner stuff for lower load applications.

1/32" - West Coast Products - This stuff is my absolute favorite for sponsor panels and places where you’d need a lot of surface area coverage but not a lot of stiffness.
http://www.wcproducts.net/217-6626

1/16" - WCP - same as above, but a little thicker. AM is also a good source, but their sheets are smaller.
http://www.wcproducts.net/217-6626

1/8" - AM / estreet

https://www.estreetplastics.com/Polycarbonate-Lexan-Sheets-s/316.htm

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Sometimes there a good deal on Amazon.

But we usually get it from McMaster or andymark.

Try to contact local sponsors to see if they have any scraps. Around my team, there are 4 large automation companies (if not more) that use 1/4" polycarbonate very often. They use it for protective panels and things like that, so sometimes a 30" x 30" piece is scrap. We visit one sponsor every fall and collect what scraps they have to use. We have been lucky to find black, tinted black, and clear 1/4" poly, along with 3/8" and 1/2" thick. Since I work at an Automation company also, I’m able to pick out the scraps we have to let the team use. That’s how we were also able to get HDPE for our practice field this year.

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We get ours from a local store (we have a Tap Plastic 0.5 miles from the school) and have in the past have gotten donations and discounts from them.

From their site:
“Nominal 1/4” Thick (actual thickness will be approximately .189" to .250")."

Have you seen that kind of thickness variation from estreet? The price is good, but +0 -0.06 variation is a little nuts on a .25" nominal.

Truthfully, none of our 1/4" lexan applications have required any tight thickness tolerances.

I just measured a bunch of parts cut from sheets bought in Spring 2018, Fall 2018, and Spring 2019. They all measured 0.230" ± 0.005".

YMMV obviously!

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.06" under sounds like a pretty misleading advertisement.

The nominal 1/4" polycarbonate sheet from our supplier comes in at .235 or so… A suspiciously metric number.

The nominal 1/4" acetal copolymer we buy comes in at .265 or so.

When we do tab & slot construction using our laser, we just have to measure everything to ensure the slots and tabs will fit right.

Thanks! That’s great information to have. Small thickness variations can mess up an assembly without you noticing it sometimes. .230 +/- .005 isn’t too bad though.

We get ours from a local store that donates it, I would highly recommend looking around in your area, usually places will donate scraps for free and might even give you a sheet or two if you contact them about a sponsorship.