2mm Polycarbonate vs. 3mm Acrylic

Talk about anything and everything here within reason.
Post Reply
User avatar
rg12   100 kW

100 kW
Posts: 1014
Joined: Jul 26 2014 4:22pm

2mm Polycarbonate vs. 3mm Acrylic

Post by rg12 » Apr 30 2019 5:38am

Which is stronger/less likely to crack? (not for drilling)
24S 17.5Ah 25R, Greentime Controller, QS203 5KW

Rube   100 W

100 W
Posts: 251
Joined: Jun 25 2016 10:18pm
Location: Brisbane, Australia

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by Rube » Apr 30 2019 6:08am

Polycarbonate, what do you intend to use it for? Keep in mind it's hygroscopic. Edit, just realised your comparison thickness varies so maybe the acrylic depending on the application.

User avatar
rg12   100 kW

100 kW
Posts: 1014
Joined: Jul 26 2014 4:22pm

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by rg12 » May 01 2019 9:18am

Rube wrote:
Apr 30 2019 6:08am
Polycarbonate, what do you intend to use it for? Keep in mind it's hygroscopic. Edit, just realised your comparison thickness varies so maybe the acrylic depending on the application.
It will protect a battery pack with cell holders, sit flat on it, from experience heavy battery packs if not handled with super care make the 2mm acrylic crack from very light hits.
24S 17.5Ah 25R, Greentime Controller, QS203 5KW

Bobw   10 mW

10 mW
Posts: 24
Joined: Jun 20 2017 4:30pm
Location: Edmonton, Alberta

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by Bobw » May 01 2019 1:19pm

Not sure exactly what you are planning to do around an enclosure, but 2mm acrylic would not make a very strong unit and might be subject to flexing and cracking as you thought it might.
I have some experience with using acrylic, I used 4mm to build the battery and controller box on my ebike. The battery itself is 96 18650 cells and there is additional weight with battery connectors. I wanted to use 6mm material but settled for 4mm when I found a half sheet for a good price. I’m going into the 3rd year of service on my bike and so far, no issues with the acrylic box. I used acrylic solvent to glue the joints together, the result is strong and light. I guess what I am saying is that if you choose to go with acrylic, use 4mm not 2mm.
Hope this helps.
Attachments
16D5F619-AB33-4CF2-9A36-3FF1970C4E61.jpeg

User avatar
fechter   100 GW

100 GW
Posts: 14053
Joined: Dec 31 2006 3:23pm
Location: California Bay Area, USA

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by fechter » May 01 2019 1:44pm

Polycarbonate is much more impact resistant. Also melts at a higher temperature. I've used it as an insulator in pack builds before.
"One test is worth a thousand opinions"

User avatar
MJSfoto1956   10 kW

10 kW
Posts: 612
Joined: Jul 28 2010 9:28pm
Location: Boston, MA

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by MJSfoto1956 » May 01 2019 2:25pm

I'm using 6mm "greenhouse glazing" for my battery box and spacers between banks (for ventilation). Lightweight and strong.

e.g. https://www.teksupply.com/contractor/su ... carbs.html

Image

M

User avatar
rg12   100 kW

100 kW
Posts: 1014
Joined: Jul 26 2014 4:22pm

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by rg12 » May 01 2019 6:38pm

fechter wrote:
May 01 2019 1:44pm
Polycarbonate is much more impact resistant. Also melts at a higher temperature. I've used it as an insulator in pack builds before.
I have a real space limitation where every millimeter counts so I need to know if a 2mm polycarbonate will be at least as strong as 3mm acrylic if not stronger.
24S 17.5Ah 25R, Greentime Controller, QS203 5KW

User avatar
fechter   100 GW

100 GW
Posts: 14053
Joined: Dec 31 2006 3:23pm
Location: California Bay Area, USA

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by fechter » May 01 2019 7:16pm

rg12 wrote:
May 01 2019 6:38pm
I have a real space limitation where every millimeter counts so I need to know if a 2mm polycarbonate will be at least as strong as 3mm acrylic if not stronger.
It's nearly unbreakable as long as it doesn't get exposed to certain chemicals, like diesel fuel or cutting oil. The stuff I'm using is 1/16", whatever that is in metric. You can hit it with a hammer and it won't crack. It should be very good in your application. Thin stuff you can cut with tin snips.
"One test is worth a thousand opinions"

User avatar
rg12   100 kW

100 kW
Posts: 1014
Joined: Jul 26 2014 4:22pm

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by rg12 » May 02 2019 2:24am

fechter wrote:
May 01 2019 7:16pm
rg12 wrote:
May 01 2019 6:38pm
I have a real space limitation where every millimeter counts so I need to know if a 2mm polycarbonate will be at least as strong as 3mm acrylic if not stronger.
It's nearly unbreakable as long as it doesn't get exposed to certain chemicals, like diesel fuel or cutting oil. The stuff I'm using is 1/16", whatever that is in metric. You can hit it with a hammer and it won't crack. It should be very good in your application. Thin stuff you can cut with tin snips.
That is amazing!
24S 17.5Ah 25R, Greentime Controller, QS203 5KW

User avatar
fechter   100 GW

100 GW
Posts: 14053
Joined: Dec 31 2006 3:23pm
Location: California Bay Area, USA

Re: 2mm Polycarbonate vs. 3mm Acrylic

Post by fechter » May 02 2019 7:51am

A thick piece of polycarbonate will stop a bullet without cracking. Get some scraps and try breaking them.
"One test is worth a thousand opinions"

Post Reply