Acrylic fabrication questions? I can help!

I bought some acrylic from a plastics company here that is cell cast but just has plain brown protective paper on it. No name or anything on it. My question is, will it be ok to use or will I have issues with it making strong seams??? If it matters it is 1/2" material.


The tank I am wanting to make is 44"x24"x16". All the pieces are 1/2" material but I still need to buy another sheet to make the eurobracing. I want to buy 3/8" because it is like $65 cheaper for another sheet. My second question is, should I use the 1/2" thick material that I already have cut for the bottom or should I use the 3/8" material for the bottom piece and the 1/2" piece to make the top eurobracing?? Does that sense?

Not knowing what the acrylic is, unfortunately your guess is as good as ours. The plastics company you bought it from should be able to tell you exactly what it is. If they can't or refuse, that's your second reason to be concerned.

Agree on the bracing. Put the 3/8th on the bottom, 1/2" up top.
 
I bought some acrylic from a plastics company here that is cell cast but just has plain brown protective paper on it. No name or anything on it. My question is, will it be ok to use or will I have issues with it making strong seams??? If it matters it is 1/2" material.
Every once in while you'll find Acrylite acrylic that has plain brown masking on both sides but this is very rare. It's likely a plastic called Acrycast or another import. There are a coupla ways to verify but difficult to explain in writing. In a nutshell, unless you have the documentation that says exactly what plant it was made in - it's essentially garbage for our application as you can't count on it. We need material we can count on. IMO take it back and get good material, namely; Polycast, Acrylite GP, or Plexi-Glas G.

FWIW, if it is Acrycast, there are 6 different plants the material is made in throughout the world, all with varying techniques and quality controls. This is one of the reasons you can't count on it. If it's another brand - it's a crap-shoot and still nothing we can count on.

Out of curiosity, is the paper masking paper thin like tissue/crepe paper or thicker?

HTH,
James
 
Well, as far as asking to bring it back, how would that work out? What would you tell the company, the acyrlic sucks and I can't use it?? Lol I bought the stuff like 4 months ago and I had them cut it for me. My guess is that I'm out $240. I'm ****ed. Well, the paper is not thin like tissue paper. It is just as thick as plexiglass g paper I have. Well, maybe a bit thinner but not by much.
Out of curiosity, why would it not be ideal?
 
Out of curiosity, why would it not be ideal?
Because not all cell cast acrylics will hold a joint, to put it simply. The 3 brands I recommend are fairly consistent from batch to batch and with each other. Most import brands are very inconsistent and tend to have molecular chains which are too long to hold a joint very well. You need molecular chains which are long enough to resist crazing and other stresses yet short enough to break down under chemical stress (solvents and WO 40)
In other words, they don't glue up well as compared to the 3 "good" brands and the joints tend to fail no matter what bonding process you use.

James
 
I called the company where I bought it(laird plastics) and they get their cell cast sheets from Arkema(altuglas.com). I called arkema and was told that it is plexiglass g manufactured in Mexico. So, any thoughts????
 
Eran,
Laird also buys from various other companies - not just Arkema.
FWIW, I have never seen Plex G with no writing on it. Not saying it can't happen, but I tend to doubt it.

OTOH, use it if you want to, not sure what else to tell ya :(

James
 
Eran,
Laird also buys from various other companies - not just Arkema.
FWIW, I have never seen Plex G with no writing on it. Not saying it can't happen, but I tend to doubt it.

OTOH, use it if you want to, not sure what else to tell ya :(

James

Thanks for your help james. I was trying to get all the info that I could to share with you and get your thoughts. I will call laird again and see if I can get more info out of them.
 
Eran,
Laird also buys from various other companies - not just Arkema.
FWIW, I have never seen Plex G with no writing on it. Not saying it can't happen, but I tend to doubt it.

OTOH, use it if you want to, not sure what else to tell ya :(

James

actually all the plexiglass "g" i have been getting james out here in vegas from sabic, formerely" ge polymeres" has brown paper with just a 2" wide piece of clear masking tape that says plexi "g"... and it falls off pretty easy lol...
the only other one i run across with plain brown is tru cast it normally has a small sticker in the corner...thats why i got different scrap piles lol...
 
actually all the plexiglass "g" i have been getting james out here in vegas from sabic, formerely" ge polymeres" has brown paper with just a 2" wide piece of clear masking tape that says plexi "g"... and it falls off pretty easy lol...
the only other one i run across with plain brown is tru cast it normally has a small sticker in the corner...thats why i got different scrap piles lol...
Hmm, maybe the newer stuff is moving in. Up here it still is the old stuff, at least the heavy gauge, I never see anything less than 1/2".

If that's the case, my bad, it just may be Plex G

Acrycast and a couple others come in plain brown wrappers as well. There are certain distributors that are infamous here for bringing in the cheapest stuff.

James
 
Hello Acrylics. Got a project in my head and you may be the man to help me. Setting up a new tank and I'm exploring filtration options. Long story shorter, I like the waterfall filters they use for ponds and I'm considering fabricating one for the new tank. Kind of an HOB on steroids. The advantage would be that I can make it large enough to hold several gallons of media,(as well as my heaters) more than even the largest canister. I like the waterfall back into the tank for surface aggitation, flow and oxygenation. More to the point, I'd be running a Dart pump through it, about 3000GPH, not that much for these types of filters, but plenty for my tank. I figure two 1 1/2" bulkheads up through the bottom from the pump. From a fabrication standpoint, would 1/4" acrylic or polycarbonate suffice?? The filter would be solidly supported on a shelf, NOT hanging off the tank rim. I anticipate finished dimensions roughly 24Lx12Wx12H, with probably a 20" spillway going over the rim and back into the tank. Never seen anything like this done in an aquarium, but it's common in ponds and again it comes down to being a HOB on steroids. I could just buy a pond waterfall filter and be done with it, but if I do my own I can make it exactly the size and configuration I want....PS. I have done a "little" acrylic work for other projects, but small stuff that didn't have to hold water, so it's new turf for me.
 
Catfish52, if I understand correctly, you're just wanting a small tank that your main tank will overflow into? If so, sure - 1/4" will do provided you put a perimeter flange on there (aka eurobrace) I'm not a fan of making anything out of 1/4" without a top flange on it.

If this isn't what you're referring to, a drawing or sketch would help :)

James
 
Essentially yes, an external tank, approximately 15 gallon capacity, fed by my pump, which will empty back into the main tank. Sounds like you'd consider 1/4" too flimsy without the top brace. What would you recommend that would be stiff enough to stand on its own........That's why I'm here, I just pulled 1/4" out of my butt as a starting point. I really have no idea what's needed.
 
I would use 1/2" material to make it rimless.. 3/8" will deflect and cause unecassary stress on the joints.. Like James said I don't even play 1/4" for anything..
 
Well, I wish I could say what I got looked the same. I called
laird again and now they say the sheet I got was from some place in
Indonesia.

Any ideas what I could do with a $240 sheet of 1/2" crap acrylic???
 
this is the manufactures link that laird gave to me.

so what is chem cast good for???? what the heck am i going to do with this? should i make the tank and see what happens. I mean the pieces are already cut?? dare I ?
 
Chmcast is made by Plastiglas de Mexico in Mexico, so if it's made in Indonesia - it's just cheap cell cast. Acrycast if I had to guess, Laird is now owned by the same company that owns Calsak, who only sells cheap acrylic, at least around here so maybe they're pooling orders.

Personally, I'd do a couple of practice joints and see how it goes if you have the material, but I simply would not build a tank from it. If it doesn't go well, let me know and I'll make sure you get the right material. I have friends in low places too ;)
That, and I'll be in the bay area for a coupla days, and I like to yell at people in person :hammer:

James
 
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