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post #21 of 63
The acrylic could have just been defected. I think this is a safe assumption, even building materials have imperfections.

Its not your fault Syrillian, there are many things that can cause this. Hell, for all we know, it could have been exposed to wild temperatures during shipment and damage the bonding!
    
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post #22 of 63
Thread Starter 
Quote:
Originally Posted by XFreeRollerX View Post
The acrylic could have just been defected. I think this is a safe assumption, even building materials have imperfections.

Its not your fault Syrillian, there are many things that can cause this. Hell, for all we know, it could have been exposed to wild temperatures during shipment and damage the bonding!
It was a particularly hot day when the package arrived and the stuff inside was pretty warm.
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post #23 of 63
If you have another lying around take a look at the edges tilting it a little back and forth under a light. look for the glare coming off the edge if it is flame polished you should see the wavy remnants of the router cut. Each time a blade makes contact, it will dig a very small low spot then after it finishes that depression it will leave a higher spot. very very small but visible maybe 10-15 per inch. Since you have worked with acrylic you should be able to tell the difference from your polished edges. I've seen some of your excellent work.

This could just be an new guy doing the cementing and him getting welding chemical on the polished edge. It could also be switch from cast to extruded acrylic by the manufacturer trying to keep prices down. Acrylic has increased in price recently and extruded is cheaper but more prone to chemical crazing. Contact time with chemical is lower before crazing occurs.
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post #24 of 63
Yeah it could be defective acrylic but it looks like a manufacture problem to me. I go through a tons or acrylic every year and no I'm not exaggerating. That stuff is heavy and I've got to unload it. I have never seen defective acrylic. Anytime I've had problems it could always been avoided with a better fab process.
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post #25 of 63
It was cracked due to the result of a chemical reaction between the acrylic and whatever coolant and/or additives you were using in your loop. Anything that contains most forms of propanol, ethanol, or ethyl based compounds will crack acrylic in just the manor you described.
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post #26 of 63
Thread Starter 
Quote:
Originally Posted by 003 View Post
It was cracked due to the result of a chemical reaction between the acrylic and whatever coolant and/or additives you were using in your loop. Anything that contains most forms of propanol, ethanol, or ethyl based compounds will crack acrylic in just the manor you described.
I've cleaned acrylic with rubbing alcohol before and it has never cracked...
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post #27 of 63
Do not use alcohol, it can stand very diluted alcohol for very short periods of time and there are types or acrylic with chemical resistance but just don't use alcohol to be safe. If you have to use something try mineral spirits or even better use an acrylic cleaner.
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post #28 of 63
Thats weird, most will crack at stress points, barb holes, screw holes...I've used a couple of those and never had any problems with them...I wouldn't mess with it, see if Swifty will take it back...That sux...

If you ever do want to fix one like that take a razor and cut a little line across the bottom of the crack so hopefully it wont get any longer then try to seal it off with a 2 stage epoxie or crazy glue....I just wouldn't ever trust one like that, it looks like it might be coming apart at the seams....Its just not worth risking a leak...Hey you can always just throw a t-line in your loop till you get your res problem resolved....

EDIT: ^^^Your right, just 10% white vinegar and 90% distilled will clean a lot of things like that safely, just rinse it well...
Edited by ira-k - 6/2/08 at 2:19pm
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post #29 of 63
Quote:
Originally Posted by cuy50 View Post
I've cleaned acrylic with rubbing alcohol before and it has never cracked...
Thats the issue. If you use just a tiny bit, it will make it very brittle, but may not crack fully, and then it can crack while in use later.
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post #30 of 63
It really depends on the type of acrylic. If it's that perspex plexiglass stuff, then it should be ok. However some companies elect to use a different type of acrylic with lovely conjugated double bonds that ask to be cleaved.

Some cleaners contain acetone and that's your problem. Acetone dissolves practically everything. Here is a funny story,

"My friend in one of our pracs spilled something on her safety glasses. She then decided to clean them with acetone. After a couple of squirts, she notices that her glasses began to fog up. More acetone was applied. A minute later they broke in half."

ROFL, lessons were learned.
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