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Old 10/12/2017, 03:04 PM   #1
2_zoa
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Polyurethane sheet

Hey all, I have some super soft polyurethane sheeting that Iíd like to use in my sump under my return pump and skimmer.

My questions are, is it ok to use this in my system? What would it leach into the water? Will it ruin the acrylic that my sump and skimmer are made of?

I donít know exactly what type it is as I get it from work. Itís very soft and is sticky to surfaces. Once you put it down it doesnít move though itís very easy to lift it by hand.

I believe it is this. We get it from mc master carr. Itís most likely the 3000 series.
https://www.mcmaster.com/#standard-p...heets/=19s8t0a


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Old 10/12/2017, 03:09 PM   #2
2_zoa
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I couldnít edit my post.
I believe, Itís the second option down on the left. The super- cushioning.


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Old 10/12/2017, 04:36 PM   #3
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I wouldn't trust it, but it's hard to be sure. People have killed tanks by putting a computer mouse pad into the system trying to do what you're doing. A mouse pad is a particularly dangerous idea, but I wouldn't trust any polyurethane. The Wikipedia page has some information in it that illustrates some of the issues.


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Old 10/12/2017, 05:03 PM   #4
Vinny Kreyling
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Better off with a silicone pad for hot pots @ Bed Bath & Beyond.


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Old 10/12/2017, 05:05 PM   #5
Smokey Stover
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Quote:
Originally Posted by bertoni View Post
I wouldn't trust it, but it's hard to be sure. People have killed tanks by putting a computer mouse pad into the system trying to do what you're doing. A mouse pad is a particularly dangerous idea, but I wouldn't trust any polyurethane. The Wikipedia page has some information in it that illustrates some of the issues.
Oh no, Does that go for the closed cell foam leveling mats? I have some scraps under my skimmer and return pumps. I think I'll remove them until sure.


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Old 10/12/2017, 05:57 PM   #6
bertoni
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I don't know enough about the final contents of any polyurethane product to be sure what might happen. They might be safe enough, but I'd wait for some comments from someone with a strong chemistry background before trusting anything, personally.


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Old 10/12/2017, 06:20 PM   #7
karimwassef
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I used spray foam in my sump without issue


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Old 10/12/2017, 06:26 PM   #8
2_zoa
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Thank you all for the replies.

Whatís the opinions on these? They are silicone and just the right diameter for my skimmer.
https://www.amazon.com/gp/product/B0...EDZV2SDT&psc=1


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Old 10/12/2017, 06:33 PM   #9
Smokey Stover
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Quote:
Originally Posted by bertoni View Post
I don't know enough about the final contents of any polyurethane product to be sure what might happen. They might be safe enough, but I'd wait for some comments from someone with a strong chemistry background before trusting anything, personally.
Same here, Thanks for the heads up. I'd rather err on the side of caution. I wasn't sure about that foam, It floats, but thought thicker would be better at sound/vibration dampening.
It's only been in the sump a couple days, After the Irma re-start. So back to the silicone hot pot pads which I'd been using.

Edit: Those in your link look better than mine. Thicker and black. Mine are Red,Green,Blue and orange.



Last edited by Smokey Stover; 10/12/2017 at 06:39 PM.
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Old 10/12/2017, 07:37 PM   #10
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There are some poly sheets that is Food Safe.. If you know the exact brand of what you have see if you can find msds sheets on them. It will say food or food prep safe if they are OK For the tank. many resins are urethane base products.

NOPE This is not a answer just thoughts


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Old 10/12/2017, 07:51 PM   #11
bertoni
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I agree that food-safe products are likely a good bet.


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Old 10/13/2017, 11:25 AM   #12
orcafood
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from wiki:

"Some noteworthy recent efforts have been dedicated to minimizing the use of isocyanates to synthesize polyurethanes, because the isocyanates raise severe toxicity issues. Non-isocyanate based polyurethanes (NIPUs) have recently been developed as a new class of polyurethane polymers to mitigate health and environmental concerns."


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