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Old 10/13/2018, 10:11 PM   #1
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Join Date: Jan 2009
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HDPE for baffles?

I have a question. I am building a new DIY sump and I am looking to save a few bucks as well. I bought a 75 gallon glass tank from Petco on sale to use for the sump. I have made baffles on my current sump with lexan & acrylic, but I found HDPE sheets much cheaper than the acrylic. I used aquarium safe silicone on my current sump to bond the baffles to the glass and its held up pretty good for 2 years now. Will the silicon work just as well on the HDPE?

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Old Yesterday, 04:08 PM   #2
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As i understand, it will stick worse if not equal to HDPE as to acrylic. But as with acrylic you can sort of cheat by sandwitching the baffle with silicone fillets on both sides and it will probably be fine for a long time.

I can't imagine HDPE sheeting being cheaper than glass though... glass is cheap.

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Old Yesterday, 11:39 PM   #3
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You won't be able to bond silicone to hdpe, you might be able to create a silicone gasket that sticks to the glass, but it won't stick to the HDPE.

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Old Today, 05:32 AM   #4
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I see, the silicone seems to hold the lexan / acrylic I used on my first sump build. Trying to do the same thing with HDPE may not hold as strong as it does with the acrylic?

I was going to use black HDPE for some of the baffles because it is for the refuge section and I didn't want the fuge light to bleed over. Into the skimmer chamber.

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