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Pet Forum / Aquaria / Marine Reef / October 2005Bonding Agent Question (sump)
Been a long time since I've been on the newsgroup (my program trashed m history, and I never fixed it until now) I have a large 150 gallon rubbermaid-esque sump that I am placing large polyethylene container inside of. I need to find a way to get th container to stick to the bottom when water is in it (this is acting as a overflow, so the outside water is higher than the inside water). There i a lot of surface area on the bottom of this container (greater than square foot) so I was thinking that I might be able to get away wit silicone even though it doesn't stick well to plastics. Does anyone know o anything better Thanks Jare > Been a long time since I've been on the newsgroup (my program trashed my > history, and I never fixed it until now). [quoted text clipped - 8 lines] > anything better? > Thanks, Hi, Tough application. PE is typically electo-welded in industry to get good bond strength, and is not amenable to most adhesives. The fact that you only need it to not float may be a saving feature, though. The actual bond strength you need will be relatively low. Putting a weight in the PE container as an added measure is a good idea. I'd take a shot at it with a multipurpose silicone or marine adhesive from your DIY store, and leave a weight in the bottom of the PE container (1/2 - 2/3 the weight of the container in aquarium gravel?) after welding. Pre-treat the PE before trying to bond it, too. Clean your rubbermaid container with acetone, and allow to dry. If you have a blow torch, go over your PE bond surface quickly with a (cool) yellow flame, until the surface becomes shiny. This will burn off any processing oils or detritus, and oxdize the PE a bit, giving you your best surface for bonding. The PE should be allowed to cool after this treatment, but be sure to not touch the bonding surface after doing so, and bond the surfaces immediately once the PE part can be handled (you can check temperature carefully on the interior bottom of the PE container). If you don't have a torch, at least clean both surfaces with acetone, and allow them to dry before trying your bond... Good luck! Regards R. David Zopf Atom Weaver The amount of force that will try to lift the container will be equall to the volume of air in container that is equivilant to the difference in water level. So if your container is completely empty, and the water around it is all the wat to the top of the container, then the upward force will be the same as the downward force that the container would have sitting on the floor full of water. That's a lot of force to try to keep down. Also the way those containers are designed if flexable, they hold an outward force better than an inward (crushing) force. However if your inside containger is verry rigid and round like a 5 gallon bucket, then it will better handel that crushing force. You might also consider puting the inside container against the side of the sump, and drilling some holes throught. Hold it together with plastic bolts, and use some silicone around the perimiter of the hole to act as a rubber seal. Or how about putting a bulkhead in the side of the sump, and using pvc pipe. Wayne Sallee Wayne's Pets Wayne@WaynesPets.com thePoet wrote on 10/25/2005 8:32 PM: > Been a long time since I've been on the newsgroup (my program trashed my > history, and I never fixed it until now). [quoted text clipped - 9 lines] > > Jared The containers are very solid, mid-density, polyethylene "buckets designed to hold all sort of nasty chemicals. They're very solid and I don' expect them to have issues with the outside force. They are currentl connected, via vinyl tubing and bulkheads, to the outside of the of th water trough . The in-flow container will be full at all times. Th outflow container will be 3/4 full of water and the air space would equa around 3 gallons. So, I'd guess 25 to 34 pounds worth. I can't easil place sand at the bottom since it is acting as an overflow Jare |
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