Plastic To Plastic Adhesive

[atavist]

I'm trying to bond pvc pipe to a plastic Todd tank... I can't find any mechanical (screw in fitting that fits). I have tried 2 part gorilla glue epoxy but after 48 hours it breaks away under minimal pressure. Most recently I tried 5200 and let it set up for a full week but as soon as I applied a little pressure (which unfortunately due to the fitting placement and pipe regidity is unavoidable) it also seperated on the tank side, and then wasn't difficult to peel off the pvc fitting...

Any suggestions on a plastic to plastic adhesive that will hold up under pressure??

[redbopeep]

1. Might be easier to obtain the plastic fittings that are made for interface with plastic water tanks/holding tanks, etc. Sorry I can't tell you where to find those. This place might be able to help you out: http://www.tank-depot.com Perhaps something like this? http://www.tank-depot.com/product.aspx?id=1758

2.. You could just do a sandwich fitting (inside and out) of something you can find at the home store in PVC using 4200 or 5200 simply as a bedding compound inside and out. Essentially you make a bushing/plate/washer of plastic for the inside and outside that you compress these onto the tank using regular plumbing fittings inside and out. That will work but is more of a hassle and may take up more space than you want. Variations on this theme involve drilling out a hole the right size for your choses plumbing fittings or a fitting with reducer, etc.

Dissimilar plastics (PVC and whatever you've got) probably have dissimilar adhesive properties. We stay away from what we call the "googe-together" type arrangements (glue) and seek out mechanical terminations.

Good luck!

[atavist]

Yeah, Todd actually makes a sandwich fitting for this tank but to install it I have to cut a larger access hole to put the inside fitting on... my issue with this is that it's my septic holding tank and the only place with the space available for the access hatch is on the side... really I guess it should be fine but I just don't like any extra fittings, that might leak, that will be submerged in 'black water'.... this is probably the route I will have to go however...

[MMNETSEA]

Speak to Permabond at THIS LINK they have a series of adhesives - include Loc Tite 495 - activated by UV.

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info.americasATTpermabond.com

Customer Service

Toll Free: 800-714-0170

Direct: 732-868-1372

Helpline

US Toll Free: 800-640-7599

Direct: 732-868-0407

[atavist]

done and done.... I ended up using a 2" to 1&1/2" pvc conversion bushing which is threaded inside and out. I used a wood rasp to ream out the whole to the right size, screwed it in good and tight then gooped it up with 5200 again, which since it didn't adhere well the first time I figure is more of just a sealant than an adhesive in this application. I was then able to screw the desired 1&1/2' fitting into the bushing to connect my hoses... not as solid as a sandwich fitting but I think it is sufficiently strong for the application and keeps me from having to cut an access hatch in the side of the tank.

thanks for your inputs.

[delatbabel]

Plastic is not plastic.

You need to know what types of plastics you are adhering and then contact a specialist for the correct type of adhesive (which in some cases will in fact be a solvent, e.g. joining PVC to PVC).

You generally can't use resin type adhesives e.g. epoxy on most moulded polymers, they won't stick.

[janwaloch]

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Jan