Good Glue advice

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Tal Tracyn

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Post 2017.07.24 11:27

Good Glue advice

I need some advice on a good glue that is heat and water resistant for use on plastic.
The item in question will be immersed in hot water.
Normal super glue isn't cutting it and just crystalizes and falls apart.
Help !
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Padme Katana

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Post 2017.07.24 12:37

Re: Good Glue advice

An epoxy resin glue. My personal choice would be Araldite, which comes as two tubes which you mix and apply. But check it out as there are several types and they have different properties, some have a higher melting point than others. Strong though.
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Troven Smalvard

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Post 2017.07.24 12:40

Re: Good Glue advice

EDIT. Padme beat me to it but i vote epoxy too

does it have to be non toxic.... are there fish in this water?
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Ashley Sokolov

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Post 2017.07.24 14:29

Re: Good Glue advice

I also vote on epoxy, this glue will be harder than your plastic but you will have to give it usually 24h to harden.
There are food grade epoxies, they are more expensive and harder to get but exist.

re: superglue, are you glueing it wet? Superglue is activated by water which means that if part is wet or submerged in water before hardening completely it will create weak structure.
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Yuri Titov

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Post 2017.07.24 15:07

Re: Good Glue advice

Some hard plastics like polyethylene or polypropylene are a pain to glue together. Superglue fails probably because it can't get a bond with the surface, you can tell if it comes off leaving completely clean plastic. I'm gonna guess that regular araldite won't bond with hard plastic either btw.
You can get some specialised plastic glues but it helps to know the type of plastic. Loctite has got a plastic glue which i used in the past with average results.

Make sure you wash the parts with washing up liquid to degrease them and if possible abrade with sanding paper a little to increase the surface area.
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Onzo Yoder

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Post 2017.07.24 17:07

Re: Good Glue advice

Here you go: http://www.thistothat.com/
Site let's you pick the materials and it spits back what glue is good to use.
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Yuri Titov

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Post 2017.07.24 17:16

Re: Good Glue advice

http://m.loctiteproducts.com/p/4/0/2/sg ... ing-System

Dat^^^^

You'll get that at screwfix or b&q
Oh and it will also depend o how hot the water is
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Tal Tracyn

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Post 2017.07.24 22:31

Re: Good Glue advice

Padme Katana wrote:An epoxy resin glue. My personal choice would be Araldite, which comes as two tubes which you mix and apply. But check it out as there are several types and they have different properties, some have a higher melting point than others. Strong though.


Tried Araldite its not resistant up to the temperatures required and just crystalizes.
Temp range on it is from 30-69c ish
I need something that can handle hot water.
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Troven Smalvard

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Post 2017.07.25 06:25

Re: Good Glue advice

this thread is gaining traction, i really need to know what your fixing! :D

30 - 69c so its not fish then....
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Tal Tracyn

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Post 2017.07.25 08:18

Re: Good Glue advice

Troven Smalvard wrote:this thread is gaining traction, i really need to know what your fixing! :D

30 - 69c so its not fish then....


Thats the temp range on Araldite the temps i'm talking about is boiling water which is way higher than what most glues and epoxys can handle.
So yes totaly not a fish tank :)
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Tal Tracyn

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Post 2017.07.25 08:36

Re: Good Glue advice

Heres the deal. I am fixing ...ready for it !
My Dishwasher !
Basicly the spinning spray arm has snapped off.
Now it has snapped off at the threaded part which the spray arm screws on to.
The thread is in 2 pieces and what is left on the pipe is to small to screw the arm back on so i am glueing a small thread piece back on to the main pipe then screwing the spray arm on.

This HAS worked several times with superglue BUT because there is hot water flowing through the pipe the glue will eventually breakdown and the arm just falls off again.

I've tried..
Superglue (loctite)
Gorilla glue
Araldite (Epoxy)

And before you ask NO i can not find a replacement part. Trust me i have looked.
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Treatle Omaristos

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Post 2017.07.25 09:09

Re: Good Glue advice

If you are looking for a sealant to use on a hot water system have a look at Fernox LS-X. The guy at my local B&Q recommended it and it worked for me. One word of caution though, it does form a flexible seal so it might not be suitable for a spinning rotor arm.
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Troven Smalvard

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Post 2017.07.25 10:01

Re: Good Glue advice

why are you keeping fish in your dishwasher???


but more serious and suited to space nerds, have you tried looking at 3D printing a replacement ?
i hear its the future! :)


Or is it possible to drill through the remainder thread on the spray arm and pipe and wirelock it?
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David Matsuda

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Post 2017.07.25 10:50

Re: Good Glue advice

Not all epoxy products can handle the heat and exposure to water, but most brands should have something that can. Regular J-B Weld is probably available in most places and is rated up to 260 °C constant exposure.

Depending on the size of the part and how much thread you've got to work with, welding it with a soldering iron and cleaning up the thread with a needle file might also work as a last resort.
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Tal Tracyn

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Post 2017.07.25 17:30

Re: Good Glue advice

J-B Marine weld looks like a good option.
It can take heat up to 200c and is water proof.

Fernox LS-X is just a silicone sealant and not really a glue.

Plastic welding it isn't an option because there is only about 1 -1.5 of threads thats broken off.
Not enough to weld i don't think.
Plus i've never done it.

I'll order some J-B weld and see how thats goes.
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