best epoxy/adhesve for plastic

[finefurn]

I have a Shurflo 2901 water pump with a broken outlet nipple. I don't know what composite the pump body is molded from, it's some form of plastic. What type of epoxy or adhesive would be best to repair a crack and broken off outlet nipple.

[GrahamMatthews]

Originally Posted by finefurn

I have a Shurflo 2901 water pump with a broken outlet nipple. I don't know what composite the pump body is molded from, it's some form of plastic. What type of epoxy or adhesive would be best to repair a crack and broken off outlet nipple.

This spring I faced the exact same dilemma with a Shurflo pump I was installing as an anchor wash down. I used West System G flex. Truly remarkable product that seems to be functioning really well.
I located my spare head piece but have had no reason to use it. The repair is holding up so well.

[Jammer]

I've used G/Flex and it works better than anything else for that. Might not hurt to mix in a little filler to thicken it up. Materials cost may end up exceeding the price of a new pump though.

[travellerw]

Originally Posted by finefurn

I have a Shurflo 2901 water pump with a broken outlet nipple. I don't know what composite the pump body is molded from, it's some form of plastic. What type of epoxy or adhesive would be best to repair a crack and broken off outlet nipple.

Its highly likely that the pump body is molded from Glass Reinforced ABS plastic. Although there is no easy way to tell for sure, there are some simple tests. First if the plastic is black and NOT glossy smooth, thats a good indicator of ABS. Second, try and cut a small piece with a razer knife. If you hear crunching, grinding, thats the glass reinforcement. However, even with those tests its very hard to tell the difference between ABS and Nylon when they are glass reinforced.

In any case, I think your best chance for a good repair is using a quality Epoxy. Possibly even reinforcement with some glass matt.

[fritzdfk]

I have used System Three: https://www.systemthree.com/products...hesive-sealant

I have had good luck with plastics as long as you flame treat before bonding.

[Bill Seal]

Loctite Plastic repair. It's called epoxy, but smells like acrylate (super glue) which I think it's based on.
Acrylate based goop is what your dentist uses to fill cavities.

[James S]

I haven't tried the above suggestions but they sound pretty good... having said that.. if this pump is below the waterline with a normally open seacock I would consider the down side if this repair fails...

[finefurn]

Originally Posted by fritzdfk

I have used System Three: https://www.systemthree.com/products...hesive-sealant

I have had good luck with plastics as long as you flame treat before bonding.

Not sure what you mean by "Flame Treat"

[fritzdfk]

Originally Posted by finefurn

Not sure what you mean by "Flame Treat"

From System Three:
Flame treating is the act of very quickly passing a flame (a propane torch, for example) five or so inches
away from the surface. Search “flame treating” on You Tube (www.youtube.com) to see examples of
this in action. The hot oxidizing portion (yellow) of the flame oxidizes the surface of the plastic thus
raising the surface tension. This allows the SA-2100 to “wet out” and bond to the surface. Note that the
flame should not melt the surface. Melting is seen as a glossy surface. If his happens sand the surface
with fine paper to dull it and re-flame. Water will bead up on an untreated surface but flow out on a
properly flame treated surface. Bond immediately to the treated plastic surface.