High temp adhesive for plastic

[WizardOfBoz]

Ok, not an industrial question, but...

My wife dropped the lid to our instant pot. The lid has a handle on top, and two ears on the side, all cast in a phenolic (matte finish though) plastic. One of the ears got cracked. not completely separated, but cracked and week. It's an area with a very short screw going into the ear from the inside of the pot.

My plan is to drlll out a through-hole for the screw, adding a flat-head countersunk nut to the outside and using a bolt and not a screw from the inside. In addition, I want to glue the plastic where it cracked.

My go-to adhesive solution is West Systems G/Flex 650. However, it lists a heat deflection temperature of 127°F. The description says that it can routinely handle temps up to 200°F.

Is that enough high temperature performance? Is there a better high temp resistant adhesive?

 

[Joe Gwinn]

Maybe this will do?

Loctite® EA9017

Check that it's food safe...

If I understand this, the epoxy would be outside the lid, and thus is not involved with the food inside the pot.

Slow-setting epoxies that require heat to cure are typically far stronger than other kinds. And one can embed a brass threaded insert or two in the lid ear.

 

[henrya]

Not particularly esoteric, but JB Weld might be a good answer.

J-B Weld Twin Tube | J-B Weld

 

[52 Ford]

I'd just use super glue. Really. It doesn't have to be food grade, anyway. The plastic part doesn't touch the food (if it does, you're doing it wrong )

Here's some stuff you could try. Cheap, too!
Amazon.com: Loctite 681925 Super Glue Plastics Bonding System, Single, Multi : Industrial & Scientific

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[Dr. Rob]

JB Weld is a very good answer, esoteric or not. The regular, standard, original version can happily withstand 400F. I know it does; I have tried it. Can't speak to the other new, improved (?) varieties of JB though.

 

[52 Ford]

I just grabbed the instapot and took a look.

In conjunction with the adhesive, I wonder if you could get a longer screw. One that'd run all the way through it to help pull it back together. For what it's worth, I don't think the plastic lugs are under a lot of stress. Most of the pressure is put on the inner stainless steel lid.

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[TDegenhart]

I'd just use super glue. Really. It doesn't have to be food grade, anyway. The plastic part doesn't touch the food (if it does, you're doing it wrong )

Here's some stuff you could try. Cheap, too!
Amazon.com: Loctite 681925 Super Glue Plastics Bonding System, Single, Multi : Industrial & Scientific

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Careful! Cyanoacrylates do not play well with water.

Tom

 

[DDoug]

PC-Fahrenheit™ – Protective Coating Company

Made just North of you....

 

[WizardOfBoz]

I just grabbed the instapot and took a look.

In conjunction with the adhesive, I wonder if you could get a longer screw. One that'd run all the way through it to help pull it back together. For what it's worth, I don't think the plastic lugs are under a lot of stress. Most of the pressure is put on the inner stainless steel lid.

Yeah, this is a good idea. The screw in your pic is only about 3/4 inch long. Thx!

 

[WizardOfBoz]

PC-Fahrenheit™ – Protective Coating Company

Made just North of you....

Unfortunately not... Manufactured by Songhan Plastics Technology in Shanghai, sold by Protective Coating Company. But it does look interesting....

Not sure that I'd seal a steam pipe with it, as they apparently show in their videos!

Thanks.

 

[DDoug]

Unfortunately not... Manufactured by Songhan Plastics Technology in Shanghai, sold by Protective Coating Company. But it does look interesting....

Not sure that I'd seal a steam pipe with it, as they apparently show in their videos!

Thanks.

Huh, and they are so proud that they are "American Made"...must only be certain epoxies in their catalog....
FAQ – Protective Coating Company

 

[true temper]

My wife’s plastic handle broke off her crock pot, same type of plastic as what you are dealing with.
It set on the bench for a month, trying to figure out the best way to fix it,
Figured it out threw the sob in the trash and told her to go buy a new one

 

[DDoug]

My wife’s plastic handle broke off her crock pot, same type of plastic as what you are dealing with.
It set on the bench for a month, trying to figure out the best way to fix it,
Figured it out threw the sob in the trash and told her to go buy a new one

Why would you purchase the same model ? The handle is still gonna fall off....