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Cornerman
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06-24-2019, 12:03 PM

Quote:
Originally Posted by rhinobywilhite View Post
Anyone have a generic name for Juma? I know it is a thermoplastic but not sure if it is polyethylene or another plastic.
I have to believe that Juma is a thermoset, not a thermoplastic.


Freddie <~~~ plastically speaking


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06-24-2019, 01:50 PM

I believe they indicate on the website that it is thermoplastic and can be deformed after submersing in boiling water.


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06-24-2019, 04:02 PM

Well, I double checked and Atlas calls it both:
“The Juma material is a colored thermoset plastic. It machines easily with a small chip, and polishes up to a fine luster, and will not mushroom. Juma glues well with Epoxy, and holds a finish as well.

Juma is also Thermoformable. Submerge in boiling water and it can be formed and bent.”

which seems contradictory in its nature. I have used the boiling water trick so I KNOW it is formable. By definition if something is thermoset, it would seem that it would be stable under subsequent heating, wouldn’t it?



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06-24-2019, 04:15 PM

What I do know is that Atlas has been out of the thin white Juma for some time. I was told it would arrive in the next 2-3 weeks.
  
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06-24-2019, 06:36 PM

Quote:
Originally Posted by Scratchy View Post
Well, I double checked and Atlas calls it both:
“The Juma material is a colored thermoset plastic. It machines easily with a small chip, and polishes up to a fine luster, and will not mushroom. Juma glues well with Epoxy, and holds a finish as well.

Juma is also Thermoformable. Submerge in boiling water and it can be formed and bent.”

which seems contradictory in its nature. I have used the boiling water trick so I KNOW it is formable. By definition if something is thermoset, it would seem that it would be stable under subsequent heating, wouldn’t it?



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It’s not contradictory, but I can see why you might think it is. It’s a thermoset, and Atlas doesn’t called it anything else. I don’t know enough about this particular Juma, but thermosets like certain silicones can be thermoform-able (to a point). In other words, thermoforming isn’t exactly an opposite to all thermosets. In times like this, I lean on my materials experts that I work with to tell my how boiling water could possible reform a thermoset. Some newer thermoset can be reformed or at least broken down under some kind of strong acid.

We shall see. It reads like this is a rigid, high strength Polyurethane thermoset mixed with some magic.

Freddie


--------

Name: Freddie Agnir
Shooting Cue: 2017 Tascarella (w/blokid extension) or Schuler SC-250
Breaking Cue: BK Rush

Playing time: just a hair above zero
--------

"I don't care if you win, just cover the spread!"

- Annie Potts (Memaw from Young Sheldon)

Last edited by Cornerman; 06-24-2019 at 07:40 PM.
  
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