AzB Silver Member
Anyone have a generic name for Juma? I know it is a thermoplastic but not sure if it is polyethylene or another plastic.
Unlike many plastics we use in cue making that are borrowed from other industries & given a new name, I believe Juma is uniquely its own. Only one manufacturer and they only call it Juma.
That my very well be what the manufacturer calls it, but it would likely still be identifiable by it's actual composition. That information however is likely proprietary. My apologies for the intrusion.
The mix ratio is proprietary.
Darryn Hill claimed he told them to add more epoxy after he was sent some samples.
In the plastics world, the cue industry is just a dot in the universe.
It's a miracle Juma or T-34 are even being made.
But Juma is also now a popular knife handle material.
Agreed. When I was searching for the material for Project Tomahawk, it was a miracle that I found one particular company that was initially willing to deal with me. I was just a tiny niche blip in their world. When I turned the material over to Kelly Peterson, I was thrilled they agreed to continue supplying to him.
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.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?
Sent from my iPhone using Tapatalk