Login    Register
User Information
We are a free and open
community, all are welcome.
Click here to Register
Who is online

In total there are 45 users online :: 2 registered, 0 hidden and 43 guests

Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot] based on users active over the past 5 minutes

The Team
Global Moderators
global_moderators.png CS

Shear strength of epoxy putty

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
  • Author

Unread postAuthor: theBOOM » Tue Jul 06, 2010 1:44 am

I find that heating the epoxy before mixing it in the correct ratios will give me a more "liquid-like" epoxy, which makes mixing and pouring a bit simpler. To make the final product stronger and ensure proper curing you should heat the cast for about 2 hours at about 250*F.

JSR do you use medical syringes to mix your epoxy? I bought about 8 of them and I seem to be running out already...
  • 0

User avatar
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Jul 06, 2010 2:50 am

theBOOM wrote:JSR do you use medical syringes to mix your epoxy? I bought about 8 of them and I seem to be running out already...

I run the laboratory I work in so I have a practically endless "free" supply ;)

What I do many times though is take say a 10mL syringe, remove the plunger, plug the nozzle with a screw and use it a small measuring cylinder.
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
Donating Member
Donating Member
Posts: 25032
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 129

Unread postAuthor: btrettel » Tue Jul 06, 2010 10:47 pm

Thanks for all the help.

I suppose I'll heat the epoxy to reduce the viscosity.

My main worry is residual stress from the cooling. As a material cools, it contracts a bit. This will make the epoxy be in a state of tension when the chamber is unpressurized. Devcon was smart enough to provide the coefficient of thermal expansion though, so I should be able to figure out how much stress is created and factor it into my calculations. :)
  • 0

All spud gun related projects are currently on hold.

Posts: 380
Joined: Sun Feb 03, 2008 4:40 pm
Location: Maryland
Reputation: 0


Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot]

Reputation System ©'