With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
Indestructible Thumb Detecting Shop Stein
Fireproof Carbon Foam from Pyrolysed Bread
Peach Jar Rock Tumbler
Machinist's Gold Plated Oil Can
Easy Permanent Print on Metal - Pro results at Home!
Magnetic Runny Silly Putty (the REAL stuff)
Kinetic sand + stick welder = Easiest Aluminum Casting EVER!
The no-clamp metal cutting saw guide!
100 ton steel press without hydraulics for bending, crushing, punching and forming
Makes sense! - hugbear
I may be wrong about this so anyone else correct me if I am, but the carbon foam will eventually burn away, it is simply and effect of the insulating properties that only allow the tiniest portion of the surface of the material to get hot enough to actually combine with oxygen. From what I understand this is like aerogel, being made of glass foam you'd think it would melt instantly under heat from a torch but there are several demos of aerogel insulating things like crayons and flowers from a direct blast from a torch without any visible affect on the aerogel, simply because such a small part of the surface was affected by the torch. Heat it long enough and the bread will burn and the glass will melt, it's just really slow. - LazyH
You don't even need to purge the oxygen, it will usually burn away before it starts affecting the carbon, but that's if you have a mostly sealed container with a small vent for gasses to escape. I used to make small chunks of charcoal and charwool from fabric and branches just wrapped in aluminum foil and tossed in a campfire. It's impossible for the foil to completely seal what's inside and what little oxygen there is will get either pushed out with the browns gasses or will burn with the browns gas and become inert to the carbon that remains. I use to take a 20 gallon steel drum and will it with wood from out at the farm and do the same thing, the lid wouldn't completely seal it so I had a working vent, but it kept the oxygen out long enough to completely pyrolize the whole thing, adding argon just adds a bit extra insurance to make sure it all goes right. - LazyH
from what I understand both can have an equally clean burn, but because hydrocarbons are typically fluid in nature (gas like propane or liquid like octane) they will be able to burn more efficiently (more completely) due to better mixing with the oxygen in the air and reducing the chances of co and soot/ash. Of course there is almost never any PURE hydrocarbons or carbon to burn, hence why you have ash left after a charcoal burn, and it also depends on the environment of the burn too (insulating container, oxygen rich or lean atmosphere, high air currents, etc.). I've never had any residue of any kind left after a propane burn for my forge or metal casting, but charcoal will always leave some kind of ash or residue, especially if its not homemade like ours is. - LazyH
NIce work :)You had soldered the box. ¿Do you have tryed to press a flat cover against the box with a screw press? In this way you will not need the treaded hole.
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.