I came across this recipe for castable perlite insulation and thought about giving it a try to insulate a heat riser made from stove pipe with in hopes that once the thin stove pipe burns up the cast refectory will be strong enough and last for many many years. I have my doubts that this mixture would be strong enough but maybe insulated fire bricks could be made for the burn tunnel as well. www.myheap.com/book/chapter-01/irc/irc.php
There are a lot of different recipes that i have found some contain calcium aluminate cement, I'm hoping to find a way to make insulating fire brick from clay i can find in the ground and sawdust. Some of the test bricks that i have made from clay and saw dust have good insulating properties but are quite fragile I'm making a rocket heater with a out of sawdust and dirt with a consumable liner, my hope is that the saw dust will burn out of the first inch or two which will provide enough insulation to prevent the rest of the sawdust from burning out so that there is still good strength to the outside of the stove. I'll post some pictures and stuff i don't think that the heater will be ready for at least a month tho because of how long it takes the sawdust and dirt to dry.
Last Edit: Mar 25, 2010 20:02:50 GMT -8 by spacevan
Right on spacevan! Donkey has done quite a bit of experimenting with this too. Have you seen his older threads on the subject? I seem to remember one called "tapered heat riser"? but check back through the threads and you'll find a bit of info he's shared.
I found an article describing the results of different home made fire brick using clay as a binder. The amounts used, there effectiveness of insulating and also the effect they have on the temperature of the fire are charted out. I found the article to be interesting and a good starting point for trying to come up with ways to make a durable rocket heater with out the use of fire brick. Where i am from fire brick is almost impossible to find except the 1.25"x4"x9" fire brick for lining wood burning stoves. Canadian tire charges $6.00 a brick so that is way to expensive the make a rocket heater core out of. The link for the article is www.hedon.info/InsulativeCeramicsForImprovedCookingStoves
Last Edit: Mar 30, 2010 14:54:15 GMT -8 by spacevan
ericvw: Got that right, sista Daryl!
Apr 10, 2015 16:57:57 GMT -8
Daryl: I'm off on a hike...everyone have a good day!
Apr 12, 2015 7:40:50 GMT -8
ericvw: So Daryl, to where did you hike?
Apr 13, 2015 14:21:38 GMT -8
Daryl: Along the French Creek. Ok, it was more of a walk...but still! I got outside!!! And it was in the 60s, cool, and breezy! If it doesn't rain tomorrow, then I am going to try to get over to a lake. Just smelling the fishy water will be a buzz!
Apr 13, 2015 15:38:28 GMT -8
ericvw: Everyone in the states doing there taxes or something? Perhaps Spring has sprung... Boards are quiet!
Apr 15, 2015 16:18:19 GMT -8
Daryl: Warm and the sun is out = quiet boards.
Apr 16, 2015 5:08:56 GMT -8
ericvw: We've been in the rain for DAYS! And not warm rain, either
Apr 16, 2015 14:57:18 GMT -8
Daryl: You are two states south of me! You're supposed to be warm! Stop it!
Apr 16, 2015 16:14:09 GMT -8
ericvw: Talk to the hand, Daryl! You can handle being two states above me, this I know! Did you catch that buzz off the fishy creek, or is that what u youngsters call it these days?(rofl)
Apr 17, 2015 17:44:41 GMT -8
Daryl: Ooooo snap, Eric. Nah, I get high on nature...and ice cream.
Apr 17, 2015 18:16:53 GMT -8