• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Nicole Alderman
  • r ranson
  • Pearl Sutton
  • Mike Haasl
  • paul wheaton
stewards:
  • Joylynn Hardesty
  • Dave Burton
  • Joseph Lofthouse
master gardeners:
  • jordan barton
  • Greg Martin
gardeners:
  • Carla Burke
  • Ash Jackson
  • Kate Downham

Rocket Stove Perhaps

 
Posts: 155
Location: Cornwall UK
7
dog forest garden tiny house books bike solar
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Found these dumped in our yard at work. I think they were from night storage heaters.

Would they stand up to the heat of a rocket stove?




Thanks

Paul
 
gardener
Posts: 2003
Location: Grand Valley of Colorado's Western Slope
172
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
They look like concrete, are they? If so, they could be mass at some point down the line, but probably not the fire box or riser, where the temperatures get so high. One concrete material advertised as heat resistant can be exposed to intermittent temperatures up to 1000F, and constant heat of 300F. Rocket stoves have sustained temperatures much higher than 300F.

One of the problems with concrete is the temperature differential in between one part of the chunk of concrete and another.

Thekla
 
gardener
Posts: 3268
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
163
 
Thekla McDaniels
gardener
Posts: 2003
Location: Grand Valley of Colorado's Western Slope
172
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Interesting link. I wonder how to tell if they are magnesium.
 
Satamax Antone
gardener
Posts: 3268
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
163
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
throw one in a fire. If it's concrete, it will crack!
 
Thekla McDaniels
gardener
Posts: 2003
Location: Grand Valley of Colorado's Western Slope
172
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Oh, gosh Satamax. That was easy! Put it into someone's rocket stove, or a potter's kiln, or a forge for the high temp test!
 
gardener
Posts: 717
Location: +52° 1' 47.40", +4° 22' 57.80"
115
woodworking rocket stoves wood heat
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Those magnesium bricks are deep purple colored and much more heavy than you would expect. The surface is very smooth and the color is very uniform. When it isn't this way, it must be something else.
 
gardener
Posts: 3133
Location: Upstate NY, zone 5
157
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Those look a lot like a couple I have from my mother's lake cottage storage heaters. They have iron slag (perhaps that is magnetite), are very heavy and impervious to weather - they have been in upstate New York weather for 10-15 years. I wish I had a pile of them.
gift
 
100th Issue of Permaculture Magazine
will be released to subscribers in: soon!
reply
    Bookmark Topic Watch Topic
  • New Topic