They last for years with out cracking and cost the equivalent of R10 for an entire combustion chamber. In Central America, Aprovecho has been using these for 3 years and have had very few problems. Option 1: Ceramic tiles Kiln-fired ceramic tiles form a Rocket elbow combustion chamber that is inexpensive and extremely durable. Listed below are some of the other combustion chamber possibilities. During the workshop we constructed combustion chambers, or Rocket Elbows, from 3mm mild steel and 1.4mm stainless steel. Be sure to follow the directions for the appropriate size of combustion chamber. The type of combustion chamber will change the dimensions of the rocket body and the size of the shelf. ROCKET STOVE DESIGN GUIDE The first step is to decide which kind of combustion chamber you want to put in your rocket stove. It will take some trial and error to get the right mix but it is well worth the effort. If they make ceramic pots for cooking, ask them to use a similar mixture for your tiles. Ask them to use a mixture that can withstand high temperatures after firing. If you are interested in pursuing this option I recommend contacting a traditional artisan who makes brick or ceramic wares and ask them to make you 5 bricks that are 25 by 250 by 250mm each. The ceramic tiles have a higher mass than the 3CR12 but their low conductivity aid in maintaining high combustion chamber temperatures. They are made with common clay, and once fired, take only seconds to assemble and install.
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