temp. rating of used fire brick? (rocket mass heater
You got firebrick, Baby! Even a low rating of 1800-2000 degrees will do whatever you need. The light tan color suggests an elevated silica content. This is good The dark flecks result from the alumina. Can't tell much from the weight. Depends on what the proportions of material is used. For less than a buck each, that's a touchdown!
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