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Can some please help me find some info on these fire bricks? I recently bought a house and had a nice stack of these bricks in the garage 
. They are 9"x4" 1/2x 2" 1/2 and marked MRC. I want to sell some but I need some info so I don't rip someone off or myself. I know they withstand a lot of heat I lined my maple syrup evaporator with them and no cracks at all and it runs Hot. So if someone could help I would appreciate the help thank you.
. They are 9"x4" 1/2x 2" 1/2 and marked MRC. I want to sell some but I need some info so I don't rip someone off or myself. I know they withstand a lot of heat I lined my maple syrup evaporator with them and no cracks at all and it runs Hot. So if someone could help I would appreciate the help thank you.