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brick identity

updated thu 16 dec 99

 

gambaru on wed 15 dec 99

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I have a number of dense heavy bricks which have on the surface stamped: =
ACIDO
and 72-81. I believe they are an arch brick. Make an almost perfect circle=
8
feet in diameter. I have been using them in the garden for at least ten =
years.
They have gone through much feezing and thawing with no spalling. Have used=
for
a fire pit with no problems. I would like to consider their usuage in a =
kiln
but not sure if they are high temp. Anyone know ? Thanks a bunch. Marj.
=22only 10 days until I can lock the doors..ho ho ho hooray=21 =22