Performance Data
Standard technical data—including water absorption, acid resistance, and modulus
of rupture—are available for our stones. In general, the brownstones that we
have selected are exceptionally strong, with high compressive strengths. Typical
compressive strengths are from 12,000 to 18,000 psi, with 48 hr water absorption
ranging from 2 to 5%.
However, individual measurements such as strength are not necessarily the best
parameters for the prediction of the weathering characteristics of a building stone,
and thus its longevity. Samples of all of the brownstones we represent have
successfully gone though 100 freeze-thaw cycles. While this is an extreme test, it
is useful as a comparison to other well-known stones, such as Indiana limestone,
which typically fails this freeze-thaw test at 60-65 cycles, yet we know has been
successfully used in the northern United States for well over 100 years.
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