ASTM 2178 and 2357 Explained
ASTM 2178 and 2357 Explained
ASTM 2178 and 2357 Explained
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<strong>ASTM</strong> E<strong>2178</strong> Test ProcedureCalculation of Air Permeance:• At each pressure station, the flow ratethrough the specimen shall be determinedby subtracting the extraneous air flow ratefrom the total air leakage;• The flow rate equation of the formQ = C·A·(DP) n shall be established by fittingthe data (30 points) on a Log/Log graph;• Calculate the material permeance at thepressure differences measured. (l/s/m 2 )
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