ISO 8841:1991 Preview
Dense, shaped refractory products -- Determination of permeability to gases
This standard was last reviewed and confirmed* in 2017.
*Therefore this version remains current
The method specified takes account of the dynamic viscosity of the gas, and therefore the results obtained may not be directly comparable with those obtained by earlier methods. Describes the principle, the apparatus, the test pieces and procedure, the expression of results, and the contents of the test report.