ISO 15901-1:2005 pdf download.Evaluation of pore size distribution and porosimetry of solid materials by mercury porosimetry and gas adsorption — Part 1: Mercury porosimetry.
6.1 Sample holder, having a uniform bore capillary tube through which the sample can be evacuated and through which mercury can enter.
The capillary tube is attached to a wider bore tube in which the test sample is located. If precise measurements are required the internal volume of the capillary tube should be between 20 % and 90 % of the expected pore and void volume of the sample. Since different materials exhibit a wide range of open porosities a number of sample holders with different diameter capillary tubes and sample volumes may be required. A special design of sample holder is often used with powdered samples to avoid loss of powder during evacuation.
6.2 Porosimeter, capable of carrying out the test as two sequential measurements, a low-pressure test up to at least 0,2 MPa (30 psia) and a high-pressure test up to the maximum operating pressure of the porosimeter (circa 400 MPa (60 000 psia)J.
The porosimeter may have several ports for high- and low-pressure operations, or the low-pressure test may be carried out on a separate unit.
Prior to any porosimetry measurement it is necessary to evacuate the sample using a vacuum pump. equipped with mercury retainer, to a residual pressure of 7 Pa or less and then to fill the sample holder with mercury to a given low pressure. A means of generating pressure is necessary to cause intrusion of mercury.
A means of detecting the change in the volume of mercury intruded to a resolution of 1 mm3 or less is desirable, This is usually done by measuring the change in capacitance between the mercury column in the capillary tube and a metal sleeve around the outside of the sample holder.
6.3 Mercury, of analytical quality, with a purity of at least ratio of 99.4 mass %.
The capillary tube is attached to a wider bore tube in which the test sample is located. If precise measurements are required the internal volume of the capillary tube should be between 20 % and 90 % of the expected pore and void volume of the sample. Since different materials exhibit a wide range of open porosities a number of sample holders with different diameter capillary tubes and sample volumes may be required. A special design of sample holder is often used with powdered samples to avoid loss of powder during evacuation.
6.2 Porosimeter, capable of carrying out the test as two sequential measurements, a low-pressure test up to at least 0,2 MPa (30 psia) and a high-pressure test up to the maximum operating pressure of the porosimeter (circa 400 MPa (60 000 psia)J.
The porosimeter may have several ports for high- and low-pressure operations, or the low-pressure test may be carried out on a separate unit.
Prior to any porosimetry measurement it is necessary to evacuate the sample using a vacuum pump. equipped with mercury retainer, to a residual pressure of 7 Pa or less and then to fill the sample holder with mercury to a given low pressure. A means of generating pressure is necessary to cause intrusion of mercury.
A means of detecting the change in the volume of mercury intruded to a resolution of 1 mm3 or less is desirable, This is usually done by measuring the change in capacitance between the mercury column in the capillary tube and a metal sleeve around the outside of the sample holder.
6.3 Mercury, of analytical quality, with a purity of at least ratio of 99.4 mass %.
