M00016882
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ISO FDIS 15901-1 2015 Edition, November 3, 2015 EVALUATION OF PORE SIZE DISTRIBUTION AND POROSITY OF SOLID MATERIALS BY MERCURY POROSIMETRY AND GAS ADSORPTION - PART 1: MERCURY POROSIMETRY
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Availability date: 07/14/2021
Description / Abstract:
This International Standard describes a method for the
evaluation of the pore size distribution and the specific surface
area of pores in solids by mercury porosimetry according to the
method of Ritter and Drake[1][2]. It is a comparative test, usually
destructive due to mercury contamination, in which the volume of
mercury penetrating a pore or void is determined as a function of
an applied hydrostatic pressure, which can be related to a pore
diameter.
Practical considerations presently limit the maximum applied
absolute pressure to about 400 MPa (60 000 psi) corresponding to a
minimum equivalent pore diameter of approximately 4 nm. The maximum
diameter is limited for samples having a significant depth due to
the difference in hydrostatic head of mercury from the top to the
bottom of the sample. For the most purposes, this limit can be
regarded as 400 μm. The measurements cover inter-particle and
intra-particle porosity. In general, without additional information
from other methods it is difficult to distinguish between these
porosities where they co-exist. The method is suitable for the
study of most porous materials non-wettable by mercury. Samples
that amalgamate with mercury, such as certain metals, e.g. gold,
aluminium, copper, nickel and silver, can be unsuitable for with
this technique or can require a preliminary passivation. Under the
applied pressure some materials are deformed, compacted or
destroyed, whereby open pores may be collapsed and closed pores
opened. In some cases it may be possible to apply sample
compressibility corrections and useful comparative data may still
be obtainable. For these reasons, the mercury porosimetry technique
is considered to be comparative.