GB/T 21650.1-2008
Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption.Part 1: Mercury porosimetry (English Version)

Standard No.

GB/T 21650.1-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 21650.1-2008

Scope

CAUTION: Use of this section may involve toxic substances, procedures, and instruments. This section does not address all security issues in use. Before using this section, it is the user's responsibility to establish appropriate safety and health awareness and formulate practical rules and regulations. This section describes the compression method developed by Ritter and Drake ^{[1] [2]} to evaluate the pore size distribution of solids and the specific surface area in the pores. It is a comparable method. This method is usually destructive due to mercury contamination. The volume of mercury penetrating into pores or voids is measured as a function of the static pressure associated with the pore size. The maximum external pressure limited in actual operation is about 400MPa (60000 psia), which corresponds to the smallest pore diameter that can be measured is about 0.003μm. The maximum pore diameter that can be measured is mainly affected by the depth of the sample, because there is a difference in the static pressure from the top to the bottom of the sample. Generally, the maximum pore diameter that can be measured is 400 μm. The measurements cover both intra- and inter-particle porosity, and in general the method cannot differentiate between these two types of porosity. This section applies to the study of most non-wetting porous materials. This part is not suitable for amalgamation materials, such as some metals such as gold, aluminum, reduced copper, reduced nickel and silver. If this method must be used, the sample needs to be pre-passivated. Under external pressure, some materials will be deformed, squeezed or destroyed, and the open pores will collapse and the closed pores will open. In some cases, it may be necessary to introduce a sample compressibility correction factor to obtain useful comparable data. Therefore, mercury porosimetry is comparable.

GB/T 21650.1-2008 Referenced Document

• GB/T 3723 Sampling of chemical products for industrial use--Safety in sampling
• ISO 8213 Chemical products for industrial use; Sampling techniques; Solid chemical products in the form of particles varying from powders to coarse lumps

GB/T 21650.1-2008 history

• 2008 GB/T 21650.1-2008 Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption.Part 1: Mercury porosimetry

GB/T 21650.1-2008 -All Parts