GB/T 21650.1-2026 Active National standards

GB/T 21650.1-2026 Evaluation of pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption—Part 1:Mercury porosimetry

Publish Date: 2026-01-28 Implement Date: 2026-08-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 21650.1-2026

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Screening, sieve plates, and sieve nets

ICS Name: Granularity analysis and sieving

Publish Date: 2026-01-28

Implement Date: 2026-08-01

Pages: 24 pages

Scope

This document describes a method for evaluating the pore size distribution and specific surface area of solids using the Ritter-Drake mercury intrusion method, which is a comparative method. Mercury is polluting, and this method is usually destructive. The volume of mercury infiltrating pores or voids is functionally related to the applied static pressure, which can be correlated to pore size. In practice, the maximum external pressure limit is approximately 400 MPa (60,000 psi), which corresponds to a minimum equivalent pore size of about 4 nm. The maximum pore size that can be measured is mainly affected by the depth of the sample, as the static pressure of mercury varies from the top to the bottom of the sample. Generally, the maximum pore size that can be measured is 400 μm (for some samples, the maximum pore size measured under certain conditions can reach 900 μm or even higher). The mercury intrusion method measures the porosity both within and between particles. Typically, without additional information from other methods, it is difficult to distinguish between these two types of coexisting pores using the mercury intrusion method. This document is suitable for studying most non-wetting porous materials. However, it is not suitable for mercury-amalgamated materials, such as certain metals like gold, aluminum, copper, nickel, and silver. If this method must be used, pre-passivation treatment of the sample is required. Under external pressure, some materials may deform, be extruded, or be damaged, resulting in the collapse of open pores or the opening of closed pores. In some cases, it may be necessary to introduce a sample compression rate correction factor to obtain useful and comparable data. Therefore, the mercury intrusion method is comparable in nature.