About The Accupyc - Micromeritics ACCUPYC III Operator's Manual

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BOUT THE
Gas pycnometry is recognized as one of the most reliable techniques for obtaining true, absolute,
skeletal, and apparent volume and density. This technique is non-destructive as it uses the gas
displacement method to measure volume. Inert gases, such as helium or nitrogen, are used as
the displacement medium. Density calculations using the gas displacement method are much
more accurate and reproducible than the traditional Archimedes water displacement method.
Helium is the most used gas for pycnometry due to its ideal behavior; however, there are times
where other gases can be substituted for helium. Helium has the ability to permeate into pores
that are closed from the surface and interacts with some organic materials and microporous
carbons. The solution is to use another gas such as nitrogen, argon, or air. Larger molecules such
as sulfur hexafluoride can be used to include the volume of very small pores in volume results.
Care should be taken to select a gas that does not interact with the sample material.
The AccuPyc III pycnometer is a fast, fully automatic pycnometer that provides high-speed, high-
precision volume measurements and true density calculations on a wide variety of powders,
solids, and slurries. After analyses are started with a few touches, data are collected, calculations
are performed, and results displayed. A minimal amount of operator attention is required.
AccuPyc III Operator Manual
135-42800-01 (Rev -) — Nov 2023
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1 About the AccuPyc III
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