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Stereopycnometer™

Applicable Standards: ASTM D2638, D5550, D4892, D6093, D5965, D6226, B923; MPIF Standard 63

The Stereopycnometer is a manually operated instrument designed to measure the true volume of powders and other solid materials by employing Archimedes’ principle of fluid (gas) displacement and the technique of gas expansion. From this volume, density is easily determined by dividing into the weight of the sample. It features a digital display and fine adjustment controls for both pressurization and venting rates. A complete density analysis can be done in as little as a minute.

Gas is used as the displacing fluid since it penetrates the finest pores assuring maximum accuracy. For this reason helium is recommended, since its small atomic dimension enables entry into crevices and pores approaching two Angstrom (10-10m). Its behavior as an ideal gas is also desirable. Other gases such as nitrogen can be used, often with no measurable difference.

 Stereopycnometer™

The Stereopycnometer comes with a choice of two inter-changeable sample cells used in conjunction with a single reference volume. A sample is placed in the sample cell and degassed by purging with a flow of dry gas, by vacuum, or by a series of pressurization cycles. The standard analysis is performed by pressurizing the sample cell to approximately 17 psi and recording the value. The selector valve is rotated so the gas expands into the reference or added volume and that lower pressure is recorded. From these two readings, the sample volume can be quickly and accurately calculated.

Manually Operated Gas Pycnometers
Gas Recommendations: Ultrahigh purity compressed gas with outlet pressure of 20 PSIG. Helium is standard. Nitrogen or SF6 are alternate gases for helium permeable materials.
Precision: Digital pressure display resolution of 0.001 pounds per square (psi)
Accuracy: Better than 0.2% (when properly prepared, thermally equilibrated, and sample occupies greater than 75% of nominal sample cell volume).
Calibration: Metal spheres (provided) by cell size: 4.5 cm3 Cell: 2 spheres, 1.0725 cm3 each 135 cm3 Cell: 1 sphere, 56.5592 cm3
Options: • N.I.S.T. certification of a sphere diameter
• Non-elutriating cells for fine powders
• Stainless steel cells for durability
• Fiber/film winding spool. Fits 20 cm3 cell.
Physical: Weight 24 lbs. (10.9 kg)
Width 11.8” (30 cm)
Depth 18.5” (47 cm)
Height 7.1” (18 cm)
Power: 100/240 V; 50/60 Hz

Gas Regulator Assembly
Gas Regulator Assembly


Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
WG-812303 Stereopycnometer, 110/230V 50/60 Hz $5,580.00
WG-812324 Gas regulator assembly 545.00
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