Micromeritics Accupyc II Pycnometry System

Micromeritics Accupyc II gas displacement pycnometry system is a non-destructive technique for the reliable measurement of true, absolute, skeletal, and apparent volume and density.

Micromeritics Accupyc II Pycnometry System

Micromeritics Accupyc II gas displacement pycnometry system is a non-destructive technique for the reliable measurement of true, absolute, skeletal, and apparent volume and density.

Manufacturer Micromeritics
Product Series Micromeritics Accupyc
Measurement principle Gas Displacement Pycnometry
Application Density, pore size and volume
TemperatureRecommended range: 15 to 50 °C
Humidity20 to 80% relative, non-condensing
PrecisionReproducibility within ± 0.01%
AccurateWithin 0.03% of reading, plus 0.03% of sample capacity

Product Overview

Micromeritics AccuPyc II series automatic pycnometers provide high-speed, high-precision volume measurements and true density calculations on a wide variety of powders, solids, and slurries.

AccuPyc II is very easy to use and can be operated with a keypad or an optional Windows® interface. It completes most sample analyses accurately within three minutes and consists of an integrated control and analysis module. For those who require high throughput, an integrated control and analysis module can control up to five additional external analysis modules of the same or different volume capacities. Optional FoamPyc software enables density measurements for open- and closed-cell foam materials. The weighing solution bundle provides one-touch transfer of mass data from the analytical balance directly to the AccuPyc’s Windows software. Direct transfer eliminates user error associated with manual entry of mass data. Optional Peltier temperature control eliminates environmental temperature variation and facilitates the handling of “hot” samples.

Principle of Operation

AccuPyc uses the non-destructive technique of gas displacement to measure volume accurately. Inert gases, such as helium or nitrogen, are used as the displacement medium. The sample is sealed in the instrument compartment of known volume,the appropriate inert gas is admitted, and then expanded into another precision internal volume. The pressures observed upon filling the sample chamber and then discharging it into a second empty chamber allow computation of the sample solid phase volume. Helium molecules rapidly fill pores as small as one angstrom in diameter; only the solid phase of the sample displaces the gas. Dividing this volume into the sample weight gives the gas displacement density.



  •  Non-destructive test maintains product integrity
  • Instrument configuration can be adapted to meet sample size needs
  • Superior speed of analysis, accuracy, repeatability, and reproducibility
  • Eliminates error with programmable automatic repeat and data acquisition set to tolerances to comply with SOPs
  • Minimises cost and space requirements – low maintenance and small footprint
  • Operates with either a keypad or Windows® software
  • Uses a variety of gases
  • Increases efficiency and compliance with bar-coding compatibility
  • Eliminates procedural steps with direct input from an analytical balance


Powder Metallurgy

Results of many intermediate and final processing steps are controlled by or
related to skeletal density of the metal. In addition, the performance of many
sintered or cast metal structures may be predicted from the skeletal density of
the starting metal powder.

Refractory Materials (ASTM C604-02)

True density is a useful value for: classification, detecting differences in chemical
composition between supposedly similar samples, indicating
mineralogical phases or phase changes, calculating total porosity when the
bulk density is known, and for any other test method that requires this value
for the calculation of results.

Calcined Petroleum Coke (ASTM D2638-10)

The density of calcined petroleum coke directly influences the physical and
chemical properties of the manufactured carbon and graphite artifacts for
which it is used. Density, therefore, is a major quality specification of calcined
petroleum coke and is used as a control in coke calcination.

Soil (ASTM D5550-06)

The specific gravity of soils that contain extraneous matter (such as cement,
lime, etc.) or water-soluble material (such as salt) must be corrected because
of the precipitate that forms on the specimen after drying. If the precipitate
has a specific gravity less than the parent soil grains, the uncorrected test
result will be too low. If the precipitate has a higher specific gravity, then the
uncorrected test value will be too high.

Powder coatings (ASTM D5965-20)

Total solids content can be used to determine minimum coverage obtainable
with different coating blends. Mixtures of dry pigments can be monitored by
comparing measured density with theoretical density based upon composition
of the mixture.

Clear or Pigmented Coatings (ASTM D6093-97)

Dried film density can be used in the determination of Volatile Organic
Compound (VOC) content of clear and pigmented coatings. VOC is required
by government regulations.

Rigid Cellular Plastics (ASTM D6226-10)

Plastic foams exhibit different properties based upon the ratio of open and
closed cells. Insulation foams limit thermal conductivity through pockets of
trapped gases contained within closed pores. Flotation devices owe buoyancy
to closed air-filled pores that prohibit water entry.

Pharmaceuticals (USP 699)

Composition of active and excipient ingredients can be monitored and
controlled through determination of product density. Polymorphic, hydrated,
and amorphous forms of products, as well as purity, can be determined by
comparing measured density with theoretical and historical values.

Product Enquiry


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