Accupyc Model 1340 - Automatic Gas Pycnometer

The AccuPyc® II 1340 Series Pycnometers are fast, fully automatic analyzers that provide high-speed, high-precision volume measurements and density calculations on a wide variety of powders, solids, and slurries. Using a gas displacement technique to measure volume, the AccuPyc II 1340 completes most sample analyses in less than three minutes.

The instrument can be operated with a keypad or an optional Windows® interface that provides exceptional reporting and archiving capability.

Both versions include direct sample mass input from a balance and cycle-based displacement volume reporting. With the Windows interface, features such as time-based pressure equilibration reporting and additional calculations such as percent solids content and total pore volume are included.

For those who require high throughput, the AccuPyc II 1340 Pycnometer with an integrated analysis module can control up to five additional external analysis modules. Each module can have a different size sample chamber (1 cm3, 10 cm3, 100 cm3, 350 cm3) providing even more versatility.


  • Measures the absolute density of solids and slurries having volumes from 0.01 to 350 cm3
  • Completely automatic operation
  • Optional Windows interface provides exceptional reporting and archiving capability
  • Integrated analysis module can control up to five external analysis modules
  • Capable of measuring open- and closed-cell foam materials with Optional FoamPyc software
  • MultiVolume options allow analyses of a large variety of sample sizes
  • Temperature-control version allows analysis at user-selectable temperatures
  • Glove box model allows analysis in controlled environments

Accessory Literature

  • FoamPyc Technique Determines Open Cell Volume in Foamed Materials
  • Sample Cell Kit Expands Analysis Range of AccuPyc Density Analyzer
  • Density Determinations of Plastic Film Using the AccuPyc
  • Determining Open Cell Content of Rigid Cellular Plastics with the AccuPyc
  • Volume and Density Determinations for Particle Technologists – Article by Paul Webb

The FoamPyc option for the AccuPyc 1340 Density Analyzer lets you measure, calculate, and report the percentage of open cell volume in blocks of foamed or cellular plastic, glass, rubber, or metal.

These foamed materials have thin membranes or walls that separate internal cavities or cells. These cells can be open or interconnecting, closed or non-connecting, or a combination of open and closed. With the FoamPyc flashcard, you can determine the percentage of sample volume occupied by open cells, as well as closed cells.

A Focus on Accuracy

The FoamPyc program ensures accuracy by correcting for punctured cells caused by cutting the block of material to obtain a sample. The volume of the cells that were opened on the cut surfaces of the sample are computed and their volume deducted from the analysis results so as not to overstate the true open-cell volume of the original uncut material.

The program uses correction calculations that follow ASTM Standard D 6556. Procedure “A” factors in cell chord length for estimating cut cell volume. Procedure “B” performs a second analysis to correct for opened cells, except this time the same sample is subdivided (re-cut) to expose twice the total surface area as before. Then, the second run is subtracted from the first run using a correction calculation, V = 2(V + D) – (V +2D), where V is the true open-cell volume and D is the cut cell volume. Procedure “C” performs an AccuPyc analysis on the cut sample as is, which works well with samples that have mostly open cells.

Procedure “D” permits the volume change of soft, closed cell foams to be measured by applying progressively larger amounts of isotropic gas pressure and computing the volume occupied by the foam. Procedure “E” evaluates the possibility of fracturing, which may occur when closed cell foam made of brittle material (having large, thin-walled cells) is exposed to pressure. This method applies first a small, controlled amount of pressure, and then performs a volume measurement. Next, a larger amount of pressure is applied. The sample is then returned to the first pressure and volume measurement is repeated.

Micromeritics announces the availability of a FoamPyc Sample Preparation Kit, Part No. 133/33009/00, to enhance your assessment of open pores in plastic foams. ASTM Test Method D-6556 describes the technique for extracting a sample of foam of specific dimensions then recutting it to double the amount of exposed surface, thereby deriving a correction for the pores opened in the initial cutting. The kit contains a knife, extra blades and a guide structure for both the first cutting of sample to dimensions and the recutting.