Geopyc Model 1360 - Automatic Envelope (Bulk) Density Analyzer

The GeoPyc 1360 Envelope Density Analyzer rapidly measures the envelope density of porous objects of irregular size and shape by using a unique displacement measurement technique. Envelope density is the mass of an object divided by its volume where the volume includes that of its pores and small cavities.

The GeoPyc ™ 1360 Envelope Density Analyzer is a revolutionary instrument for rapidly measuring the envelope density of porous objects of irregular size and shape. Particle Size should exceed 2 mm for best results. Envelope density, or bulk density as it is sometimes called, is the mass of an object divided by its volume where the volume includes that of its pore and small cavities. Envelope density information is useful in characterizing catalysts, structural foams, insulators, ceramics, powder metallurgy objects, and other manufactured goods.

The GeoPyc follows a unique displacement measurement technique that uses a quasi-fluid composed of small, rigid spheres having a high degree of flowability; we call this medium Dry Flo . The sample is placed in a bed of Dry Flo , and the Dry Flo is agitated and gently consolidated about the sample. The GeoPyc collects the displacement data, performs the calculations, and displays or prints the results. The unit also reports percentage porosity and specific pore volume when absolute density information (density excluding pore and small cavity volume obtained from a Micromeritics Accu-Pyc helium pycnometer) is entered.

The analyzer is operated from a full character-set keypad. Data acquisition and reporting are fully automated for convenient incorporation in LIMS or other data concentrating systems.

A variety of sample chambers is available to accommodate a wide range of sample sizes. After the analysis, a light shaking or dusting completely removes the Dry Flo so the samples can be reused or retested. The GeoPyc has multiple operating modes including full blank, computed blank, and reference solid calibration with variance, which allows you to optimize speed and accuracy for your individual needs. During analysis, indications of progress and preliminary results make it possible to track what is occurring. Sample-specific information can be entered and the report generated in English, German, Italian, or Spanish.


  • Highly accurate and reproducible results
  • Fast operation
  • Small table-top unit
  • Fully automated data acquisition and reporting
  • Uses non-hazardous microspheres
  • Non-destructive to samples
  • Multiple operation modes
  • Multiple sample chambers available
  • Multiple language capability

Accessory Literature

The GeoPyc 1360 measures envelope density using a non-toxic, non-destructive volume displacement technique. It can also measure a density comparable to what is usually termed as tap density.

The latter can be defined as the mass of a material that, upon packing in a precisely specified manner, fills a container to a specified volume, divided by the container volume. Traditional methods of determining tap density involve repeatedly lifting and dropping a container of sample to tap down the volume and pack the particles.

The T.A.P.™ (Transverse Axial Pressure) density option can be purchased for the GeoPyc 1360. With this option, the GeoPyc accomplishes essentially the same measurement as a tap density device. It rapidly measures the bulk volume and calculates the bulk density of granular and powdered samples under a wide range of compaction conditions. Tap density (as usually measured) is bulk density determined at one specific set of conditions.

The T.A.P. analysis method is essentially noiseless, rapid, and easy to perform. First, a determination of the volume of an empty sample chamber is made and the data stored in the GeoPyc for repeated use during subsequent sample analysis. Next, a weighed quantity of sample is placed in the sample chamber and a plunger is inserted partially into the chamber. The chamber/plunger assembly is mounted on the instrument. The desired consolidation force (force with which the sample is compressed in either force [Newtons] or pressure [Newtons/cm2]), sample weight, and other parameters are entered and analysis begins. The operator has complete control over the degree of packing achieved during analysis.

The plunger exerts the consolidation force in stages. The plunger retracts a short distance, the sample is agitated, and then the plunger moves forward again until the desired force is reached and a measurement of the sample volume is made. Then the plunger retracts slightly. This is called the consolidation cycle. The force required to move the plunger into the sample chamber is detected by a force transducer, which ensures that the plunger exerts a consistent force upon the sample.

After the consolidation cycles are completed, the instrument uses the stored data to calculate the results. The measurement that the GeoPyc delivers is precise, with accuracy and reproducibility typically better than ±1%. Correlation of the results from the GeoPyc with those obtained using the older tap density method can be obtained by determining the degree of packing the other method achieved.

The GeoPyc T.A.P. Density Option has the ability to obtain precise results comparable to traditional tap density measurements, and is ideal for obtaining the packing densities of powder and bulk materials