Ultrafoam and Pentafoam
Product Category: Density Measurement
UltraFoam™1200e & PentaFoam 5200e:
Automatic Gas Pycnometers
For the Characterization of Foams
The cell type of porous materials correlates with performance attributes such as strength, fluid exclusion (or acceptance) and insulating properties. Closed cells impart water resistance, thermal insulation, buoyancy and resilience. Open cells determine properties related to filtration, acoustics and wicking.
The standard technique used by the Foam pycnometers is that of gas expansion from a calibrated sample chamber into a reference volume. The solid and closed cell volume of the sample is calculated from the relationship of the calibrated cell volumes and the pressures before and after expansion. The closed cell percentage is calculated from the solid volume and the measured geometric volume of a rectangular or cylindrical sample. Open cell % is calculated by difference (100%-open cell % = closed cell %). Density is calculated from mass (weight)/volume and is reported as grams/cc.
The UltraFoam 1200e and PentaFoam 5200e pynometers conform to ASTM D6226 "Standard Test Method for Open Cell Content of Rigid Cellular Plastics."
Correction for Cut Cells
In ASTM D6226, a corrected percentage of open cells is estimated by remeasuring the volume of a cube after sectioning into eight parts. The UltraFoam and PentaFoam pycnometer programming provides a convenient way to automate this calculation. The report gives both the (uncorrected) Open Cell% and the Corrected Open Cell% values.
These pycnometers offer a special feature that extends the range of usefulness for less rigid foams. By automatically increasing the measuring pressure stepwise, the resulting series of Compression% data provides a rational basis to determine:
(1) compression profile characteristics for quality control
(2) If there is an optimum pressure for the most accurate Open Cell% and Close Cell% readings.
In a similar way, the Foam pycnometers have an important analytical ability for rigid foams that have fragile cell walls. In this mode, each step of increasing pressure is tested to see if the pressure change caused a permanent decrease in Closed Cell%. The data series of Fracture% versus pressure thus presented provides a rational basis to determine:
(1) cell fracture profile characteristics for quality control
(2) If there is an optimum pressure for best accuracy.
Specifications are based on clean, dry, thermally equilibrated samples and filled sample cells.
|Large, 135 cc:||better than ± 0.02%||better than ± 0.01%|
|Medium, 50 cc:||better than ± 0.03%||better than ± 0.015%|
|Small, 10 cc:||better than ± 0.03%||better than ± 0.015%|
|SAMPLE SIZE:||0.1 to 135 cm3|
|GAS:||High purity nitrogen, SF6, helium or other non-corrosive gas|
|PRESSURE:||Programmable from 2 to 18 psig, fixed or stepwise|
|PURGE MODES:||Flow (adjustable time) pulse (programmable by number), or evacuations.( evacuation available on Ultrafoam only.)|
|CONNECTIVITY:||USB printer port, Ethernet (to PC or network) RS232 to electronic balance. PycWeb html interface included.|
|MEMORY:||Long term retention of calibrations, run parameters and last run data. Reports can be saved to USB flash / thumb drive.|
|POWER:||100 - 240 VAC, 50/60 Hz|
|WEIGHT:||21.5 lbs. / 9.75 kg|
|DIMENSIONS:||Width: 31.1 cm (12.25")
Depth: 54.0 cm (21.25")
|Height: 22.7 cm (8.9")|