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Description
defined in ASTM method D-6226-15) and the measurements of
the sample to determine the volume of the cut cells. This volume
is deducted from the total volume of the open cells measured by
the pycnometer.
n Correction by recutting sample. Corrects for the cut cells by
using two separate measurements. For the 2nd measurement,
the sample is recut to double the amount of cut surface. The
observed difference in cut open cell volume is applied as a
correction to the initial measured volume. This method offers the
distinct advantage that no assumptions are needed about the
relative amounts of open and closed cells.
n No correction. Does not correct for cut cells. It is used for
materials with predominantly open cells where good accuracy
can be achieved without correction. The accuracy level
deteriorates as the percentage of closed cells increases.
Enter the initial and final pressure, and the pressure increment.
n Compressibility test. The fill pressure is increased incre-
mentally over the sample with each repeat of the P1, P2 cycle
(where P1 is the initial pressure to which the sample is charged,
and P2 the final pressure after expansion). The apparent vari-
ation of the measured sample volume with the average pressure
is determined. This test is an approximate indication. It is not
intended to be an exact measure of the volume compressibility.
Enter the Low pressure and the Fracture pressure.
n Cell fracture test. A perfectly rigid foam is assumed. First, a P1,
P2 cycle is performed at the lower of two specified P1 pressures,
and the results stored. A second cycle is performed at a higher
specified value of P1, then a third cycle identical to the first cycle
is performed. The difference between the volume of the sample
on the first measurement and on the third measurement is repor-
ted as the volume of fractured cells. It is assumed that cells frac-
ture by exposure to the highest pressure (2nd cycle) so that when
the third measurement is made, the measured sample volume
has decreased from the first cycle by the amount of the closed
cell volume which was fractured.
Cycle fill pressure
[textbox]
Enter the fill pressure for the cycles. Typically, the default of 19.500
psig is appropriate for most samples.
Analysis Conditions for Pycnometry Analyzers (continued)
Analysis Conditions
AccuPyc II 1345 Operator Manual
134-42851-01 (Rev A) — Jan 2021
5 - 3
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