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ASTM D 6226 Document Information:
Title
Standard Test Method for Open Cell Content of Rigid Cellular Plastics
ASTM International
Publication Date:
Apr 1, 2005
Scope:
(Footnote *)
This test method covers cellular plastics, which are composed of
membranes or walls of polymer
separating small cavities or cells. These cells may be interconnecting
(open cell), non-connecting
(closed cell), or any combination of these types. This test method
determines numerical values for
open cells. It is a porosity determination, measuring the accessible
cellular volume of a material.
The remaining volume is that occupied by closed cells and cell walls.
Since any conveniently sized
specimen can only be obtained by some cutting operation, a fraction of
the closed cells will be
opened by specimen preparation and will be included as open cells,
(see Note 2).
This test method provides good accuracy on predominantly highly
open-celled materials. By not
accounting for closed cells that were opened during specimen
preparation, the accuracy decreases as
the closed cell content increases and as the cell size increases.
The values as stated in SI units are to be regarded as the standard.
The values in brackets are
given for reference only.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1 - This test method and ISO 4590-1981 use the same basic
principles but are significantly
different in experimental detail.
NOTE 2 - Two procedures for correcting for cells opened during
specimen preparation are described
in Appendix X1.1.
Footnote * - A Summary of Changes section appears at the end of this
standard.
Keywords:
- cell wall
- cellular plastics
- closed cell
- open cell
- pycnometer
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