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 Density Determinations
True (skeletal) density is determined by automatic gas expansion pycnometer so there are no solubility issues as might be encountered with liquid pycnometers. A variety of gases are available, including (but not limited to) helium, nitrogen, argon, carbon dioxide, sulfur hexafluoride. The correct selection is made according to sample type (mineral, vegetable, etc).
Gas pycnometry is also used for open/closed cell determination of polymer foams. Tapped density, a space-filling property of bulk powders, is reported not as one single value, but as the trend according to number of taps. Hausner Ratio and Carr's Index (both indicators of flow and compressibility properties) are reported at no additional charge. Dry powder pycnometry is used to determine geometric (envelope) volume/density of irregular pellets, granules etc.
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Analysis Types
06003
 True (Skeletal) Density by Gas Pycnometry.
Standard procedure determines true density of sample using helium pycnometry and reports average of at least three runs (tabular format only). Nitrogen is recommended for low density polymers (<1g/ml) and samples of vegetable origin. 
06003-A
Foam Open/Closed Cell by Nitrogen Pycnometry.
Open/closed cell percentages of foam polymers (cellular plastics) using nitrogen, uncorrected for cut sample. Corrected open/closed cell percentage using method ASTM D6226 (Appendix XI,
procedure 2) is considered as two analyses.The customer is expected to provide initial 1 inch (2.54cm) cube sample for analysis. Extra charge for sample preparation.
06003-C
Foam Compressibility by Nitrogen Pycnometry.Compressibility of foam sample using nitrogen pycnometry over approximate pressure range 2 psig to 20 psig. Tabular report includes % volume change as a function of initial pressure plus uncorrected open/closed cell percentages. 06003-F
Foam Fracture and Compressibility by Nitrogen Pycnometry.
Volume % cell fracture of foam sample by nitrogen pycnometry over approximate pressure range 2 psig to 20 psig. Tabular report includes % volume change as a function of initial pressure. 06004
Tap Density.
Tapped bulk density of powder or coarse particles using 1/8" drop height. Bulk volume recorded every 500 taps until no further observable change in the level of powder in the calibrated cylinder. Tabular report gives tapped bulk volume and density of the sample as a function of number of taps. Analysis can also be performed to ASTM standard specifications upon request.
06004-D
Envelope (Geometric) Density by Dry Powder Pycnometry.
Envelope density of sample determined using a free flowing powder. Usually used for irregular forms/shapes.
06005-D
Envelope (Geometric) Density by Mercury Porosimeter.Envelope (geometric) density by mercury displacement after evacuation. Envelope density reported at fill pressure (bulk density) and at 1 atmosphere (apparent density). Price includes proper disposal of mercury contaminated sample. |
