DENSITY AND RELATIVE DENSITY OF VISCOUS MATERIALS BY BINGHAM PYCNOMETER: ASTM D1480
EXPLANATION
This test method is applicable to liquids of vapor pressures below 600 mm Hg 80 kPa and viscosities below 40 000 cSt at the test temperature. This test method can be used at temperatures between 20 and 100° C. It can be used at higher temperatures; however, in this case the stated precision of this test method does not apply.
For determination of density of materials, fluid at room temperature, use Test Method ASTM D1217. This test method also provides a calculation procedure for converting density to specific gravity.
TEST SUMMARY
The liquid sample is introduced into the pycnometer, equilibrated to the desired temperature, and weighed. The density or relative density is then calculated from this weight and the previously determined calibration factor, and a correction is applied for the buoyancy of air.
TEST PRECISION
This test method has a repeatability of 0.00005 and a reproducibility of 0.00014 g/mL for a pycnometer volume of 10 mL. This precision statement may not apply if a pycnometer other than 10 mL in volume is used or if the temperature of test exceeds 100° C.
The difference of results from the established value when compared to pure reference materials is not expected to be more than +/- 0.00014 g/mL.
Specific bias has not been established for this test method.
