ASTM D4892 Standard Test Method for Density of Solid Pitch (Helium Pycnometer Method)
13. Report
13.1 Report density of the pitch to two decimal places as follows: density, 25°C, g/cm3.
14. Precision and Bias
14.1 Precision - The following criteria shall be used for the acceptability of results (95 % probability):
14.1.1 Repeatability - Duplicate values by the same operator shall not be considered suspect unless they differ by more than 0.02.
14.1.2 Reproducibility - The values reported by each of two laboratories, representing the arithmetic average of duplicate determinations, shall not be considered suspect unless the reported values differ by more than 0.03.
14.2 Bias - During the interlaboratory study to determine the precision of this test method, the density was also determined by Test Method D2320 (water pycnometer). It was found that the density determined by helium pycnometer was higher than that determined by water pycnometer by an average value of 0.004.
15. Keywords
15.1 density; helium pycnometer; pitch
