ASTM D6022 Standard Practice for Calculation of Permanent Shear Stability Index
7. Report
7.1 If the degree of thickening is less than 1.2, report PSSI cannot be determined by this practice.
7.2 If the degree of thickening is greater than or equal to 1.2, report the calculated PSSI to the nearest whole number, the test method used for shearing, the test method used to measure viscosity, the identity of the base fluid, and the degree of thickening.
8. Precision and Bias
8.1 The calculation of PSSI is exact, and no precision limits can be assigned to this calculation.
8.2 The accuracy of calculated PSSI will depend on the precision of the viscosity determinations and the precision of the shearing method.
8.3 See Appendix X1 for a discussion of the expected variation in PSSI.
8.4 Bias - The calculation of Permanent Shear Stability Index is exact, and no bias can be assigned to this calculation.
9. Keywords
9.1 permanent shear stability index; shear; shear stability index; viscosity loss
