ASTM D1122 for density or relative density of engine coolant concentrates
ASTM D1122 standard test method for density or relative density of engine coolant concentrates and engine coolants by the hydrometer
8. Precision and Bias
8.1 Precision:
8.1.1 Repeatability - For different operators their results should vary not more than 0.0012 from the average value when the relative density of the engine coolant concentrate sample is between 1.0000 and 1.1300.
8.1.2 Reproducibility - For different apparatus the results should vary not more than 0.0012 from the average value when the density or relative density of the engine coolants concentrate is between 1.0000 and 1.1300.
8.2 Bias - Bias of the procedure in this test method for measuring density or relative density has not been determined because an accepted reference material has not been determined.
9. Keywords
9.1 engine coolant; engine coolant concentrate; hydrometer; relative density
