ASTM D6743 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
10. Report
10.1 The test results shall be reported as the average value of samples taken from all test cells as follows:
10.1.1 Name and chemical composition of heat transfer fluid.
10.1.2 Test duration, in hours.
10.1.3 Test temperature, in °C, and amount of variation.
10.1.4 Initial boiling point and final boiling point of thermally stressed fluid, in °C.
10.1.5 Initial boiling point and final boiling point of unstressed fluid, in °C.
10.1.6 Gaseous decomposition products, in mass percentage.
10.1.7 Low boiling components, in mass percentage, as calculated by Eq 1.
10.1.8 High boiling components, in mass percentage, as calculated by Eq 2.
10.1.9 Decomposition products that cannot be vaporized, in mass percentage.
10.1.10 Decomposition products remaining in the test cell, in mass percentage.
10.1.11 Total low boiling decomposition products, in mass percentage, as calculated by Eq 3.
10.1.12 Total high boiling decomposition products, in mass percentage, as calculated by Eq 4.
10.1.13 Visual appearance of thermally stressed fluid and test cell as compared to the unstressed fluid and clean test cell, particularly noting the presence of solid deposits.
10.1.14 Conditions not in accordance with those specified in this test method.
10.1.15 Date and time at beginning of test and end of test.
10.1.16 Number of test cells heated.
11. Precision and Bias
11.1 Precision - The precision of this test method is based on a single laboratory study conducted in 2010. The precision statement was determined through statistical examination of 12 results, from a single laboratory, on these two materials:
Material A: Synthetic organic heat transfer fluid
Material B: Mineral oil heat transfer fluid
Every "test result" represents an individual determination. The laboratory reported three replicate test results for each material/analysis combination. Except for the use of only one laboratory, Practice E691 was followed for the design and analysis of the data; the details are given in ASTM Research Report No. RR:D02-1733.
11.1.1 The repeatability standard deviation and repeatability limit values have been determined to be the values shown in Tables 1 and 2.
11.1.2 Any judgment in accordance with the values in Tables 1 and 2 would normally have an approximate 95 % probability of being correct, however the precision statistics obtained in this ILS must not be treated as exact mathematical quantities which are applicable to all circumstances and uses. The limited number of laboratories reporting replicate results guarantees that there will be times when differences greater than predicted by the ILS results will arise, sometimes with considerably greater or smaller frequency than the 95 % probability limit would imply. Consider the repeatability limit as a general guide, and the associated probability of 95 % as only a rough indicator of what can be expected.
11.2 Bias - At the time of the study, there was no accepted reference material suitable for determining the bias for this test method, therefore no statement on bias is being made.
12. Keywords
12.1 heat transfer fluids; thermal degradation; thermal fluids; thermal stability
