ASTM D3523 Test Method for Spontaneous Heating Values of Liquids and Solids (Differential Mackey Test)
9. Calculation and Report
9.1 Tabulate the values obtained for tR and tS and the temperature differences, Δt, which are associated with each as follows:
Δt = tS - tR
9.2 Calculate the temperature difference found at the maximum temperature, TS, attained by the sample as follows:
ΔT = TS - TR
9.3 Apply the instrument blank correction to the temperature differences at Δt and ΔT as follows:
ΔtC = Δt - (BS - BR) = Δt - ΔTB
ΔTC = ΔT - (BS - BR) = ΔT - ΔTB
9.4 Report the maximum value calculated for ΔtC or ΔTC (usually ΔTC) as the spontaneous heating value of the sample, SHV, at the initial reference temperature. For solid samples, report the particle size.
10. Precision and Bias
10.1 Because of the complex nature of Test Method D3523 for spontaneous heating values, and because of the expensive equipment involved, there is not a sufficient number of volunteers to permit a cooperative laboratory program for determining the precision and bias. If the necessary volunteers can be obtained, a program will be undertaken at a later date.
11. Keywords
11.1 Differential Mackey Test; liquids; solids; spontaneous heating; spontaneous heating values
