An estimation of the uncertainty of the determination is required as a part of method validation. The determination of the vicat softening temperature is affected by a large number of uncertainty sources originating from the different steps of the laboratory procedures applied and equipment of the measuring device. Many factors determine the accuracy and reliability of tests and / or calibrations performed on the device.in the present paper, for order to evaluate the validity and reliability of the results, the parameters of the test and machine uncertainties were studied. The apparatus consisting, heating equipment, indenting tip, weights, penetration-measuring device and temperature-measuring device were studied periodically with refrence equipment. The Uncertainty of components was calculated with uncertainty from resulting reproducibility. The maximum contribution uncertainty was related to reproducibility with 98.989%, and the lowest value were related to weight and penetration measurement gauge with 0.00028% and 0.006%, respectively. The value of extended uncertainty at 95% confidence level with coverage coefficient K = 2 was as 0.84 calculated.
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