Wholesale Secondary Reference Material – Certificate of Certified Reference Material Ash fusibility – Shandong Institute of Metallurgical Science
Wholesale Secondary Reference Material – Certificate of Certified Reference Material Ash fusibility – Shandong Institute of Metallurgical Science Detail:
This certified reference material is made from carefully selected raw coal. The coal was air dried, reduced in size to <0.2mm and ignited at 815℃ to constant mass and homogenized, then packaged in to individual bottled units.
The homogeneity test was done on the bottled units by determination of the sulfur in ash and FT under the reducing atmosphere. The minimum mass of sample taken for analysis is 0.05g(sulfur) and about 0.15g(FT). Variance analysis showed that the variability among different bottles was not significantly different from the variability between replicate determinations.
Sample Number |
Testing atmosphere |
Certified value and Uncertainty |
Characteristic Melting Temperature (℃) |
|||
Deformation Temperature (DT) |
Softening Temperature (ST) |
Hemispheric Temperature (HT) |
Flowing Temperature (FT) |
|||
GBW11124g |
Reducing |
Certified value Uncertainty |
1161 17 |
1235 18 |
1278 14 |
1357 16 |
Oxidizing |
Certified value Uncertainty |
1373 15 |
1392 16 |
1397 13 |
1413 19 |
Here, the reducing atmosphere is obtained by introducing into the furnace the mixture gases of (50±5)% CO2 and (50±5)% H2 (in the most tests) or by sealing in the furnace the proper ratio of graphite and anthracite (in a few tests); the oxidizing atmosphere is obtained with air circulates freely through the furnace.
The certification analyses were performed according to the Chinese National Standard GB/T219-2008 by several qualified laboratories.
The certified value is expressed as XT±U,were XT is the mean value and U is the expanded uncertainty(95% confidence level).
The preparation of samples, the statistical analysis and overall direction and coordination of the technical measurements leading to certification were by China National Coal Quality Supervision and Testing Center, China Coal Research Institute.
This certified reference material is stable at long time. China National Coal Quality Supervision and Test Center will monitor the change of certified value regularly and inform the users if any significant change is observed.
1) This certified reference material is packed in a plastic bottle, 30g/ bottle.
2) The bottle containing material should be kept tightly stopped and stored in cold and dry place, and opened only when necessary.
3) This certified reference material is mainly used in the examination of the testing
atmosphere and the estimation of the test result. The testing atmosphere is correct if the differences between test result and certified value of ST, HT, FT are not over 40℃; otherwise, the testing atmosphere is not correct, and some adjustments are necessary.
4) This certified reference material is not applicable in the identification of the deviation of furnace temperature, the users should be sure the furnace temperature has been controlled correctly before the testing.
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