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Description

1.The certified value is got by hadgrove method after statistical calculation. Uncertainty is got by combination of extended uncertainty at 95% confidence interval and uncertainty of change that may cause within 3 years. 2.The sample is packed in plastic bottle with size between 0.63-1.25 mm. The minimum package is 250 grams. 3.The minimum weight for analysis is 50g, each sample should be test 4 times. The powder that may caused during shipment should be got rid of by pass 0.63 mm sieve before test. The Hadgrove machine should keep speed at 60±0.25rpm during the test. 4.These CRMs consist of a set of 4 samples with different Hadgrove Grindability index. They should be used together for preparation of calibration chart of Hadgrove machine. 5.The valid time for these samples are 3 years, although we reserve the right to make change as issue revisions.