1. Subject content and scope of application This standard provides for the chemical analysis of graphite reagents, instruments, analytical procedures, results calculation and tolerance. This standard applies to natural graphite product moisture, volatile, ash, fixed carbon, sulfur and acid-soluble iron analysis.
2. Reference standard GB/T 3518 phosphor sheet graphite GB/t 3519 microcrystalline Stone Ink 3 General provisions
3. According to GB/T 3518 and GB/T 3519 sampling methods obtained by the chemical analysis samples should be installed in plastic bags or grinding bottles, the sample quantity is not less than 50g.
4. In addition to moisture determination of the sample, the rest of the analysis of the project should be the specimen under 105￣110℃ drying to constant weight after analysis.
5. High, medium and low carbon sample weighing should be accurate to 0.1mg, the requirements of constant weight, two times the difference between weighing not greater than 0.3mg. High purity Graphite, the sample weighing should be accurate to 0.02mg, constant weight of two times the difference between weighing not greater than 0.05mg.
6.Each analysis project must carry on the parallel determination. The analysis of sulphur should be carried out in blank test, the titration analysis of iron should be controlled, and the measured results should be corrected.
7. High purity Graphite calculated results to three decimal places, the rest of the calculation results are expressed to two decimal places.
