ASTM D586-97 pdf free.Standard Test Method for Ash in Pulp, Paper, and Paper Products.
When the specimen is completely combusted,asindicated by the absence of black particles, remove the cruciblefrom the furnace, replace the cover, and allow to cool some-what; then place in a desiccator containing indicating gradeanhydrous alumina and cool to room temperature. Weigh thecrucible with ash to the nearest 0.1 mg.Repeat the ignition andweighing until the weight of the ash is constant to  0.2 mg.10.3 Ash Determination—Method B—Ignition at 900°C:10.3.1 Carefully clean the empty crucible and ignite in amuffle furnace at 900  25°C for 30 to 60 min.After ignition,cool slightly and then place it in a desiccator，containingindicating-grade anhydrous alumina. When cooled to roomtemperature,weigh the ignited crucible on the analyticalbalance to the nearest 0.1 mg. Transfer the test specimen to the crucible.Ignite thespecimen in the crucible on the hearth of the furnace until wellcarbonized or directly over a low flame of a bunsen burner. Ifthe crucible is too small to hold the entire specimen,gentlyburn the portion added and add more as the flame subsides, butin either case protect the content of the crucible with a lid orcovers so that a portion of the ash will not be blown from thecrucible. When the residue has ceased to burn with a flame,place the crucible with specimen into the furnace at 900 25C and remove the lid after the crucible seems to havereached the temperature of the furnace. When the specimen is completely combusted, as indi-cated by the absence of black particles,remove the cruciblefrom the furnace, replace the cover， and allow to cool some-what;then place in a desiccator containing indicating gradeanhydrous alumina and cool to room temperature. Weigh thecrucible with ash to the nearest 0.1 mg. Repeat the ignition andweighing until the weight of the ash is constant to 0.2 mg.Report the ashing temperature and the percent of ashfor each test unit as the average of at least two determinationsto the nearest 0.05 % for papers containing 5 % ash or less, tothe nearest 0.1 % for papers containing 5 to 10 % ash, or to thenearest 0.2 % for papers containing more than 10 % ash.ASTM D586 pdf download.