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TAPPI T244 cm-99
- Acid-Insoluble Ash in Wood, Pulp, Paper, and Paperboard
- standard by Technical Association of the Pulp and Paper Industry, 10/22/1999
- Publisher: TAPPI
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This method describes a procedure for determining the acid-insoluble ash content of cellulose samples.The sample is dry-ashed and the residue treated with hydrochloric acid. The insoluble residue is filtered, washed, ignited, and weighed.This method measures all acid insoluble material. For a more accurate but time-consuming wet-ash procedure for determining the silicates and silica content of pulp, see TAPPI T 245 "Silicates and Silica in Pulp (Wet Ash Method)."
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