ACID-INSOLUBLE ASH IN WOOD, PULP, PAPER, AND PAPERBOARD

• Determining the acid-insoluble ash content of cellulose samples.
• Sample is dry- ashed and the residue treated with hydrochloric acid.
• Insoluble residue is filtere, washed, ignited, and weighed.
• Method measures all acid insoluble material.
• Shows 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).”
• Silica or silicates are the major components of the acid-insoluble ash.

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