Standard: TAPPI
Method: T 244
Title: Acid-insoluble ash in wood, pulp, paper, and paperboard
Overview
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. Silica or silicates, the major components of the acid-insoluble ash, are normally present in very small quantities. If excessive amounts are present and carried into the finished paper, particularly of “fine” or specialty grades, they may cause undesirable abrasion of metal repeatedly applied to the paper, such as punches, dies, knives, or type. This test is not suitable for low basis weight material such as tissue and toweling.
Samples
This test is performed in duplicate. At least 55 grams and preferable 120 grams of dried material should be submitted per sample. A minimum of two samples submitted at the same time is required.
Please note:
IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.