Standard: PAPTAC - G.11

ASH IN WOOD, PULP, PAPER AND PAPERBOARD BY IGNITION AT 900°C

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Scope:

This Standard describes the determination of the ash content in wood and all types of pulp, paper and paperboard by ignition at 900oC (Note 1). The ash may consist of:

a) mineral matter in wood or pulp and various residues from chemicals used in pulp and paper manufacture

b) metallic matter from piping and machinery

c) fillers, pigments, coatings or residues from various additives

The ash content determined by this method is related to, but may not be equal to, the content of mineral constituents in the sample. For coated and filled products, the amount of added mineral constituents can only be calculated if the loss on ignition of the particular mineral or pigment used is known. This value varies from one pigment to another, and also between different batches of the same pigment. For china clay the residue on ignition at 900oC varies from 89% to 86% and for calcium carbonate it is about 56% due to its conversion to calcium oxide. On the other hand, there is minimal decomposition of calcium carbonate by ashing at 525oC, as described in PAPTAC Standard G.10. Thus, for samples containing calcium carbonate, both methods can be used in conjunction to provide a good estimate of added calcium carbonate.

Organization: Pulp and Paper Technical Association of Canada, Formerly CPPA
Document Number: g.11
Publish Date: 2013-05-01
Page Count: 5
Change Type: COMPLETE REVISION
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active

Document History

Document # Change Type Update Date Revision Status
G.11 Change Type: STCH Update Date: 1986-08-01 Status: INAC

This Standard References

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