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ISO 2144 5th Edition, May 15, 2015
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Paper, board and pulps - Determination of residue (ash) on ignition at 900 °C
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This International Standard describes the determination of the residue on ignition of pulps, papers, and boards. The International Standard is applicable to all types of pulp, paper, and board. The lower limit of the determination is about 0,2 %.

NOTE The procedure (Clause 7) requires that at least 10 mg of residue is weighed. The limit stated above corresponds to a 5 g sample. If the sample size is increased, this limit can be lowered.