Prescribes procedures for the determination of ash content of wood, pulp, paper and board. The revision includes a change to the ashing temperature. There are optional temperatures for paper and board, and the selection of temperature will depend on the purpose of the test. It is common practice to incorporate calcium carbonate into certain papers and boards. A temperature of 900 degrees Celsius will decompose calcium carbonate to calcium oxide, a temperature of 520 degrees Celsius will leave calcium carbonate undecomposed. The user will choose one of these temperatures depending on which form of calcium is required in the residue. The ashing temperature for wood and pulp is now 925 ± 25 degrees Celsius to bring it into line with the high temperature ashing of paper.

This Standard prescribes procedures for the determination of ash content of wood, pulp, paper and board.

First published as Appita P418m-1956.Appita P3m first published 1958.Second edition Appita P418m-1959 (endorsement of British PBMA PT20:rp:1950).Second edition Appita P3m-1959.Third edition 1962.Appita P418m-1959 revised and redesignated AS P1.P418m-1965.Appita P3m-1962 revised and redesignated AS P1.P3m-1969.AS P1.P418m-1965 revised and redesignated AS 1301.P418s-1978.AS P1.P3m-1969 revised and redesignated AS 1301.P3s-1978.AS 1301.P3-1978 and AS 1301.P418s-1978 jointly revised and redesignated as Joint Standard AS/NZS 1301.418s:1994. First published as Appita P418m-1956. Appita P3m first published 1958. Second edition Appita P418m-1959 (endorsement of British PBMA PT20: rp:1950). Second edition Appita P3m-1959. Third edition 1962. Appita P418m-1959 revised and redesignated AS P1.P418m-1965. Appita P3m-1962 revised and redesignated AS P1.P3m-1969. AS P1.P418m-1965 revised and redesignated AS 1301.P418s-1978. AS P1.P3m-1969 revised and redesignated AS 1301.P3s-1978. AS 1301.P3-1978 and AS 1301.P418s-1978 jointly revised and redesignated as Joint Standard AS/NZS 1301.418s:1994.