石炭関連JISにおける「恒湿ベース」の廃止について

抄録

The equilibrium moisture base of coal at 75‰ relative humidity and at a room temparature has been one of the moisture basis specified in the Japanese Industrial Standards (JISs) related to coal analysis.
The abolition of it has been disputed since 1950s with a view of improving precision of the coal analysis and due to necessity of leveling the JISs with those of the ISO (International Organization for Standardization) to reduce the trade friction.
The questionnaire was sent among the 80 coal-dealing companies by the Union of Japanese Scientists and Engineers as to establish whether the equilibrium moisture base should be abolished or preserved. 59 companies have answered the questionnaire, 51 of which unconditinally agreed with the abolition of the equilibrium moisture base.
Based on the possitive results of the questionnaire, the equilibrium moisture base was decided to be abolished in the JISs at the occassions of their next revision.
JIS M8812 and M8814, at present under revision, are the first ones to undergo the equilibrium moisture base abolition in their drafts. M8810 is the one to follow.