Abstract： AS 1301.405:2021 pdf download.Methods of test for pulp and paper Method 405: Grammage of non-creped paper and board. 5.2 Balance, sufficiently accurate, over the range of mass for which it is used, to measure the test piece mass to within 0...

AS 1301.405:2021 pdf download.Methods of test for pulp and paper Method 405: Grammage of non-creped paper and board.

5.2 Balance, sufficiently accurate, over the range of mass for which it is used, to measure the test piece mass to within 0,5 % of the actual mass. It shall be sensitive enough to detect a change of ±0,2 % in the mass to be weighed and, if the balance is of

the direct-reading type, it shall be graduated so that readings may he taken to this degree of accuracy.

5.3 Special sheet-weighing balances, designed to weigh test pieces of a given size and which indicate grammage directly, may be

used, provided that the above conditions for determination of mass are lullilled and that the area of each test piece on a single

weighing Is not less than 50000 mm2 (500 cm2) and not more than 100 000 mm2 (1 000 cm2) (see Clause 8 and 9.2).

When In use, the balance shall be shielded From air currents.

6 Sampling

The selection of units and sheets and the taking of specimens shall be carried out in accordance with iso 186. if tests are made on another type of sample, make sure that the specimens taken are representative of the sample received. If possible, take at least

five specimens and take an area sufficient for at least 20 test pieces.

II the as taken grammage is to be determined, the influence of the ambient atmosphere on the moisture content of the specimens

shall be minimised (see A.2).

7 Conditioning

For the determination of conditioned grammage, and oven-dry” grammage, the specimens shall be conditioned in accordance with ISO

187.

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