AS 1301.405:2021 Methods of test for pulp and paper Method 405: Grammage of non-creped paper and board (ISO 536:2019, MOD).
This document specifies a method for determining the grammage of paper and board.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and puips — Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples
ISO 287, Paper and board — Determination of moisture content of a lot — Oven-drying method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
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mass per unit area
mass of a unit area of paper or board determined by a specitic method 01 test
Note 1 to entry: Grammage is expressed in grams per square metre.
4 Principle
The area of the test pieces and their masses are determined and the grammage is calculated.
For details regarding the test method precision, see Annex 13.
5 Apparatus
5.1 Cutting device, capable of repeatedly cleanly cutting test pieces to within ±1,0 % of the same nominal area, for most paper and board products. This shall be checked frequently by measurement. Provided that the above accuracy is attained, the nominal area shall be used for calculating grammage.
With certain types of paper and board it will be found, after carrying out this determination of area, that test pieces cannot be cut to within ±1,0 % of the nominal area. In such instances the dimensions of each test piece shall be determined to the nearest 0,5 mm and its area calculated.AS 1301.405 pdf download.