AS 1301.405:2021 pdf free download – Methods of test for pulp and paper Method 405: Grammage of non-creped paper and board(ISO 536:2019, MOD)

AS 1301.405:2021 pdf free download – 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 gramniage of paper and hoard.
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 o[the referenced document (Including any amendments) applies.
Iso 186, Paper and board — Sampling to determine average qualify
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:
— ISO Online browsing platform: available at htt.ps:J/www.isu.org/ubp
— IEC Electropcdia: available at httwww.ckctropcdaurgJ
gram mage
mass per unit area
mass of a unit area of paper or board determined by a specific method of test
Notc ito rntry: Grammagc 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 H.
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.
The precision data presented in Tables B.1 and B.2 has been obtained from CEPI-CTS, the Comparative Testing Service of the Confederation of European Paper Industries. Estimates of repeatability and reproducibility from the CEPI-CTS programme are based on round-robin work in 2011 in which 17 laboratories from 11 European countries tested three different sample materials. The area of the test pieces used in the above testing service is less than the preferred minimum of 50 000 mm2
The calculations have been made according to ISO/TR 24498(11 and TAPPI T 1200121.
The repeatability standard deviation reported in Table B.1 is the ‘pooled repeatability standard deviation; that is, the standard deviation is calculated as the root-mean-square of the standard deviations of the participating laboratories. This differs from the conventional definition of repeatability in ISO 5725-1(1.
The repeatability and reproducibility limits reported are estimates of the maximum difference which should be expected in 19 out of 20 instances, when comparing two test results for material similar to those described under similar test conditions. These estimates may not be valid for different materials or diflerent test conditions.
Repeatability and reproducibility limits are calculated by multiplying the repeatability and reproducibility standard deviations by 2,77.
NOTE I The repeatability standard deviation and the within-laboratory standard deviation are identical.
However, the reproducibility standard deviation Is NOT the same as the between-laboratory standard deviation.
The reproducibility standard deviation includes both the between-laboratory standard deviation and the within-
laboratory standard deviation, viz.