BS 2471:2005 pdf free.Textiles — Woven fabrics—Determination of mass per unit length and mass per unit area.
BS 2471 The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies.For undated references, the latest edition of the referenceddocument (including any amendments) applies.
BS EN 1773,Fabrics – Determination of width and length.
BS EN ISO 139, Textiles — Standard atmospheres for conditioning and testing.
Method 1—Measurement on short samples or cuttings that can be conditioned in thestandard atmosphere for testing
After conditioning, the length and the mass of the fabric are determined and the mass per unit lengthcalculated, or the length, width, and mass of the fabric are determined and the mass per unit areacalculated, as required.
Method 2—Measurement on bulk pieces that can be conditioned in the standardatmosphere for testing
After conditioning, the length and the mass of the whole piece of fabric are determined and the mass perunit length calculated, or the length, width, and mass of the fabric are determined and the mass per unitarea calculated, as required.
Method 3— Measurement on bulk pieces that cannot be conditioned in the standardatmosphere for testing
When it is impracticable to condition the whole piece in the standard atmosphere for testing,the length(and width) and the mass of the piece are determined after relaxation in the prevailing atmosphere, and acorrection factor is applied to give the conditioned values.The conditioned mass per unit length(or massper unit area) is then calculated. The correction factor is determined by comparison of the length (andwidth) and the mass of a specific portion cut from the piece after relaxation, measured firstly in the ambientatmosphere and then in the standard atmosphere for testing.
If the mass per unit length (or area) of the selvedge differs appreciably from the mass per unit length (orarea) of the fabric, the mass per unit area shall be determined on a sample from which the selvedges havebeen removed along the outermost warp threads of the body, and calculation(s) shall be based on the massof the trimmed sample and its length and width.BS 2471 pdf download.