ASTM D3776-96 (R2002) pdf free download.Standard Test Method for Mass Per Unit Area (Weight) of Fabric.
1.1 This test method covers the measurement of fabric mass per unit area (weight) and is applicable to most fabrics.
1.2 There are four approved options:
1.2.1 Option A—Full Piece, Roll, Bolt or Cut (Section 7).
1.2.2 Option B—Full Width Sample (Section 8).
1.2.3 Option C—Small Swatch of Fabric (Section 9).
1.2.4 Option D—Narrow Fabrics (Section 10).
1.3 The values either in SI units or U.S. customary units are regarded as standard. U.S. customary units may be approximate.
4. Summary of Test Methods
4.1 Fabric mass is calculated from the mass of a specimen the length and width of which have been measured as directed in one of the procedures in Test Method D 3773 and D 3774.
5. Apparatus
5.1 Scale, with a capacity and sensitivity sufficient to weigh the lull piece, roll, bolt, or cut units to within ±0. 1 % of their gross mass. The accuracy of the scale should be certified by a recognized authority.
5.2 Balance, having a capacity and sensitivity to weigh within ±0.1 % of the mass of the specimens being tested.
5.3 Cutting Die, either square or round with an area of at least 13 cm or 4 in:
6. Conditioning
6.1 Condition test specimens as directed in Practice D 1776.
6.2 All weighing tests should be made in the standard atmosphere for testing textiles (20 ± 1 °C (70 ± 2°F), 65 ± 2 % RH), after the specimens have been conditioned in the same atmosphere. It may be impractical to condition the specimens in Option A or nonconditioned testing may be agreed upon by the purchaser and supplier. When the full rolls or bolts of fabric cannot be properly conditioned in a reasonable Lime with available facilities, perform the tests without conditioning and report the actual conditions prevailing at the time of the test. Such results may not correspond with the results obtained after testing adequately conditioned specimens in the standard atmosphere for testing textiles.
7. Option A—Full Piece, Roll, Bolt, or Cut
7.1 Significance and Use
7.1.1 Option A for the determination of mass per unit area of woven fabrics may be used for acceptance testing of corn mercial shipments since it has been used extensively in the trade.
7.1.2 In case of a dispute arising from differences in reported test values when using Test Methods D 3776 for acceptance testing of commercial shipments. the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories.ASTM D3776 pdf download.