ASTM D3107:19 pdf download

ASTM D3107:2019 pdf download.Standard Test Methods for Stretch Properties of Fabrics Woven from Stretch Yarns.
7.3.3 For fabric widths less than 125 mm (5 in.), use the entire width of the laboratory sampling unit for specimens.
7.3.4 Ensure specimens are free of folds, creases, or wrinkles. Avoid getting oil, water, grease, etc. on the specimens when handling.
7.3.5 If the fabric has a pattern, ensure that the specimens are a representative sampling of the pattern.
7.3.6 Ravel the specimens to a width of 50 ± 1 mm (2.00 ±
0.05 in.) taking approximately the same number of yarns from each side of the specimen.
7.3.7 Fold one end of the specimen 32 mm (1.25 in.) and stitch a seam approximately 25 mm (I in.) from the fold.
7.3.8 Cut a slit approximately 10 mm (/8 in.) long in the center of the strip on the fold.
7.3.9 Lay the specimen on a smooth flat surface and allow to relax for 30 mm.
8. Conditioning
8. 1 Bring the test specimens to moisture equilibrium for testing in the standard atmosphere for testing textiles as directed in Practice D1776 or, if applicable, in the specified atmosphere in which the testing is to be performed.
9. Preparation of Test Apparatus and Calibration
9. 1 Verify measuring scales and tension weights are within calibration.
10. Procedure
10. 1 Test the test specimens in the standard atmosphere for testing textiles, as described in Practice D 1776. Handle the test specimens carefully to avoid altering the natural state of the material.
10.2 Place bench marks at least 250 ± 1 mm (10 ± 0.05 in.) apart in the center of the specimen.
10.3 Fabric Stretch After Applying a Specified Tension:
10.3.1 Select the tension option (1) 1.8 kg (4.0 Ib) or (2)
1.35 kg (3 ib) as directed in a material specification or contract order. In the absence of a material specification or contract order use option I.
10.3.2 Clamp the end of one specimen in the top clamp of the stretch tester so that the folded and sewn loop end hangs freely.
10.3.3 Measure and record the distance between the bench marks to the nearest I % or 1 mm (0.05 in.) and record as Distance O (original before tension is applied).
10.3.4 Insert a dowel pin, or equivalent, through the loop and place the tension weight hook through the slit in the fold and over the dowel pin, thereby providing the specified tension to the specimen.
10.3.5 Pre-stress the specimen slowiy by cycling three times between 0 and the total tension specified. A complete cycle should take approximately 5 s of which the specimen is under the specified tension for approximately 3 s.
10.3.5.1 Following the third cycle, apply the specified tension for a fourth time and measure the fabric stretch as directed in 10.3.6.