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ASTM International , 03/01/2017
Publisher: ASTM
File Format: PDF
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1.1This test method measures the sewn seam strength in woven fabrics by applying a force perpendicular to the sewn seams.
1.1.1The axis perpendicular to the sewn seam can represent either the warp yarn axis or filling yarn axis, the same axis tested when using grab Test Method D5034.
1.1.1.1This test method is applicable to sewn seams obtained from a previously sewn article or seams sewn with fabric samples using one of two specific seam assemblies as shown in Table 1.
Fabric Mass: ≤ 4 oz/yd² [130 g/m²]
Procedure A
Procedure B
Mass
up to 4 oz/yd² [130 g/m²]
Seam allowance
13 mm [0.5 in.]
Needle:
Size
Metric 90 [0.036 in.]
Finish
chrome
Point
thin ball (No. 1/No. 23)
Sewing thread size:
Spun Polyester
Tex 40
Polyester-Core
Seam Type
Ssa-1
Stitch Type
301
401
Stitch Density
4.7 ± 1/2stitches per centimetre
[12 ± 1/2stitches per inch]
Fabric Mass: > 4 oz/yd² [130 g/m²] ≤ 8 oz/yd² [270 g/m²]
4 oz/yd² [130 g/m²] up to 8 oz/yd² 270 g/m²
4 oz/yd² [130 g/m²] up to 270 g/m2 [8 oz/yd² ]
Seam Allowance
Metric 110 [0.044 in.]
ball
Sewing Thread:
Tex 60
Seam type
SSa-1
Stitch type
Stitch density
3.1 ± 1/2stitches per centimetre
[8 ± 1/2stitches per inch]
[8.5 ± 1/2stitches per inch]
Fabric Mass: > 8 oz/yd2 [270 g/m²] ≤ 12 oz/yd2 [405 g/m²]
8 oz/yd2 [270 g/m²] up to 12 oz/yd2 [405 g/m²]
Metric 120
Tex 80
Note 1:When the performance of a woven textile structure requires data to indicate the maximum seam strength that will result in the failure of fabric on either side of seam, the standard seam can be changed to use the Lapped seam type construction with two or more rows of stitching: Lsc-2; Lsc-3; Lsc-4; and the maximum number of stitches per inch that can be used. (See Practice D6193.)
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