ASTM D1388 –Standard Test Method for Stiffness of Fabrics
Significance and Use
Both test options in this test method are considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing.
In case of a dispute arising from differences in reported test results when using this test method 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.
Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. Test specimens should then be randomly assigned in equal numbers to each laboratory for testing.
The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.
In general, these procedures are more suitable for testing woven fabrics than knit fabrics.
The Cantilever Test Option is the preferred procedure because it is simpler to perform. It is, however, not suitable for very limp fabrics or those that show a marked tendency to curl or twist at a cut edge.
The Heart Loop Test Option is suitable for fabrics that show a tendency to curl or twist.
Both options can provide a correlation with a subjective evaluation of a given fabric type. That is, a higher number represents a stiffer fabric.
The stiffness of a fabric may change with storage.
No evidence has been found showing that bending length is dependent on the width. The tendency for specimens to curl or twist will affect the result, because of the rigidity provided at the edge. Consequently, the wider the strip, the less important is the edge effect.
Scope
This test method covers the measurement of stiffness properties of fabrics. Bending length is measured and flexural rigidity is calculated. Two procedures are provided.
Option A—Cantilever Test, employing the principle of cantilever bending of the fabric under its own mass.
Option B—Heart Loop Test, employing the principle of a loop formed in a fabric strip and hung vertically.
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