IS 6490 : 2025 Textiles - Stiffness Characteristic of Fabrics - Methods of Test
1 SCOPE
1.1 This standard prescribes two methods for determination of stiffness of fabrics made from any textile fibre or a blend of two or more textile fibres by the measurement of bending length.
Method A - Cantilever test; and
Method B - Heart loop test.
1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.
1.3 The ‘Method A’ is not suitable for very limp fabric or those that show a marked tendency to curl or twist at a cut edge (see Fig. 1). Whereas the ‘Method B’ is suitable for very limp fabrics or the fabrics which shows a tendency to curl or twist.
2 REFERENCES
The standards given below contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards:
| IS No. | Title |
| IS 196 : 2024 | Atmospheric conditions for testing (second revision) |
| IS 1964 : 2001 | Textiles - Methods for determination of mass per unit length and mass per unit area of fabrics (second revision) |
| IS 3919 : 1966 | Methods for sampling cotton fabrics for determination of physical characteristics |
| IS 6359 : 2023 | Method for conditioning of textiles (first revision) |
| IS 6668 : 1972 | Method for preparing test specimens from fabric samples for physical tests |