Tear strength as an important quality parameter
VTC considers tear strength to be an even more important property than tensile strength. Especially with fabrics used in clothing, tear resistance or tear strength is an important predictor of quality problems.
The degree of strength depends on all kinds of fabric characteristics such as :
- number of threads per cm in warp and weft direction
- fabric construction (binding)
- strength of the yarn used
- finish type
- synthetic resin causes attenuation
- softeners increase tear strength
The tear strength measurement is particularly useful for tight-fitting garments made of lightweight fabrics, where the forces on the fabric can be critical. Even in the case where large forces are exerted on the material, the tear strength can be tested and specified as a meaningful parameter. Knitted fabrics cannot be meaningfully tested for tear strength.
Test methods for the determination of tear strength
A large number of test methods have been developed depending on the application. Most of them are carried out using a tensile testing machine (dynamometer) and the crack is made relatively slowly during the test. A method based on the ballistic-pendulum method imitates a tear due to the action of a fast and short force.
Test methods for the determination of tear strength or tear resistance :
- EN ISO 13937-1 (Ballistic pendulum method, Elmendorf method)
- EN ISO 13937-2 (Method using trouser test pieces)
- EN ISO 13937-3 (Method using wing-shaped specimens)
- EN ISO 13937-4 (Method using tongue-shaped specimens)
- EN ISO 4674-1 (Method for coated materials)
In addition to the above methods, VTC can also determine the tear resistance using other methods. We will gladly advise you about the possibilities for your material.