Tear Standard
Standardized test protocols specify ballistic pendulum procedures for determining tear force in woven and nonwoven fabric specimens. Compliance with iso 13937-1 governs how dynamic tearing energy is measured as a pendulum cuts through pre-notched fabric samples in warp and weft directions. The test apparatus measures energy lost during single-rip tearing and converts potential energy displacement into force values expressed in newtons.
Technical garment specifications mandate this standard to verify mechanical resistance against snagging and tearing during wear.
Interchangeable Operation
Interchangeable pendulum capacities accommodate light fashion fabrics as well as heavy industrial canvas constructions. Dropping the pendulum from a fixed height ensures uniform impact velocity across all tested specimens.
Laboratory Execution
Laboratory technicians condition fabric samples under standard atmospheric conditions of twenty degrees Celsius and sixty-five percent relative humidity before testing. Five warp and five weft specimens undergo testing, with mean values reported to verify lot compliance against buyer standards. Precision notches cut prior to pendulum release establish localized stress concentration points that force tearing along intended thread lines.
Material Boundary
This test standard excludes knitted fabrics and elastic woven structures that deform excessively without undergoing discrete yarn breakage. Heavily coated fabrics that delaminate during tearing yield erratic results that cannot be benchmarked against standard fabric grades.