Subcontracted Finishing Steps Appearing after the Audit Scope Closes
Subcontracted finishing steps executed outside audited mill boundaries alter fabric fastness, strength, and chemical safety without triggering primary quality controls.
ISO 13938-1 Bursting Strength
Standardized Metric
Hydraulic pressure required to rupture a circular textile specimen provides a measure of the multi-directional resistance of a fabric. The procedure defined by ISO 13938-1 bursting strength uses a hydraulic diaphragm to apply force to a clamped textile sample. This standard applies primarily to knitted, tufted, and nonwoven materials where multi-directional stress is common.
It establishes a consistent lab environment to evaluate fabric durability.
Experimental Procedure
The laboratory apparatus holds the fabric specimen over an elastic diaphragm using a circular clamping ring. Oil or water is pumped under the diaphragm at a constant rate of flow, causing it and the fabric to distend. When the fabric bursts, the maximum pressure and the height of the dome at burst are recorded.
Mechanical Threshold
The resulting measurement is expressed in kilopascals and indicates the point at which the yarn structure fails under pressure. Thicker yarns and tighter knit structures increase the burst resistance of the material. This value is used by buyers to accept or reject fabric lots.
Quality Assessment
Satisfying the requirements of this international standard ensures that garments like sportswear do not fail during intense movement. Laboratories compare the output against baseline benchmarks defined by the brand. This test is a routine part of mill quality control.