8. Test Procedure
8.1 Machine Setup
Power on the tensile testing machine, select the test programme and input the test ID. Set the grip separation speed by specimen type:
- Type A, B, C specimens: (500 ± 50) mm/min
- Type T, CP specimens: (50 ± 5) mm/min
8.2 First Specimen
Take one sole specimen. Using a standard thickness gauge with 0.01 mm resolution, measure thickness at three points along the test region; record the mean as the specimen thickness.
Clamp the specimen in the testing machine grips per the type-specific fixture geometry, ensuring the specimen is centred and not pre-loaded.
Start the test. Hold the machine at the set separation speed until the specimen is fully torn. Record the peak force.
For T-type and CP-type specimens, record both the peak force and the force-displacement curve — directional analysis is required at the report stage.
8.3 Remaining Specimens
Repeat 8.2 for the remaining four specimens, in random order, and record peak force for each.
8.4 Discarding Outliers
If any specimen tears outside the gauge length or shows obvious defects at the tear initiation, discard that result and prepare an additional specimen from the same batch.