I. Pre-Test Preparation
1. Environmental Conditioning
Place the sample and standard rubbing white material in an environment with a temperature of 20℃±2℃ and a relative humidity of 65%±4% for at least 4 hours (wet rubbing) or 7 hours (dry rubbing).
2. Sample Requirements
Size: Not less than 50mm×200mm, one set each in the warp and weft directions.
Multi-color Samples: Ensure all colors are rubbed; if the area is large enough, samples should be taken separately.
Different Materials on the Front and Back: Must be tested separately.
3. Consumable Preparation
Rubbing Cloth: Undyed cotton cloth without fluorescent whitening agents, cut to 50mm×50mm (round rubbing head) or 25mm×100mm (rectangular rubbing head).
Sandpaper: Used to fix the bottom of the sample (required for some instruments).
II. Dry Friction Test Procedure
Fix the sample on the sample stage, ensuring the length direction aligns with the friction stroke and that it is taut and wrinkle-free.
Take a dry friction cloth and wrap it around the friction head, ensuring the warp direction is parallel to the direction of motion, and clamp it with the retaining ring.
Adjust the friction head pressure to 9N ± 0.5N, and set the stroke to 100mm.
Set the number of friction cycles (usually 10 cycles or as specified by the customer), and start the instrument for automatic operation.
After the test, remove the friction cloth, allow it to equilibrate at room temperature, and gently remove any loose fibers with tape.
Use a staining grey card for comparison and rating, and record the grade (1-5).
III. Wet Friction Test Procedure
Immerse a friction cloth of the same specification completely in distilled water. After removal, squeeze it using a squeezing device until the moisture content is 95%~105% (approximately 2.3~2.5 times the weight of the dry cloth).
Perform the test immediately to prevent moisture evaporation from affecting the results.
The operating procedure is the same as for dry friction. After friction, dry the friction cloth at a temperature below 60℃ or air dry it naturally.
After drying, remove the fibers with tape, then compare the result with the grey card for rating.
⚠️ Note: Dry and wet tests should not be repeated on the same part of the sample to avoid cross-interference.
IV. Result Evaluation and Reporting
Use ISO 105-A03 or AATCC staining grey card for visual comparison.
When rating, it is recommended to place the cloth to be evaluated under three layers of unused white cloth to improve the accuracy of the comparison.
The report should include: test standard, sample information, dry/wet friction rating, environmental conditions, etc.
