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Quality Testing
All zippers made by DaSun Zipper have good quality because they must pass various quality tests. Zippers that are disqualified are not allowed to leave our production facility.
There is no need for concern whether the real zippers are the color chosen by you because the tapes and teeth of completed zippers have to be tested for chromatism aberration with the given samples of customers under different types of light including daylight 6500K and F/A light from showcase.
The teeth, top end and bottom end of zippers made by DaSun Zipper are made of metal that is resistant to be corroded so the zippers won't be damaged easily in humid or rainy places. DaSun Zipper pays high attention to the quality of zippers so you don't need to worry about it. The resistance to corrosion test in DaSun Zipper is stricter than normal standards and specialized testing machines are equipped by the company. The smoke used for testing features saline with a 5% concentration and the pH value of the liquid is 3. Zippers will be tested for 3 hours.
DaSun Zipper will eliminate your concerns by performing comprehensive performance testing on zippers. The test will be done once the completed zippers are 1000 dozens. If you are still worried, DaSun Zipper will connect with you online and show the testing process in video. After testing, the report will be sent to you.
The sliders of zippers will be pulled many times, you may have experienced a situation in which the slider cannot be pulled. This problem mainly happens when the pull of slider is stuck or damaged. DaSun Zipper tests the fatigue strength of different zippers through a reciprocating fatigue test and zippers have different standards due to their raw materials. The standards are as follows:
Type of zipper | Gauges of zipper teeth | ||
3#, 4# | 5#, 7#, 8# | ||
Metal zipper | Normal | 400 times | 1000 times |
Better | 800 times | 1500 times | |
Best | 1500 times | 2000 times | |
Plastic zipper | Normal | 800 times | 1000 times |
Better | 1500 times | 2000 times | |
Best | 2000 times | 3000 times | |
Nylon zipper | Normal | 800 times | 1000 times |
Better | 1500 times | 2000 times | |
Best | 2000 times | 3000 times |
Direction of force | Gauges of zipper teeth | 3# | 4# | 5# | 6# | 8# | 9# |
Lateral | 7N | 10N | 16N | 16N | 24N | 30N | |
Longitudinal | 5N | 9N | 14N | 14N | 18N | 23N |