Zippers usually require pull testing and durability testing to ensure their quality and performance. Here are some common zipper testing methods:

1. Pull test:

This test method is used to measure the maximum pull force of a zipper. During the test, fix one end and apply tension to the other end until the zipper breaks or the tension reaches a preset limit. This test can help evaluate the strength and durability of the zipper.

2. Durability test:

This test method is used to simulate the performance of zippers after long-term use. During the test, the zipper is loaded into a test machine, and then the opening and closing operation is continued until the zipper fails or the number of opening and closing times reaches the preset limit. This test can help evaluate the durability and longevity of the zipper.

3. Salt spray test:

This test method is used to evaluate the corrosion resistance of zippers. During the test, the zipper is exposed to a salt spray environment, and then the corrosion of the zipper surface is observed. This test can help evaluate the corrosion resistance of zippers.

4. Thermal cycle test:

This test method is used to evaluate the temperature resistance of zippers. During the test, the zipper is exposed to high and low temperature environments, and then the performance of the zipper changes. This test can help evaluate the high and low temperature resistance of the zipper.

The above are some common zipper test methods. Different test methods can be used in combination with the zipper testing machine according to specific needs to evaluate the performance of the zipper.