Metal zippers belong to a type of zipper, which refers to the zipper made of copper, white copper, or aluminum material. Compared to nylon zippers and resin zippers, they are more sturdy and are often used on jeans, coats, and backpacks The basic standards for metal zippers are as follows:

1. The entire zipper component is complete, the chain teeth are arranged neatly, and there must be no missing or damaged teeth 2. The bottom stop of the zipper should not be significantly skewed, and there should be no jamming of the pull head when opening or closing 3. The tail zipper (including the double tail zipper) can be inserted, pulled out, and started flexibly; Strengthen the adhesion of adhesive tape and cloth tape firmly and neatly 3. The surface decoration layer of the zipper head (also known as the pull head) is firm, uniform, and consistent, without defects such as bubbles or peeling, and the mold cavity is flat and smooth; Flexible flipping of the tab and clear trademark The zipper size parameters shall comply with the provisions of Article 3.3; The length of each hundred meters of the packaging is 100m ± 0.5m. The color of the chain strap is bright, and the color difference of the chain strap in the same batch number reaches the third level specified in GB250. The color difference of the same chain belt should reach the fourth level specified in GB250

Color fastness of metal zippers: Resistance to friction Color fastness: After the friction test, the color fastness of the chain belt meets the requirements of GB251 level 3-4

Color fastness to washing: After washing, the color fastness of the chain strap meets the 3-4 levels specified in GB250

The number of joints per hundred meters of length of the chain strap should not exceed 3

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms

3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

100% inspection and testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Testing and testing characteristics:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

4. Free initial testing, with no testing fees charged

5. Self service order delivery for free on-site sampling

6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China