Knowledge of static detection of anti-static clean clothes
After dust-free cleaning, the work clothes will be directly used in dust-free workshops of various dust-free levels. In workshops that produce high-precision products, any abnormality in any link may cause damage to the quality of the final product. If the dust particles on the work clothes exceed a certain control range, they will fall into a dust-free environment due to the back and forth of the wearer. These particles may fall to the final product. Clean clothes are an important part of the dust-free environment. It is very important to monitor the link.
ESD test
ESD performance is an important indicator for evaluating the quality of work clothes. General ESD test has four parts: friction voltage test, static voltage test, resistance test, decay time test.
Friction voltage test
This test is mainly to verify whether the fabric itself can reach a specified stable value in a short period of time after it has accumulated some voltage through friction. This is mainly to check the quality of the conductive yarn.
Test method: On a dedicated ESD test bench (grounded), the tester uses a certain force and speed to rub the surface of the cloth several times (usually 5-10 times), and then use the probe of the dedicated voltage tester to be spaced 5cm apart Align the rubbed part left and right, and read the voltage value after 5 seconds.
Test standards, the ESD requirements of clothing in the semiconductor industry generally require less than 100V. Some industries have stricter standards, such as wafer and magnetic head industries, where the friction voltage is generally less than 20V.
Static voltage test
This test is to verify how much the cloth itself can be guided away by the conductive wire after a certain amount of static electricity in the environment and how much it can stay.
*Test method, put the clothes under test on a special test bench, and read the voltage value with the probe of the ESD tester about 5cm apart.
The test standard is determined according to the design standard of the customer's work clothes *strictly, it can be required to be less than 5V. Generally around 50V is more common.