Clean clothing friction voltage test
In addition to entrusting a third-party testing agency to perform the friction voltage test of the cleanroom clothing, it can also be achieved by itself, but the premise is that an electrostatic field tester is required. The friction voltage value of clean clothes has always been a relatively fancy index for Japanese companies. The current national standard "GB12014-2009" does not elaborate on this index.
The friction voltage test of the dust-free clothing test is mainly to verify whether the fabric itself can reach a specified stable value in a short time after accumulating some voltage through friction. This is mainly to test the quality of the conductive yarn. The friction voltage test of clean clothes is not complicated, the simple test steps are explained below:
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 uses a dedicated voltage tester (electrostatic field test) The probe of the meter/static voltage tester (stopwatch) is aligned with the rubbed part about 5cm apart, and the voltage value after the 5th second is read.
The value of friction voltage will be different depending on the fabric of clean clothes. Generally, the friction voltage of conductive silk fabric is 200V, and the friction voltage of diamond knitted antistatic fabric can reach 30V or less.