Dust-free coveralls must be regularly tested for anti-static properties
The dust-free coveralls worn by workers in the clean room should have good anti-static properties, and their anti-static properties are also important. Because the anti-static performance is good, the clothes are not easy to vacuum.
In electronic operation, static electricity can damage tiny circuits. When people move in the clean room, their dust-free coveralls will rub against the seats, the workbench, and the underwear and skin worn inside, creating static electricity on the outer dust-free coveralls. This static electricity is released to the integrated circuit and destroyed. Therefore, in the production of a dust-free clothing fabric, the fabric is woven with continuous conductive fibers made of a conductive material.
When choosing a garment with the lowest electrostatic discharge in a dust-free coverall, the following tests can be performed:
Another way to measure the antistatic properties of a fabric is to observe the decay time of the static electricity on the fabric. This method is better than measuring conductivity. A charge of known voltage is first generated on the fabric and then the time required for the voltage to drop to 1/2 or 1/10 of its original value is measured. This time can vary from less than 0.1 seconds to more than 10 minutes. The shorter the time, the better the anti-static effect of the fabric.
Measure resistivity or conductivity; measure voltage attenuation; measure the voltage generated by a person wearing a clean suit. There are several ways to test the surface resistivity of a fabric. The lower the resistance, the better the fabric, because the lower the resistivity, the easier the static electricity is to conduct.