Should the anti-static sponge be measured with a surface resistance tester or an electrostatic field meter
The guest said: Our company is using anti-static sponge to package products, and then put them into cartons. I have two questions I would like to understand.
1. Should the anti-static sponge be measured with a surface resistance tester or an electrostatic field meter?
2. If the anti-static sponge is tested using an electrostatic field tester. So before I measure, do I need to rub it on the anti-static sponge before testing?
Our reply: If you need to verify the antistatic performance of the sponge, it is correct to use both the surface resistance tester and the electrostatic field tester.
ANSI/ESD S20.20 puts forward requirements for anti-static turnover and packaging materials. The surface resistance is required to be kept at 10 5 —— ≤10 9 Ω. The frictional voltage is required to be kept at <100V. Sampling inspections are required every month.
When measuring surface resistance, use a surface resistance tester to test directly.
It is recommended to use a non-contact electrostatic field tester to measure the friction voltage. Before the measurement, hold a dry cloth or plastic bag, with a frequency of about 120 times/min, apply appropriate pressure with the palm, and rub a certain part of the tested part 20 times in one direction. Then according to the use method of the electrostatic field tester, that is, close to the friction part, observe the display value of the meter. Repeat the test 5 times to get the average value.