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Why do esd materials need to be plastic instead of metal

May 23, 2018

Why do esd materials need to be plastic instead of metal?

 

Metals can conduct away static electricity, but the following issues apply to ESD protection materials:
First, it may be due to leakage of electricity, so that operators inadvertently contact with high pressure or hard ground when prone to personal injury accidents;
Second, if there is an electrostatic product close to it, because the metal is a good conductor, electrostatic discharge is very easy to occur at this time, and its energy is released quickly. The discharge spark and electromagnetic noise that occur will cause great damage to the components; When working on a metal table, the connecting wires of the device or the printed board may cause a short circuit due to contact with the conductive surface of the metal, resulting in damage. Therefore, the static dissipative material is generally an electrostatic dissipative material with a surface resistivity of 10 ≤ <10 Ω/sq or a volume resistivity of 10 Ω.cm ≤ <10 Ω.cm, and the static electricity and static electricity accumulated on the static dissipative material are in the range of static electricity. Between the conductor and the electrostatic insulator.