Knowledge

What is static electricity? How to prevent?

Post img

What is static electricity? How to prevent?

Static electricity is the imbalance of positive and negative electric charge. When two different materials contact, it will cause the rubbing. The more electrons move, the larger the static charge builds up. On production lines of electronic equipment, electronic components such as ICs will get damaged by such static charges. For static control in work areas, you can use anti-dissipative mats on floors and tables, and have people wear anti-static wrist strap, heel straps. Pro’sKit ESD series will help you to get rid of static electricity problems.

The resistance and decay time of conductor, static control products and insulator

  • Conductor means the materials which have the electrons held loosely and the electrons can move easily, most of metals are good conductor.
  • Static control products means the products designed for static control or elimination to protect electronic components and human body against injury.
  • Insulator means the materials which have the electrons held tightly and the electrons don't move well. Plastic, cloth, glass and dry air are good insulator.

Post img

ESD
Control Item
Product Qualification
Test Method Required Limit(s)
Worksurface ANSI/ESD S 4.1 and or ANSI/ESD STM 4.2 < 1 x 109 Ω and or < 200 volts
Wrist Strap Cord ANSI/ESD S1.1 0.8 x 106 ~ 1.2 x 106 Ω
Wrist Strap Cuff ANSI/ESD S1.1 Interior < 1 x 105 Ω Exterior > 1 x 107 Ω
Wrist Strap Cord Bending Life ANSI/ESD S1.1 > 16,000 times
Foot Grounders ESD SP9.2 < 1 x 109 Ω
Flooring ANSI/ESD S7.1 < 1 x 109 Ω
Mobile Equipment (Working Surfaces) ANSI/ESD S4.1 < 1 x 109 Ω
*This table is quoted from ESD Association standard ANSI/ESD S20.20-2007

ESD products applications

Post img