ESD protective equipment, equipment and its use
In order to prevent electrostatic hazards, people have developed a variety of ESD protective products and equipment, also called anti-static products and equipment, which are used in the electronic production environment. Due to the wide variety of ESD protection products, the performance is different. In order to achieve better results, its performance is now described in detail as follows:
1, human body ESD protection products
There are roughly 6 kinds of ESD protection products for human body.
(1) ESD protective work clothes (also called anti-static work clothes)
ESD protective clothing is made of conductive fibers. When rubbing against other objects, the static electricity generated will leak through the contact between conductive fibers and the human body or through corona discharge and diffusion between conductive fibers. So as to prevent the accumulation of static electricity.
There are three types of materials and conductive fibers used in ESD protective clothing:
A. Metal fiber clothing: clothing made of blended stainless steel wire and cotton with a diameter of 8-50 microns.
B, carburizing (or metal) clothing: spraying and electroplating conductive materials (conductive carbon black, metal powder) on the surface of synthetic fibers.
C. Conductive synthetic fiber clothing: Conductive materials are mixed into synthetic fibers.
There are the following requirements for the design and use of ESD protective clothing:
Non-anti-static fabric is generally not used as lining. When it must be used, the lining used shall not exceed 20% of the total lining area.
The whole garment shall not use any metal accessories. When it must be used, it should not be exposed directly to the surface of the garment, and the metal should discharge on the same side.
When wearing ESD protective clothing, it must be used in conjunction with ESD protective shoes (anti-static shoes).
The ESD protective clothing passed by the national standard shall be re-inspected every other year. When the charged amount exceeds the above-mentioned specified value, it shall not be used.
Pure cotton clothing cannot prevent static electricity from accumulating in an environment where the relative humidity is lower than 40%, so it is not suitable for ESD protective clothing.