1 General Provisions
1.0.1 This code is formulated with a view to adapting the requirements of indoor antistatic design of electronic engineering and normalizing the design, control measures and implementation methods of electronic industry construction engineering electrostatic discharge protected area.
1.0.2 This code is applicable to the indoor antistatic design of construction, extension and renovation engineering in electronic industry field.
1.0.3 The design of electrostatic discharge protected area shall comply with the following principles:
1 Estimating objectives for electrostatic control in working area and determining the target values of electrostatic potential control according to the technical requirements of process configuration.
2 Electing economic and effective design scheme according to the construction factors of electrostatic discharge protected area and the service requirements of different electrostatic discharge protected areas.
3 Selecting homologous preventive measures according to quality control elements in electrostatic discharge protected area and conducting system comprehensive design.
1.0.4 In the design of electrostatic discharge protected area, the electrostatic dissipative or conducting electrostatic materials shall be selected, sterling electrostatic grounding system shall be established and the environmental temperature and humidity shall be controlled simultaneously.
1.0.5 The design standard of electrostatic discharge protected area includes three levels. Level I, the absolute value of indoor controlled electrostatic potential shall not be larger than 100V; Level II, the absolute value of indoor controlled electrostatic potential shall not be larger than 200V; Level II, the absolute value of indoor controlled electrostatic potential shall not be larger than 1000V.
The applicable locations for grading standards of electrostatic discharge protected area design may be determined according to Appendix A of this code.
1.0.6 The antistatic design in electronic industry field shall comply with not only this code but also comply with those in the current relevant national standards.
2 Terms
2.0.1 Electrostatic
The electric charge which stays at a relatively stable state but cannot be static. Comparing with field effect, the magnetic field effect caused by electrostatic can be negligible. Electrostatic may be generated by physical processes such as contact and separation of materials, dielectric polarization and adhesion of charged particles.
2.0.2 Electrostatic discharge (ESD)
The phenomenon that the electric charges partially or completely disappear from the charged body due to the medium ionization where the field strength on surface of object with electrostatic is greater than the insulation breakdown field strength of surrounding medium.
2.0.3 Electrostatic harm
The adverse impact on electronic components and instruments caused by electromagnetic radiation or electrostatic induction which are generated by electrostatic discharge.
2.0.4 Corona discharge
The ionic discharge phenomenon with non-uniform electric field and high field strength and accompanied by royal purple fluorescence.
2.0.5 Inner electrostatic potential
The electrostatic potential difference of any object to the earth within the set regional environment.
2.0.6 Electrostatic discharge sensitive (ESDS)
The sensitivity of product performance to the influence or damage caused by electrostatic discharge hereinafter referred to as electrostatic sensitive.
2.0.7 Electrostatic noise
Electromagnetic interference on electronic device and communication facility caused by electromagnetic wave radiation which is generated by electrostatic discharge.
2.0.8 Electrostatic discharge protected area (EPA)
The specific working environment with clear boundary and equipped with various antistatic equipment and materials in which the electrostatic potential is restricted and the electrostatic protection operation is carried out..
2.0.9 Quality control elements in electrostatic discharge protected area
The main environment elements which decides the control effect of inner electrostatic potential, including material and structure form, climate and environmental conditions, grounding, equipment and instrument electrostatic performance, process flow and technical management system.
2.0.10 Electrostatic induction
The redistribution phenomenon of electric charges caused under the influence of electrostatic field.
2.0.11 Electrostatic leakage
The phenomenon of electric charges on charged body partially or completely disappearing through the inside or surface. It is also known as electrostatic discharge.
2.0.12 Shielding
The measure to place the charged body or non-charged body in grounded closed or almost closed metal enclosure or metal grid to restrict the electrostatic field penetrating.
2.0.13 Surface resistance
The ratio of DC voltage applied between two poles with specific form and contacting with the same surface of material to the steady state current flowing through the two poles.
2.0.14 Volume resistance
The ratio of DC voltage applied between two poles with specific form and placed on two opposite surfaces of the material to the steady state current flowing through the two poles.
2.0.15 Surface resistivity
The ratio of the DC electric field strength along the current direction on specimen surface to the density of surface conduction current line per unit length.
2.0.16 Volume resistivity
The ration of the DC electric field strength along the current direction in specimen volume to the current surface density at this point.
2.0.17 Resistance to earth
The resistance of a point on the measured object surface to the earth bonding point or electrostatic grounding device.
2.0.18 Electrostatic half-life
The time required by electrostatic voltage or charges on charged body to drop to the half of the initial value after the external action is removed.
2.0.19 Electrostatic decay time
The time required by electrostatic voltage or charges on charged body to drop to 10% of the initial value after the external action is removed.
2.0.20 Triboelectric voltage
The potential difference between the friction-electrified object surface and the earth.
2.0.21 Grounding
The measures of electrical connection with objects which are able to supply or accept a great deal of electric charges, such as the earth, vessels or delivery vehicle enclosures.
2.0.22 Electrostatic grounding
The measures to electrically connect the metallic conductor to the earth through grounding pole to conduct the electrostatic charges to the earth safely.
2.0.23 Indirect grounding
A kind of grounding method that close connect the entire or partial surface of nonmetal object to a grounded metal body to realize electrostatic grounding.
2.0.24 Soft grounding
The method to limit the current at 5mA (personal safety current) by sufficient resistance grounding.
2.0.25 ESD grounding system
The configured branch system of grounding wire to discharge the electrostatic to the earth, which also known as ESD grounding system and electrostatic grounding system.
2.0.26 Earth bonding point
A dedicated point on the grounding object, which shall be led to the grounding wire configuration system by a grounding lead.
2.0.27 Electrostatic grounding resistance
The sum of resistance from the earth bonding point of antistatic object to the grounding electrode, including the resistance of grounding branch wire, grounding trunk wire and grounding electrode.
2.0.28 Antistatic control worktable
The worktable with electrostatic discharge function and used for the operation of electrostatic sensitive components, parts and equipment.
2.0.29 Electrostatic dissipation
The phenomenon that the electric charges on charged body combine with the internal or external charges of different polarity and cause the disappearing of complete or partial electric charges with electrostatic.
2.0.30 Ionizing static eliminator
The general term of electrostatic eliminator generating positive and negative ions by ionizing the air to neutralize the charges of different polarity on the charged body surface.
Contents
1 General Provisions
2 Terms
3 The Basic Requirements and Design Selections of Antistatic Materials and Products
3.1 The Basic Requirements of Antistatic Materials and Products
3.2 The Design Selections of Antistatic Materials and Products
4 The Design of Indoor Decoration in Electrostatic Discharge Protected Area
4.1 The Design of Floor
4.2 The Design of Ceiling and Wall Surface
4.3 The Design of Door, Window and Other Decoration
5 Electric Design in Electrostatic Discharge Protected Area
6 Grounding System Design in Electrostatic Discharge Protected Area
7 Heating Ventilation and Air Conditioning and Industrial Pipeline Design in Electrostatic Discharge Protected Area
8 The Design Selections of Antistatic Control Worktable
9 The Design Selections of Ionizing Static Eliminator
Appendix A Applicable Location for Design Classification Standard of Electrostatic Discharge Protected Area
Explanation of Wording in This Code
List of Quoted Standards
