Liberty Intercept Blog

20 Definitions on Electrostatic Discharge - ESD Month- Part 2

Posted by Joe Spitz on Feb 18, 2014 2:29:00 PM

Electrostatic dischargeEven if you are an electrical engineer and these are elementary terms from your high school and college days, it may be fruitful to review their meanings and logic to see if you currently have sufficient packaging to protect your company’s products and assets.  

On more than one occasion, I’ve had to explain that antistatic pink poly bags, which an organization assumes is adequate protection, WILL NOT drain a charge to ground nor will they dissipate a charge. That is not the definition of antistatic properties as seen below. Pink poly is designed only to prevent tribocharging with itself; to be frank, not a whole lot of protection.

These definitions were taken directly from the book ESD Program Management authored by ESD expert,Ted Dangelmayer. 

Electron - A negatively charge particle.

Charge - An excess or deficiency of electrons on the surface of a material.

Static Electricity - Electrical charge at rest.

Potential and Electrostatic Potential - Stored energy that is able to do work. Electrostatic potential difference between a point and an agreed upon reference.

Ground - A metallic connection with the earth to establish zero potential or voltage with respect to the ground or earth.  It is the voltage reference point in a circuit.

Electrostatic Discharge (ESD) - The sudden transfer of electrostatic charge between bodies of different electrostatic potentials.

Electrical Overstress (EOS) - The electrical stressing of items beyond their specifications; may be due to ESD and/or corrosion. All ESD damage is EOS.

Capacitance - The ability of an object to store a charge.

Insulator - A material that does not conduct electricity.  Also known at “dielectric” material.

Dielectric breakdown - A threshold effect in the dielectric medium where at some electric field strength across the medium, bound electrons become unbound and travel through the medium as a current.

Triboelectric and Triboelectric Charging - The term referring to a static charge generated by friction or the separation of materials. The generation of electrostatic charges when two pieces of material in intimate contact are separated (where one or both are an insulator).  Substantial generation of static electricity can be caused by contact and separation of two materials or by rubbing two substances together.

Resistance -  The degree of “difficulty” that an electrical current encounters in passing through a circuit or conductor.  Resistance is measured in ohms and is a property of conductors that is determined by conductor dimensions, materials, and temperature.  The resistance of a material determines the current produced by a voltage.

Ohms per Square - A unit of surface resistance.  The size of the square is immaterial when testing.

Conductive - A property of materials which are either metal or impregnated with metal, carbon particles, or other conductive materials, or whose surface has been treated with such materials through a process of lacquering, plating, metalizing, or printing.  A conductive material for static control purposes shall have a surface resistivity less than 1x105 ohms/square or 1x104 ohm-cm if volume conductive.  A conductive material in not necessarily antistatic.

Dissipative - Material exhibiting a surface resistance of 105 to 1011 ohms per square.  Dissipative materials bleed off charges at an optimal rate, neither to fast or too slow.

Voltage Suppression - A phenomenon where the voltage from a charged object is reduced by increasing the capacitance of the object rather than decreasing the charge on the object.

Antistatic - A property of materials that resist triboelectric charging and produce minimal static charge when separated from themselves or other materials.

Insulative Material - A material having a surface resistivity of at least 1x1012 ohms/square volume resistivity

Human Body Model (HBM) - A circuit that simulates the ESD from a person for testing purposes.

Charge-Devise Model (CDM) - A model characterizing and ESD in which a device isolated from ground is charged and then suddenly discharged.

The ESD protective packaging materials that Liberty Packaging represents, Static Intercept and AT, protect by being antistatic, dissipative, and by employing the voltage suppression technique. Static Intercept will also protect against corrosion to help with EOS problems.  Both AT and Static Intercept are reusable and recyclable materials - good for both the environment and your bottom line.

View Intercept Video

Check out our ESD Video:

ESD Video

Intercept Technology Packaging products fit within a sustainability strategy because they are reusable, recyclable, do not contain or use volatile components (No VOCs, Not a VCI) and leave a smaller carbon footprint than most traditional protective packaging products.  

Topics: industrial packaging, ESD, electronics packaging

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