2. Glossary Capacitance: A measure of the ability of a
substance to hold charge. Conductance: The higher the conductance
of a material the easier charge will flow through it. Metals are
very conductive. Electron: A small atomic particle with a negative
charge (1.6 x 1019 coulombs). 2
3. Static When a material or object holds a net electric
charge, either positive or negative, it is said to have a static
charge 3
4. Types of Static Electricity 4 Volumetric Static charge:
imbalance within the body of a material Surface Static Charge: only
present in the outer surface of the material
5. How is Static Created 5 Friction Separation Induction
6. What factors effect Static 6 Type Of Material (Triboelectric
series) Humidity Repetition Battery Effect - Combination of many
charged items lead to high charge Change In Temperature
8. Method of Elimination 8 Movement of Electron through another
material in contact with the surface Humidity Passive Ionization
Anti-Static External Internal
9. 9 Example : Plastic Moulding
10. Introduction 10 Plastic Do not conduct electricity Static
electricity accumulates on the surface Due to the change in temp.
(high to low) during Moulding Charges remain there till it is
neutralized / dissipated This leads to ESA (Dust!!!)
11. Anti-Static 11 Incorporated to the Polymer during
compounding It has limited compatibility with the polymer Migrates
to the surface with passage of time It absorbs moisture from the
atmosphere & makes the surface conductive Due to the available
moisture the surface static charge dissipates
