According to the ESDA Association (ESDA) standard, the difference between conductive materials, electrostatic dissipative materials and insulating materials is primarily in their resistivity/resistance and the resulting electrostatic charge dissipation capability.
We can understand this with a simple analogy: Imagine three different ways of flowing water.
Conductive material → Wide metal pipe: water (current) can pass through very quickly and almost without resistance.
Electrostatic dissipating material→ rubber water pipe with moderate friction: water flow (current) can be stable and controllable.
Insulating material → A completely blocked pipe: no water (current) can pass through.
The key distinction lies in the surface or volume resistivity of materials.
Conductive materials have a surface or volume resistivity below 1×10⁴ (less than 10,000 Ω).
Electrostatic dissipative materials exhibit a surface or volume resistivity ranging from 1×10⁴ to <1×10¹¹ (10,000 Ω to 100 billion Ω), while insulating materials possess a resistivity ≥ 1×10¹¹ (greater than or equal to 100 billion Ω)
1. Conductive materials
The core feature of conductive materials is that the resistance is very low, providing a path for the flow of static charge with almost no obstruction.
This feature can discharge the static charge to the ground extremely quickly (typically <0.1 seconds). Therefore, it is mainly used in situations where the static charge needs to be removed quickly and must be reliably grounded.
Conductive materials are often used in antistatic floors, work surfaces, handling boxes, tool handles, wristbands, etc.
At the same time, due to the rapid charge dissipation of conductive materials, direct contact with highly sensitive electronic components (such as IC chips) may lead to instantaneous high current discharge, which may damage the components (this damage is called CDM, charging device model). Therefore, it is generally not directly used in the packaging or padding of precision components.
2. Electrostatic dissipative materials
The core characteristic of electrostatic dissipative materials is that the resistance value is between conductive and insulating, allowing the static charge to flow to the ground at a controlled, relatively slow speed.
Static dissipative materials are the ideal choice for protecting most electrostatic sensitive (ESDS) components. They not only effectively prevent the accumulation of static electricity, but also prevent destructive peak currents caused by excessive discharge speed, achieving "safe discharge".
It is often used for IC trays and slots, anti-static packaging bags, workbench pads, silicone foam gaskets/clamps, assembly workbench surfaces, etc.
Performance indicators: Typically require the ability to safely attenuate a static voltage of 5000 volts to zero in less than 0.1 seconds.
3. Insulation materials
The core property of an insulating material is that it has a very high resistance and is essentially non-conductive, so that static charge cannot flow effectively on or within its surface.
Role in ESD protection: Insulating materials are strictly restricted or prohibited in EPA (Electrostatic Protection Area). Because once a charge is generated (e.g., through friction, separation), it remains on the surface of the insulator for a long time.
When the charged insulation material is close to a grounded conductor or sensitive element, it will cause rapid arc discharge, which is easy to cause fatal damage to electronic products.
Common insulating materials are ordinary plastic bottles, foam polystyrene (polystyrene), ordinary plastic bags, untreated ordinary plastics and rubber.
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