An ESD floor (Electrostatic Discharge floor) is a floor that is conductive enough to drain static electricity slowly and in a controlled way. This prevents sudden discharges that can damage electronics or trigger explosions. ESD floors are installed where sensitive equipment or explosive gases are present.
Why an ESD floor?
Friction — for instance walking with shoes on a normal floor — can build up electrical charge. On contact, this discharges suddenly. To people it feels like a small shock, but for:
- Electronics — an ESD pulse can destroy chips, sometimes invisibly
- Explosive gases — a spark can trigger an explosion
- Munitions and pyrotechnics — similar risk
An ESD floor drains charge gradually to earth, preventing build-up.
Types of ESD floor
| Type | Material | Conductivity |
|---|---|---|
| Dissipative floor | PVC, linoleum, resin floor with conductive fibres | 10⁶ – 10⁹ ohms |
| Conductive floor | Highly conductive epoxy or vinyl | 10⁴ – 10⁶ ohms |
| Antistatic carpet | With conductive fibres | Limited effect |
The choice depends on the working environment requirements. ESD requirements are set out in standards such as IEC 61340 and ANSI/ESD S20.20.
Construction
An ESD floor consists of:
- Conductive substrate — usually a copper earthing grid below the top layer
- Conductive adhesive — connects the top layer to the earthing grid
- ESD top layer — vinyl, rubber or epoxy with conductive fibres or particles
- Earth connection — link to the building earth
Operators usually wear ESD shoes or wristbands so their body is also conductively connected to the floor.
Applications
- Electronics assembly — chip and PCB production
- Data centres — server rooms and magnetic storage
- Operating theatres — anaesthetic gases were once explosive
- Munitions factories — when handling explosive material
- Gas, oil and chemical industry — ATEX zones
- Cleanrooms — controlled production environments
Maintenance
- Specific cleaning products — ordinary wax disrupts conductivity
- Periodic measurement — check resistance with a multimeter
- Conductive shoes — must also be tested periodically
Related terms
- Antistatic floor
- Resin floor
- Industrial floor
- ATEX zone
- Earth electrode
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