How to Reduce Static Electricity in a Cleanroom
Reducing static electricity in a cleanroom requires systematic protective measures, primarily encompassing the following four areas:
⚡ 1. Environmental and Material Control
Humidity Control: Maintain a relative humidity of 40%-65% (the electronics industry recommends 45%-65%), using humidifiers to reduce static electricity.
Application of Anti-Static Materials:
Flooring: Use conductive epoxy flooring, PVC anti-static flooring, or a conductive coating. Surface resistance should be controlled within 10⁴–10⁹Ω.
Walls/Ceiling: Use anti-static paint or conductive sheeting to create a complete static dissipative layer.
Workbench: Use anti-static mats or grounded metal surfaces.
🛠️ 2. Equipment and Grounding Management
Comprehensive Grounding System:
All metal equipment casings, workbenches, shelves, etc. must be reliably grounded. Grounding resistance is categorized by region:
General areas: ≤4Ω
Explosion-proof/highly sensitive areas: ≤1Ω
Use multi-strand copper wire with a cross-sectional area ≥6mm² for the grounding wire. Do not twist or connect the wires.
Static Elimination Equipment:
Install ionizers and ionizers to neutralize static electricity in the air.
Equip key workstations with static elimination guns/eliminators.
3. Personnel Protection Standards
Electrostatic Dissipation Equipment:
One-piece anti-static coveralls, conductive shoes/shoe covers, and a grounding wrist strap (connected in series with a 1MΩ current-limiting resistor).
Operational Procedure Control:
Before entering the workshop, discharge static electricity from your body through the static elimination access control system (by touching a conductive surface).
Conduct regular anti-static safety training.