The core of anti-static decoration in cleanroom facilities lies in controlling static leakage, suppressing static generation, and ensuring reliable grounding, all while balancing cleanliness with electrostatic safety. It mainly encompasses three major parts: anti-static flooring, walls/ceilings/doors & windows, and anti-static grounding.
1. Anti-static Flooring
Anti-static flooring is of the static dissipative type, with a surface resistivity of 1×10⁸～1×10¹²Ω and a volume resistivity of 1×10⁴～1×10⁹Ω. Common types include veneer flooring, raised access floors, resin self-leveling floors, and terrazzo.
(1) Veneer Flooring: Composed of the base floor, primer, conductive layer, and surface layer. The base layer must have a moisture content ≤8% and strength ≥C30. The conductive layer uses 10–20mm wide copper foil in a 600mm×600mm grid (1200mm×1200mm for rolls), with at least 2 grounding exit points, spaced ≤25m apart.
(2) Anti-static Raised Access Floor: Divided into perimeter or quad-support types. The system resistance is <1×10⁶Ω for conductive types and 1×10⁶～1×10¹⁰Ω for static dissipative types. Insulation pads are installed at the bottom of the supports. Grounding branches use ≥1.5mm² multi-strand copper wires, meeting SJ/T10796 requirements.
(3) Resin Self-leveling Flooring: Total thickness ≥2mm, with a surface layer ≥0.8mm. The conductive layer structure is the same as veneer flooring. Material performance must comply with SJ/T11294. It is seamless, easy to clean, and adaptable to clean areas.
2. Walls, Ceilings, Doors, and Windows
Implementation is graded according to Class I, Class II, and Class III anti-static work areas. The core is to control surface resistance, friction-induced charging voltage, and electrostatic half-life.
(1) Class I: Floors, walls, and columns use conductive types. Surface-to-ground resistance is 2.5×10⁴～1×10⁶Ω, friction-induced voltage ≤100V, and half-life ≤0.1s. Walls are equipped with a conductive layer, with copper foil arranged in a cross pattern. Each room requires at least 4 grounding points spaced ≤18m apart.
(2) Class II: Uses static dissipative types. Resistance is 1×10⁶～1×10¹²Ω, friction-induced voltage ≤200V, and half-life ≤1s. Walls can be coated with anti-static coatings; metal frameworks must be grounded.
(3) Class III: Should use static dissipative or low-charging materials. Friction-induced voltage ≤1000V.
Doors and Windows: For Class I and II, use static dissipative materials or veneers. Metal doors and windows must be coated with a dissipative coating and grounded. Partitions and observation windows should be applied with dissipative static films. HVAC vents and ducts should use conductive materials or undergo anti-static treatment with reliable grounding connections.
Environment: Ambient temperature and humidity should be controlled at 18–28℃ and 45%–65% relative humidity.
3. Anti-static Grounding
Anti-static grounding adopts equipotential bonding, prioritizing a combined grounding system. For separate grounding, the resistance should be ≤10Ω, with a distance of ≥20m from lightning protection grounding. The system consists of grounding bodies, trunk lines, branch lines, terminal boards, and closed copper busbar rings. Metal structures, doors, windows, ceiling frameworks, equipment, and pipelines in the cleanroom must be reliably grounded with no isolated conductors. Grounding points for air ducts and pipelines should be spaced ≤30m apart, with metal mesh bridges added across insulated sections. Human body grounding must be connected in series with a 1MΩ current-limiting resistor to ensure safety.
Suzhou Pharma Machinery Co.,Ltd.
2026/06/01
Icey
