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Common ground treatment methods for cleanroom purification projects
2026/7/14
The following are the most common approaches and their key parameters, as well as applicable scenarios:
1. Epoxy self-leveling floor (including anti-static type)
Process: Base surface sanding and leveling → Epoxy primer → Intermediate coating mortar / putty → Solvent-free epoxy self-leveling surface layer (for anti-static models, conductive copper foil needs to be laid + conductive aggregate is added); The entire surface is seamless, with a thickness usually ranging from 1 to 3 mm.
Advantages: The surface is dense and smooth, resistant to acids and alkalis, oil stains, dust, and has controllable static electricity (10⁶ - 10⁹ Ω). The construction period is moderate.
Disadvantages: High requirements for the moisture content and flatness at the base; affected by low temperatures and humid environments during curing; prone to aging under long-term high temperatures.
Applicable to clean areas ranging from 10,000 to 100,000 grade in industries such as electronics, pharmaceuticals, medical devices, and food, especially in process areas with frequent chemical corrosion.
2. PVC anti-static floor sheet/roll
Process: Base treatment (with moisture content < 4% and flatness within 2m ≤ 2mm) → Full application of environmental-friendly conductive adhesive → Sheet laying → Hot air welding of seams (welding strength ≥ 85% of original material) → Arc-shaped edge finishing.
Advantages: Comfortable and elastic foot feel, sound absorption, anti-static property (10⁵ - 10⁸ Ω), rich in colors, easy to replace parts; medical grade with antibacterial properties.
Disadvantages: Less resistant to pressure and impact compared to epoxy; Poorly handled seams are prone to accumulate dirt and grime.
Applicable to: Electronic semiconductor auxiliary areas, laboratories, operating rooms, passageways in dust-free workshops, and areas with high requirements for anti-static properties and foot sensation.
3. Modern terrazzo flooring (with anti-static property, can be embedded with copper strips)
Process: Base leveling → Installation of grounding grid/copper strips (for anti-static) → Layering of cement + quartz stone/marble aggregate → Multiple grinding and polishing → Hydrofluoric acid cleaning → Waxing / Anti-static top coating.
Advantages: Strong overall structure, high compressive strength (≥ 60 MPa), resistant to heavy pressure, long service life, and moderate cost.
Disadvantages: The surface has tiny pores and requires regular waxing maintenance; the construction period is long.
Applicable to: Clean areas of food, cosmetics, and raw material drug production workshops (with cleanliness levels of grade 100 and below), as well as areas with heavy equipment loads.
4. Polyurethane mortar floor
Process: Base treatment → Sealant coating → Polyurethane mortar layer (with added aggregates for reinforcement) → Polyurethane topcoat; Resistant to moisture and temperature fluctuations.
Advantages: Resistant to impact, able to withstand high and low temperatures (-40℃ to 120℃), resistant to water and steam, good slip resistance, suitable for wet areas and scenarios with frequent rinsing.
Disadvantages: The unit price is higher than that of epoxy; the construction process requires strict environmental temperature conditions.
Applicable to: cleaning rooms for food and beverages, disinfection rooms, pharmaceutical freeze-drying workshops, and humid clean areas.
5. Riser floor (raised floor)
Process: Level the concrete base layer → Install adjustable metal supports and crossbeams → Lay anti-static facing floor (such as HPL, PVC); The overhead height is usually 300-600mm, allowing for the installation of pipelines and return air static pressure boxes.
Advantages: Facilitates pipeline maintenance; Can integrate supply and return air; Strong load-bearing capacity; Excellent anti-static performance.
Disadvantages: High initial cost; the mezzanine floor needs to be cleaned regularly to prevent dust accumulation.
Applicable to: Ultra-high cleanliness level (Class 100/Class 10) electronic chip factories, data centers, large laboratories, and areas where pipelines need to be frequently modified.
6. Other auxiliary/special ground facilities
Vinyl ester anti-corrosion floor: More resistant to strong acids and alkalis, and higher temperature than epoxy. It is used in high-corrosion clean areas such as chemical raw material workshops and electroplating workshops.
Static-dissipative rubber flooring: Widely used in clean areas where there are flammable and explosive dust/gases. It combines both anti-static properties and oil resistance.
Key points for model selection: The higher the cleanliness level (100-level/10-level), the more preferred are seamless epoxy or raised flooring; For areas with high humidity or frequent water washing, polyurethane mortar should be selected; For walkways with heavy equipment loads or for areas with heavy equipment usage, terrazzo or thick-layer epoxy mortar flooring should be chosen; For densely populated walkways or operating rooms, PVC rolls should be preferred.
