Primary filter cotton, ceiling filter cotton, and paint arrestor cotton are the three main types of filtration materials used in paint spray booths filter. Workers typically wear protective suits when entering the booth, as the environment contains hazardous gases and large paint particles. Most companies rely on filter cotton and eco-friendly filtration systems to maintain air quality.  

Can Used Primary Filter Cotton Be Cleaned?

Primary filter cotton in paint booths absorbs significant amounts of paint residue, formaldehyde, benzene, and other hazardous substances, classifying it as **hazardous waste** that **should not be cleaned or reused. Disposal must follow hazardous waste regulations.  

However, primary filter cotton installed at the exhaust outlet of an eco-friendly paint booth—where it primarily filters gases rather than wet paint—can be cleaned if no paint sludge is present.  

Replacement Frequency 

- Standard recommendation: Replace every 2–3 months.  

- High-usage paint booths (heavy contamination): Replace monthly (or even every 15 days for intensive use).  

- Exhaust outlet primary filters (gas filtration): Clean or replace every 1–2 months.  

Cleaning Method (Only for Exhaust Filters)

1. Inspect the filter for structural integrity.  

2. Soak & rinse with water or a neutral detergent—avoid scrubbing or twisting.  

3. Air-dry thoroughly before reuse.  

4. Limit washes to 2 times max—each cleaning reduces filtration efficiency by 15%. Repeated washing renders the filter ineffective.  

5. Do not clean in high-precision environments (e.g., cleanrooms).  

Applications of Primary Filter Cotton  

Primarily used for pre-filtration at air inlets filter, it can be framed with metal for easy installation in:  

- Central HVAC systems  

- Paint spray systems  

- Air supply systems  

- High-traffic areas (subways, train stations, etc.)  

Key Note: For paint booths, disposal is safer than cleaning due to toxic contamination. Only exhaust filters under specific conditions are candidates for limited reuse.

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