The fundamental distinction lies in the surface treatment applied to the air-inlet side of the cooling paper:
Unpainted (Plain) Cooling Pads: Made from high-quality kraft paper treated with specialized resins. The original brown or natural paper surface is fully exposed on both sides.
Painted (Black/Green Coated) Cooling Pads: Feature an additional protective polymer or acrylic coating cured onto the outer layer (air-inlet surface). This coating is commonly black or dark green.
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Comparison: Key Performance Factors
To help you make an informed decision, here is how the two types perform across essential operating parameters:
| Feature | Unpainted Cooling Pads | Painted (Coated) Cooling Pads |
| Algae & Mold Resistance | Moderate (Requires water treatment) | Superior (Coating prevents penetration) |
| Cleaning & Maintenance | High care needed (Soft brush only) | Easy (Can be pressure washed gently) |
| UV & Weather Resistance | Standard | High (Protected against sun degradation) |
| Lifespan | 3 to 5 years | 5 to 8+ years |
| Initial Cost | Lower / Budget-friendly | Slightly higher initial investment |
Advantages of Unpainted Cooling Pads
Cost-Effective Initial Investment: Ideal for large-scale agricultural projects with strict budget constraints.
High Initial Absorbency: The untreated surface allows for instant water absorption and rapid cooling efficiency upon installation.
Sufficient for Indoor or Mild Environments: Performs reliably in areas with clean water supplies and minimal direct exposure to harsh sunlight or high dust levels.
Advantages of Painted (Coated) Cooling Pads
Enhanced Durability & Hardness: The protective coating hardens the outer face of the pad, shielding it from physical damage caused by hail, birds, and cleaning equipment.
Easy Cleaning & Pressure Washing: Unlike soft, untreated paper, the cured outer layer allows operators to wash off dust, algae, and minerals without damaging the paper structure.
Superior UV Protection: The dark coating absorbs ultraviolet rays, preventing the kraft paper from breaking down prematurely under direct sunlight.
Algae Resistance: Algae cannot easily anchor itself to the smooth polymer coating, drastically reducing maintenance downtime and chemical usage.
Which One Should You Choose?
Choose Unpainted Cooling Pads if: You are working within a tight budget, operating in low-dust regions, using water treatment systems, or installing pads indoors/under protective eaves.
Choose Painted Cooling Pads if: You operate in high-humidity, high-heat, or dust-prone regions, need long-term durability, or want to minimize ongoing maintenance labor.
Need expert advice on choosing the right cooling pad thickness, angle, and dimensions for your ventilation system? Contact our engineering team today for custom technical support and direct factory quotations.