PU Coating
Nature — What Is PU Coating?
PU Coating is a polyurethane layer applied to fabric to enhance waterproofness, durability, and structural stability.
It is commonly used in rainwear, bags, technical textiles, and performance outerwear.
Scientific Structure (Explained Clearly)
PU (polyurethane) coating is applied as a liquid layer to the inner side of a fabric and cured to form a flexible, water-resistant barrier. Thickness and formulation determine waterproof level and flexibility.
Structural Characteristics
- Polyurethane coating layer
- Applied to fabric back side
- Cured flexible polymer film
- Can be single or multi-layer applied
Fabric Quality Impact
- Improves hydrostatic head rating
- Enhances structural rigidity
- Can reduce breathability
- Thickness affects flexibility and weight
Performance — How PU Coating Behaves
1. Water Resistance
Provides measurable waterproof performance depending on coating thickness.
2. Flexibility
High-quality PU remains flexible without cracking under movement.
3. Durability
Resists abrasion and wear when properly formulated.
4. Breathability Trade-Off
Solid PU coatings may reduce vapor transmission compared to membranes.
Reality — What Customers Should Know
Advantages
- Cost-effective waterproof solution
- Flexible and lightweight compared to PVC
- Widely used in technical applications
- Can achieve high hydrostatic ratings
Limitations
- May degrade over time with hydrolysis
- Lower breathability than membrane systems
- Performance depends on coating quality
- Can stiffen fabric if heavily applied
Buying tip: Check hydrostatic head rating and confirm whether PU is microporous or solid for breathability expectations.