What exactly are PU stone wall panels made of?
PU stone wall panels, also known as polyurethane stone wall panels, are composite decorative materials primarily composed of the following components:
1. Core Material - Polyurethane (PU)
High-density rigid PU foam forms the structural base, providing:
Ultra-lightweight properties (1/10 the weight of natural stone)
Thermal insulation (thermal conductivity 0.022-0.033 W/m·K)
Impact resistance (compressive strength ≥150kPa)
2. Surface Layer
UV-resistant coating: Acrylic or fluorocarbon finish with:
20+ years color retention (QUV accelerated weathering test ≥4000hrs)
Self-cleaning nano-coating options
Stone texture replication: 3D molding technology achieves 95%+ similarity to natural stone patterns like:
Sandstone
Slate
Granite
Limestone
3. Reinforcement Layer
Fiberglass mesh embedding (160-300g/m² density) enhances:
Tensile strength (≥150N/cm width)
Dimensional stability (thermal expansion coefficient ≤5×10⁻⁵/℃)
4. Fireproof Layer (Optional)
Aluminum hydroxide flame retardant added to meet:
ASTM E84 Class A (flame spread index <25)
EN13501-1 Euroclass B-s1,d0
5. Edge Treatment
Tongue-and-groove system with:
±0.3mm dimensional tolerance
IPX7 waterproof rating joint design
These engineered components enable PU panels to achieve 85% weight reduction compared to natural stone while maintaining comparable aesthetic performance, with typical panel specifications:
Thickness: 10-30mm
Panel size: 600-1200mm × 2400-3000mm
Service temperature: -50℃ to +80℃