Moisture Resistant P5 Chipboard is a heavy-duty structural engineered wood panel complying with EN 312 Class P5. Formulated with moisture-repellent melamine-urea-formaldehyde (MUF) resin, hydrophobic paraffin wax emulsion, and an iconic emerald-green core indicator, it is rigorously certified under the EN 321 V313 cyclic test (boiling, freezing, drying) with 24h thickness swelling limited to ≤ 9.5% for humid kitchen carcasses and interlocking T&G mezzanine flooring.
The EN 321 V313 Cyclic Moisture Test
Standard water-repellent boards only pass short-term soaking tests. EN 312 P5 certification mandates the severe EN 321 V313 cyclic accelerated aging protocol: test specimens undergo 3 complete cycles consisting of 3 days water immersion at 20°C, 1 day deep freezing at -12°C to -20°C, and 3 days forced oven drying at 70°C.
Panel Structure, Processing & Applications
Explore panel surfaces, core structures, processing and applications.
1. Green-Core Panels
2. Tongue-and-Groove Joint
3. Mezzanine Flooring
4. Particle Board Core
Comprehensive Technical Data Sheet (EN 312 Class P5 vs. Cuzi Mill Values)
Certified mechanical values across thicknesses for structural humid-use load-bearing applications.
| Physical & Mechanical Property | Testing Standard | Units | 10 mm – 13 mm | >13 mm – 20 mm (18mm) | >20 mm – 25 mm (22mm) | >25 mm – 38 mm (38mm) |
|---|---|---|---|---|---|---|
| Nominal Density | EN 323 / ASTM D1037 | kg/m³ | 700 – 740 | 680 – 710 | 670 – 700 | 650 – 680 |
| Bending Strength (MOR) | EN 310 | N/mm² | ≥ 18.0 (Cuzi: 20.5) | ≥ 16.0 (Cuzi: 18.5) | ≥ 14.0 (Cuzi: 16.5) | ≥ 11.5 (Cuzi: 14.0) |
| Modulus of Elasticity (MOE) | EN 310 | N/mm² | ≥ 2550 (Cuzi: 2900) | ≥ 2400 (Cuzi: 2750) | ≥ 2150 (Cuzi: 2500) | ≥ 1900 (Cuzi: 2250) |
| Initial Internal Bond (IB) | EN 319 | N/mm² | ≥ 0.45 (Cuzi: 0.58) | ≥ 0.45 (Cuzi: 0.55) | ≥ 0.40 (Cuzi: 0.50) | ≥ 0.30 (Cuzi: 0.42) |
| Post-V313 Residual Bond (IB) | EN 321 / EN 319 | N/mm² | ≥ 0.15 (Cuzi: 0.24) | ≥ 0.15 (Cuzi: 0.22) | ≥ 0.14 (Cuzi: 0.20) | ≥ 0.11 (Cuzi: 0.17) |
| 24-Hour Thickness Swelling | EN 317 | % | ≤ 11.0% (Cuzi: 8.5%) | ≤ 10.0% (Cuzi: 8.0%) | ≤ 10.0% (Cuzi: 8.2%) | ≤ 9.0% (Cuzi: 7.5%) |
| Post-V313 Thickness Swelling | EN 321 / EN 317 | % | ≤ 12.0% (Cuzi: 9.8%) | ≤ 11.0% (Cuzi: 9.2%) | ≤ 11.0% (Cuzi: 9.0%) | ≤ 10.0% (Cuzi: 8.5%) |
| Face Screw Holding Resistance | EN 320 / ASTM D1037 | N | ≥ 1050 N (Cuzi: 1250 N) | ≥ 1150 N (Cuzi: 1350 N) | ≥ 1200 N (Cuzi: 1400 N) | ≥ 1200 N (Cuzi: 1380 N) |
| Edge Screw Holding Resistance | EN 320 / ASTM D1037 | N | Not applicable | ≥ 800 N (Cuzi: 980 N) | ≥ 850 N (Cuzi: 1050 N) | ≥ 900 N (Cuzi: 1100 N) |
| Formaldehyde Emission (Chamber) | ASTM E1333 / EN 717-1 | ppm | < 0.05 (CARB P2) | < 0.05 (CARB P2) | < 0.05 (CARB P2) | < 0.05 (CARB P2) |
1. Squeak-Free 4-Sided T&G Installation
When installing 2400×600mm T&G panels over steel or timber joists, follow our structural installation protocol:
- Continuous Adhesive Bead in Grooves: Apply a continuous bead of D4 waterproof polyurethane glue into both the long and short grooves before interlocking.
- Joist Span Centers: 18mm P5 on 400mm centers; 22mm P5 on 600mm centers (supporting 5.0 kN/m² design load); 38mm on 800–1000mm centers.
- Mechanical Fixing Centers: Annular ring-shank nails or coarse-thread flooring screws at 150mm centers along perimeter joists and 300mm centers on intermediate joists.
- Expansion Clearance: Maintain a minimum 10mm to 12mm expansion perimeter gap around masonry walls and steel columns.
2. Kitchen & Bathroom Carcass Engineering
Why leading European kitchen cabinet makers specify P5 green-core panels for high-risk humidity zones:
- Under-Sink Carcass Boxes: Eliminates catastrophic board swelling and delamination caused by slow plumbing pipe drips.
- Dishwasher & Oven Surrounds: Resists continuous warm steam cycles without expanding or popping edge tape.
- PUR Edge Banding Synergy: Combining P5 green-core chipboard with waterproof reactive polyurethane (PUR) edge banding creates a completely sealed moisture barrier.
P5 Moisture Resistant Chipboard Container Loading Data
Pallet packing specifications for 4×8 ft standard sheets and 2400×600mm 4-sided T&G flooring panels.
| Profile & Format | Thickness | Sheets / Pallet | 20'GP Payload | 40'HQ Payload | Net Timber Volume (40'HQ) | Gross Weight (40'HQ) |
|---|---|---|---|---|---|---|
| 4×8 ft Standard (Square Edge) | 18 mm | 55 Sheets | 8 Pallets (440 Sheets) | 16 Pallets (880 Sheets) | 47.15 m³ | ~26.9 Metric Tons |
| 4×8 ft Standard (Square Edge) | 22 mm | 45 Sheets | 8 Pallets (360 Sheets) | 16 Pallets (720 Sheets) | 47.15 m³ | ~26.8 Metric Tons |
| 2400 × 600 mm (4-Side T&G Flooring) | 18 mm | 50 Sheets | 14 Pallets (700 Sheets) | 28 Pallets (1,400 Sheets) | 36.28 m³ | ~25.5 Metric Tons |
| 2400 × 600 mm (4-Side T&G Flooring) | 22 mm | 42 Sheets | 14 Pallets (588 Sheets) | 28 Pallets (1,176 Sheets) | 37.25 m³ | ~26.2 Metric Tons |
| 2400 × 600 mm (Heavy Mezzanine T&G) | 38 mm | 24 Sheets | 14 Pallets (336 Sheets) | 28 Pallets (672 Sheets) | 36.76 m³ | ~25.8 Metric Tons |