OSB4

OSB 4 Board (Oriented Strand Board Four）

Product ID: OSB4-OSB 4 Board (Oriented Strand Board Four）

OSB 4, also known as “Oriented Strand Board/4” or “Moisture-Resistant Heavy-Duty OSB,” is the highest-performance heavy-duty structural engineered wood panel under European Standard EN 300. It is manufactured by bonding multiple layers of wood strips in specific orientations using adhesive (high-proportion phenolic/MDI glue) under high temperature and pressure.

Compared to OSB/3, OSB/4 panels are around 30-50% MOE and MOR than OSB/3 panels, with 15%-20% lower thickness swelling. It can take heavier loads, leave more space between panels and is stronger and more stable. It is used in many situations where it is important that it works well, such as designing large roofs or high-performance flooring systems, industrial shelving, mezzanine floors, buildings in heavy snow regions, flanges of engineered I-beams, and important structural parts of tall wooden buildings.

Features ＆ Advantages

♦Good dimensional stability

♦Wide range of applications

♦Excellent heavy-load capacity

♦Provides a Decisive Safety Margin

♦Uniform and free of internal defects

♦Top-Tier Performance in Humid Conditions

OSB 4 Specifications

OSB/4 panels are available in a wide range of sizes, thicknesses, adhesive types and core materials. They are very strong when bent or pulled, which means they can be used to support bigger loads. Compared to OSB/3, they don’t expand as much when they get wet and are more stable in size. This makes them perfect for projects where it’s humid and you need something strong.

Product Name	OSB/4 – Exterior Heavy-Duty Load-Bearing Boards for Damp Conditions
Other Names	OSB 4、Oriented Strand Board Type 4、enhanced moisture resistance OSB、OSB grade 4、exterior damp high load OSB panel、Oriented Strand Board 4、Heavy-Duty Load-Bearing OSB、Structural Plus OSB+、Exposure 2 Rated OSB
Wood Species	Poplar、Pine（Full Pine、Radiata Pine、Masson Pine、Mixed Pine）、Eucalyptus、Poplar-Eucalyptus Mix、Mixed Hardwood
Glue	High proportion PF (Phenolic)/MDI Glue – E0 Grade
Size	Commonly used: 1220x2440mm (4’x8′),Others: 610 mm x 1220 mm (2’x4′),915 mm x 1830 mm (3’x6′), 1220×2745 mm (4’x9′),1220x3050mm (4’x10′) 1250x2500mm (4.1’x8.2′), 2440x2440mm (8’x8′), 2440x7320mm(8’x24′),Upon To Request
Thickness	6mm-25mm, regular sizes: 6 (1/4″), 7 (9/32″), 8 (5/16″), 9 (3/8″), 11 (7/16″), 12 (15/32″), 15 (19/32″), 16 (5/8″), 18 (11/16″), 22 (7/8″), 25 (1″) mm, customizable upon request
Production Line Type	Continuous Flat Press Line(Dieffenbacher)
Surface Finish	Standard Unsanded Optional: Single-sided/Double-sided Sanded
Edge Profile	Square Edge (SE): Used for walls and roofs Tongue & Groove (T&G): Used for floors and applications requiring splicing (2- or 4-side tongue and groove)
Moisture Content	5 – 9%
Density	640 – 700 kg/m³
Panel Marking	Inkjet printing: Brand logo, grade, thickness, production date, environmental rating Spindle direction indicator arrow (for correct installation)
Edge Sealing	Yes (usually with green, red or blue waterproof paint to reduce moisture intrusion during transport and storage)
Tolerance	Thickness Tolerance:±0.5mm (unsanded) / ±0.3mm (sanded) Length/Width Tolerance:± 1.5mm Squareness Tolerance:≤ 2.0 mm/m
Modulus of Rupture – MOR	Major Axis: ≥ 32 MPa Minor Axis: ≥ 16 MPa (Values based on thicknesses of 10-18 mm)
Internal Bond Strength – IB	≥ 0.42 MPa
Modulus of Elasticity – MOE	Major Axis: ≥ 5000 MPa Minor Axis: ≥ 1900 MPa (Values based on thicknesses of 10-18mm)
Swelling in thickness – 24h	≤ 10%
Fire Rating	Can be treated to EN 13501-1 Class B or C
MOQ	42CBM/40’GP.50CBM/40’HQ
Packing	Inner Packing:0.2mm Thickness Plastic Bag,Outer Packing:Pallet With Carton And Strapped With Steel Tape
Delivery	Within 20 days After Confirm The Order
DaysPayment	TT,L/C,DP,MONEYGRAM,WESTERN UNION,PAYPAL
Usage	open-plan commercial buildings, large-span roofs, or high-performance flooring systems,industrial shelving, mezzanine floors, or roofs in regions with extreme snow,the flanges of engineered I-joists or in high-rise timber frame constructions.
Capacity	10000CBM PER MONTH
Standard Compliance & Certifications	EN 317 ,EN 319,EN 324,FSC™, CARB P2, ENF, CE, ISO 9001, ISO 14001, PEFC, etc.

Compare to other materials

Material comparison	OSB/4 (heavy load bearing)	Structural Plywood	Particle Board (Chipboard)	MDF (Medium-Density Fiberboard)
cost	⭐⭐⭐☆☆	⭐⭐⭐☆☆	⭐⭐⭐⭐⭐	⭐⭐⭐⭐☆
(MOE / MOR)	⭐⭐⭐⭐⭐	⭐⭐⭐⭐☆ (Uneven strength at the knot)	⭐☆☆☆☆	⭐⭐☆☆☆
(Fastener Holding)	⭐⭐⭐⭐☆	⭐⭐⭐⭐⭐	⭐⭐☆☆☆	⭐⭐☆☆☆ (Poor nail grip on the board edge)
Moisture resistance	⭐⭐⭐⭐☆ (MDI glue / V100 standard)	⭐⭐⭐⭐☆ (WBP/phenolic glue required)	⭐☆☆☆☆	⭐⭐☆☆☆ (MR moisture resistance rating required)
Surface & Machinability	⭐⭐☆☆☆ (Surface requires sanding and priming)	⭐⭐⭐☆☆ (Cutting can easily produce burrs)	⭐⭐⭐☆☆	⭐⭐⭐⭐⭐
in conclusion	The ultimate engineered structural panel. Designed for high loads, high humidity, and applications requiring maximum structural reliability, it’s the best choice for I-beams, shear walls, and long-span floors.	A traditional high-strength choice. Excellent nail holding power and puncture resistance, but performance uniformity is not as good as OSB/4.	The king of cost-effectiveness. Suitable only for non-structural applications in dry environments, such as RTA furniture cabinets, cabinet backs and interior decorative linings.	The ideal board for finishing. Its perfectly flat surface makes it the first choice for painting, CNC carving and plastic door panels, but it should never be used in high-load or very humid environments.