The bottom line: The type of project will guide your decision, MDF vs. plywood. Load capacities in Table A are based on normal duration of load for untreated panels under dry conditions. Plywood and MDF are useful materials for many DIY projects around the home. MDF is a better material than plywood for patterns because its edges are smoother, but it’s not strong enough to make long, thin patterns. In addition, it has the lowest ductility and the highest thermal conductivity. If it gets wet, the fibers will pull apart, and expand. Load-Span Tables for APA Structural-Use Panels Number Q225G ... L/240 and L/180 and maximum loads controlled by bending and shear capacity. sheets, although you may have to order them through a lumberyard. MDF comes in 1/4 in. and 1/2-in. 1/4-in. strenthwize, ply has MDF beat. Load capacities in Table A are based on normal duration of load for untreated panels under dry conditions. The applicable section properties (Table C) can be divided into load capacity to determine design strength and stiffness. Table 3 capacities may be adjusted for panel type using Table 4. Because these values are OSB … Most workbenches you see will come with MDF instead of ply. MDF is a wood-based material. But for a work surface, MDF is a much better choice. Allowable wood stress in compression parallel to grain is 850 PSI. As an engineering rule of thumb, wood beams/shelves will sag an additional 50% over time beyond the initial deflection induced by the load. The Sagulator computes initial sag only. So if you put a cool drink down on it in summer, you may get a raised ring from the condensation. Zero deflection. The graph bars on the material properties cards below compare MDF to other wood-based materials (top) and the entire database (bottom). MDF is the cheapest and flattest wood you can buy at local hardware stores. Thin MDF is handy for making patterns. Loads must be concentrically … MDF is easy to sand, particularly when it’s thin. It’s uniform in thickness, and easy to work with. MDF does not react well with water though. MDF is worse, and particleboard is even worse. The eye will notice a deflection of 1/32″ (0.03″) per running foot, or 3/32″ (0.09″) for a 3′ wide bookshelf. The applicable section properties (Table C) can be divided into load capacity to determine design strength and stiffness. All load capacities are based on axial loads with no moments. Lumber Species Specific Gravity 5/16" Shank Lag Screw 3/8" Shank Lag Screw #10 Wood Screw Douglas Fir-Larch 0.5 340 390 173 Douglas Fir-South 0.46 301 344 146 Plywood tends to creep under load and shelves will develop a permanent "set" that persists even when the load is removed (hint: make plywood shelves removable so you can flip them if this happens). It has the highest density among wood-based materials. Medium-density fiberboard 0.7–0.9 3.59 (0.52) 35.85 (5,200) ... Modulus of rupture reflects the maximum load-carrying capacity of a member in bending and is proportional to max-imum moment borne by the specimen. ... Load hundreds of books for the last 16 years.

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