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What is the difference between MDO and HDO plywood?

Asked by Carl Payne on September 14, 2021

Categories: Hobbies and interests Woodworking


Rating: 4.7/5 (72 votes)

Both MDO and HDO are hardwood plywoods with a resin soaked fiber overlays between the veneer layers and on both surfaces. Theonly differences between the two products are that the density of the exterior fiber layer on the HDO is considerably higher than for MDO and it is manufactured with higher resin content.

What does MDO plywood look like? MDO, also known as Signboard, is an exterior-grade plywood with a high-quality fiber surface saturated with phenolic resin solids. The plywood below the fiber face is smooth, clear and free of patches, providing a smooth surface with minimal grain showing through. MDO plywood is water-proof andweather-resistant.

What is MDF plywood? Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibres, often in a defibrator, combining it with wax and a resin binder, and forming it into panels by applying high temperature and pressure. MDF is generally denser thanplywood.

How much does a 4x8 sheet of plywood cost? A 4x8-foot sheet of construction-grade plywood costs roughly $10 a sheet, while the same size sheet of OSB costs only $6 a sheet. Both cost about the same to install, $70 an hour for a carpenter. Installing either sheathing over a 500 square foot area would cost roughly $160 in material for plywood and$100 for OSB.

Is phenolic plywood waterproof? Since the phenolic surface is_extremely smooth, it is_extremely low friction, making it an ideal surface where other wood pieces would need to slide over it. While the phenolic provides for a high degree of water repellency, this is not the same as to say that phenolic plywood is waterproof.