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What does MDO plywood stand for?
MDO stands for medium-density overlay. It refers to exterior-grade structural plywood with a resin-impregnated kraft paper overlay bonded to one or both faces under heat and pressure. The overlay gives the panel a paint-ready face; the plywood core handles structural load.
Is MDO plywood waterproof?
Water-resistant, not waterproof. The face overlay sheds direct rain when properly primed and painted, and the WBP plywood core handles humidity cycling. Cut edges absorb water and need primer or polyurethane sealing. Sustained site exposure beyond 7-10 days without protection will degrade the overlay.
Where can I buy MDO plywood?
For paint-grade signage, soffits, and architectural exterior trim, APA-trademarked MDO from Roseburg, Plum Creek, or Boulter is the reference — stocked at specialty plywood distributors and sign-supply yards (Toledo Plywood, Sylvan, Weekes Forest Products). Big-box retailers carry it inconsistently. For matte-finish concrete formwork, container-direct from Vietnam is competitive above 200 sheets — Vinawood's MDO range covers 45 SKUs at /collections/mdo-plywood, in 12-21 mm thicknesses across imperial and EU formats.
What's the difference between MDO and HDO plywood?
Overlay density. MDO uses a 20-30 g/m² medium-density paper overlay; HDO uses a 45+ g/m² high-density phenolic overlay. HDO is harder, more abrasion-resistant, and produces a near-mirror concrete finish. HDO delivers 25-50 reuse cycles in formwork; MDO delivers 5-15. HDO costs more upfront and pays back at high cycle counts.
Can MDO plywood be used for concrete forms?
Yes — it's one of the standard formwork choices. 5 to 15 reuse cycles is typical for MDO formwork, depending on overlay weight and edge-sealing discipline. Above 15 cycles, the kraft paper overlay starts to wear and the cost-per-pour math favours HDO with a phenolic film face. For one-off or low-rotation pours where the cured concrete will be painted afterward, MDO is the right choice.