Medium density overlay panel

Medium density overlay panel, or MDO panel, is a paintable surface made of plywood with a weather-resistant resin overlay bonded to the wood by heat and pressure. The overlay, which has at least 27% resin content,{{cite book |title=Voluntary Product Standard PS 1 |page=20 |year=2009 |publisher=APA - The Engineered Wood Association}} resists water, weather, wear and degradation. A similar product with a more rugged, smoother surface is called high density overlay (HDO) plywood.{{cite book |title=HDO/MDO Plywood Product Guide |year=2011 |publisher=APA - The Engineered Wood Association |url=https://www.apawood.org/publication-search?q=b360}}{{rp|page=4}}

Development

Originally developed for sign painting and concrete formwork industries, MDO is also used for other applications{{rp|page=5}} as a paintable surface. Paint finishes on MDO are up to three times more durable than the same finish applied to ordinary plywood

It is a plywood product, with a paper face overlaid on the plywood substrate with an exterior grade (usually) phenolic adhesive. MDO is designed to have a smooth, paint-receptive surface. One or both faces can be surfaced with paper, and is produced in 4-foot-by-8-foot sheets from {{frac|3|8}} inches to over 3 inches in thickness.

References

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