Discoloration of Wood Surfaces

A new study investigated the discoloration and roughening of finished and unfinished ash, red oak, and hard maple wood surfaces exposed to artificial weathering, with the aim of assessing the potential for ash wood for interior and exterior applications. Ash wood surfaces were treated with several coats of satin and high gloss polyurethane finishes in order to evaluate their potential for value added products from waste ash wood generated from an exotic insect infestation. Red oak and red maple wood specimens were included in the study for comparison purposes.

The results showed that ash wood exposed to a combination of UV light and water spray had a colour change pattern very similar to that of maple, and both species had faster and higher levels of discoloration compared to red oak. However, when exposed to continuous UV radiation without water, ash had a higher level of discoloration than maple and red oak. Evaluation of changes in the roughness showed that maple had the lowest roughness after weathering, but finished ash surfaces also showed roughness characteristics similar to that of maple after 450 h exposure.

Source: CE.

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