Q:
What is the toxicity of MDF dust, and what hazards do we face by being exposed to this material?
Peter Lundquist, Calumet City, IL
A:
Most MDF, or medium-density fiberboard, is held together with urea-formaldehyde resins. This type of adhesive lends strength and stability to the panels, but also emits small amounts of formaldehyde. This can irritate eyes and respiratory systems and cause more severe health problems in people with an extreme sensitivity. Two alternatives are Medex and Medite II from Medite Corp. These products emit extremely low levels of formaldehyde.
Fine Woodworking Recommended Products
AnchorSeal Log and Lumber End-Grain Sealer
Good for both sealing the end grain of freshly cut logs and boards, this wax prevents end-grain checking and saves material
DeWalt 735X Planer
At high speed, the planer works fast and leaves a smooth surface. But the slower, finish speed produces an almost glass-smooth surface. Knife changes are easy.
Ridgid R4331 Planer
Priced nearly $300 less than the DeWalt 735X, the Ridgid R4331 is an excellent value. Its three-knife cutterhead left wonderfully clean surfaces on plainsawn white oak and white pine. It did not perform nearly as well on curly maple as the 735X.
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