If a piece of wood is in perfect equilibrium with relative humidity of the air surrounding it it will neither absorb moisture from the air nor will the air absorb moisture from it. Bruce Hoadley believes it s critical to know the MC of the wood you re using in your fine woodworking projects. Conversely the line is somewhat flatter in the range of 20 to 55 RH.

The wood that is freshly cut can have a moisture content between 40 to 200 percent while the normal moisture content varies from 7 percent to 19 percent depending on the relative humidity in the air.

Woodworking This means that wood will swell to a significantly greater extent if it is exposed to prolonged humidity in excess of 85 RH. Woodworking may just be your hobby but you don t want to end up disappointed in the result because of a moisture-related issue. In the US and Canada maintaining anywhere from 30 to 40 relative humidity RH in your workshop is best since most areas in this region have an average humidity level of 37 . He says that 90 of woodworking problems involve moisture. Humidity changes that happen in this window have a slightly gentler effect on EMC and hence results in smaller amounts of shrinking and swelling.

According to leading woodworking and wood manufacturing experts 80 to 90 of woodworking and wood products manufacturing defects and problems are related to moisture. For woodworkers who build cabinets fine furniture musical instruments dishes toys decorative art boat restoration or various other wood products the acceptable wood moisture content normally ranges from 6 to 8 . The normal moisture content of wood or EMC varies from 7 -19 depending on the RH in the air. The most important factor to consider is where your finished piece will end up because if the location it ends up at has a significantly different relative humidity than your workshop it is very likely that it will warp. For the woodworker equilibrium is a good thing because it means that the wood will stay for practical purposes the same size and shape.

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