Oak

Traditionally used in a wide range of applications – from toys to floors and boats to buildings – oak is one of the most important hardwoods in the northern hemisphere. It is a durable, hard-wearing and reasonably stable wood with an attractive grain pattern. White oak, in particular, may show distinctive rays when quatersawn. It is available from well-managed and sustainable forests in large quantities.

Oak is rich in tannin. The bark contains the highest concentration and this is why it is used in traditional leather tanning and iron preservation (Japanese teapots), for example. Oak has been reported as a sensitiser, with some people developing an allergic reaction in the skin or eyes after repeated and long-term exposure to the dust.

Acetic acid is known to emit from woods, and oak is thought to emit some of the highest concentrations (up to around 7% by weight over a couple of years). This presents a problem for certain types of interior, such as museums. The acidity is harmful to metals, especially those containing iron. Over time, black stains will develop around iron and steel fixings, such as nails and screws. Therefore, galvanised steel or copper, are recommended.