Black locust is extremely resistant to changing weather conditions, so typical for our climate zone. Wood hardness is along with thickness one of the most important features of wood. Black locust is considered as very hard wood. Such additional components of black locust as tanners, rubbers, resins and essential oils improve wood resistance. Tanners are natural preservatives which prevent it from rotting. Others, e.g. resin compounds, are a kind of mechanical barrier which stop mould from spreading in the wood. More about black locust you can find hire.