Biochar is a porous carbonaceous material produced from biomass through carbonisation. The product is intended for use as a biochar material in construction related applications, where its carbon content, alkaline character and porous structure provide relevant material functionality. Received biochar has a moisture content of approximately 61 wt.% due to hygroscopic behaviour. The biochar has a low bulk density of approximately 300 kg/m³. Specific characteristics of biochar vary depending on particle fraction and moisture conditions. The ash content of the biochar is approximately 12 wt.% on a dry basis. The biochar is generally characterised by high carbon content, with representative dry basis values of approximately 86 wt.% total carbon and 85 wt.% organic carbon. It has a low molar H:Corg ratio of approximately 0.16, and a low O:C ratio of approximately 0.02. The material is alkaline, with pH of approximately 9. Testing is performed for relevant physical properties, chemical composition, heavy metals, nutrients, PAHs, dioxins, furans and PCBs using recognised DIN, EN and ISO methods.