NOVELTY - Use of a biomass torrefaction condensate (BTC), obtained by torrefying biomass at 240-350 degrees C and condensing the volatalized fraction of the torrefied biomass at 100 degrees C above and 50 degrees C below the condensation temperature of water, as a binding agent for solid material, is claimed.    USE - The BTC is useful for producing a wear- and water-resistant solid fuel and torrefied biomass-derived material as a fuel; and for upgrading biomass. The BTC is useful as an additive e.g. bio-bitumen, binding agent, filler or adhesive, lubricant, in a solid, preferably shaped material (all claimed) including pavings, floorings (e.g. linoleum), or construction materials e.g. chipboard, together with oils, cork, wood dust, wood chips, other organic or inorganic fillers, or in paints, protective coatings, inks. The BTC is useful also as phenol substitutes in wood resins (phenol-formaldehyde resins) or as a substitute for high value phenolic compounds e.g. guiacols, syringols and alkylated phenols, preferably in shaped products comprising sheets, plates, tiles and bricks.    ADVANTAGE - The BTC provides the torrefied material, which has: a smallest outer particle size of 2 mm to 10 cm; a bulk density of 0.35-1 kg/dm3, preferably 0.65-0.9 kg/dm3; a specific density of 0.8-1.5 (preferably 1.1-1.4) kg/dm3; a calorific value (higher heating value (HHV)) of 18-28 MJ/kg; a moisture content of less than 5 wt.%, also after storage at ambient conditions for at least 1 month; a biomass-derived carbon content of at least 75% i.e. 14C content of at least 5.10-13 (0.5 ppt); a grindability corresponding to a power consumption below 0.5 MJ/ton on a 0.25 mm mesh; and stability to ambient (outdoor) conditions for at least 1 month, where the torrefied material comprises at least 95 wt.%, preferably at least 99 wt.% of material that originates from the biomass torrefaction process, and not more than 5 wt.% other additives, which do not originate from the biomass torrefaction process. The solid fuels and the densification process are more energy and waste efficient than prior art pellets and processes.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) producing a wear- and water-resistant solid fuel, comprising combining a solid carbonaceous material with 1-25 wt.% (based on the combined weight) of the BTC;    (2) upgrading biomass comprising subjecting the biomass to torrefaction at 240-350 degrees C, to produce a torrefied solid fraction and a volatalized fraction, cooling the volatalized fraction to produce an organic condensate, combining the condensate with a torrefied solid fraction and densifying the torrefied solid fraction; and    (3) the torrefied biomass-derived material as a fuel, obtainable by the process.