Lightweight composite material having a scratch-resistant surface and method for the production thereof

A method for producing a composite material, comprising the steps of:

• providing a casting mould,
• providing a resin,
• providing a first filler which has a density of >2 kg/l and a Mohs hardness of >4,
• providing a second filler which differs from the first filler in at least one property and has a bulk density of <2.5 kg/l, wherein the particles of the second filler are selected from a group consisting of hollow polymer spheres, polymer granules, hollow glass spheres, synthetic porous glass or ceramic spheres, zeolite, aluminium trihydroxide (ATH), expanded perlite, and pumice stone,
• setting a viscosity of the resin at which the mobility of particles of the first filler differs from the mobility of particles of the second filler in the resin,
• filling the provided substances into the casting mould,
• setting a concentration of the first filler in the resin that decreases in the vertical direction from a base surface of the casting mould by utilising the different mobility of the particles of the first filler and the mobility of the particles of the second filler, and
• subsequently hardening the resin to form a composite material.