Composite material having improved chemical resistance, and process for its preparation

Composite material comprising a substrate, a located on the substrate, organic bonding agent layer is composed of a carbon compound, located on the adhesive layer inorganic barrier layer of a compound and located on the barrier layer organic protective layer with chemical barrier effect from a minimum of 10% carbon-containing compound, wherein the adhesive layer SiO with 1.0 ≤ x ≤ 2.8 and 0.1 ≤ y ≤ 2.8; the barrier layer SiO with 1.0 ≤ x ≤ 2.8 and the protective layer of SiO with 1.0 ≤ x ≤ 2.8 and 0.1 ≤ y ≤ 2.8 comprising characterized in that the carbon content of the protective layer is greater than the carbon content of the adhesive layer.