Is it a special impregnation treatment, that you don't understand? To me, the term is pretty much self-explaining and evident. It drives from Wood conservation, where a product is impregnated with a substance that prevents further decay of the wood. Similarly, the term might be used in other areas.....
May be it is a good idea to Elaborate a bit further on what you feel should be explained ...?
impregnation - the process of totally saturating something with a substance; for example : "the impregnation of wood with preservative"; "the saturation of cotton with ether , or impregnate resin use for porosity sealing of materials like casting , ceramic
impregnation - the process of totally saturating something with a substance; for example : "the impregnation of wood with preservative"; "the saturation of cotton with ether , or impregnate resin use for porosity sealing of materials like casting , ceramic