The Villeroy & Boch tiles shown are licence products from V&B Fliesen GmbH

Are nonvitreous and glazed vitreous resistant to chemicals?

Yes. They are resistant to household chemicals and bath water additives in accordance with DIN EN 122, and to acids and alkalis where specified. Unglazed vitreous tiles are resistant to chemicals in accordance with DIN EN 106, with the exception of hydrofluoric acid and compounds of the same.