What is the code used for?
8531 20 40 is a CN code, an eight-digit code of the EU's Combined Nomenclature. Its start, 8531 20, is the worldwide HS subheading; as a TARIC code it is written 8531 20 40 00.
The code has subheadings, so it cannot be declared as it is: pick the subheading below that describes the goods most precisely.
Duties, VAT, import restrictions and the other measures that apply to the code are in the EU's TARIC service. The search is a guide only; Finnish Customs gives binding decisions on classification (Binding Tariff Information).