Membranes, in general, are selective barriers available in different shapes and sizes for separating gases or liquids based on different factors.

A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. They are crystalline metal aluminosilicates having a three dimensional interconnecting network of silica and alumina tetrahedra.

In Nordische, different microporous molecular sieves are developed for different applications. Most common types are zeolite, active carbon, GO and MOFs. They are mainly used for gas separation and storage, different metal extraction and water adsorbtions.