Molecular Sieve 13X is the sodium form of the type X crystal and has a much larger pore opening than the type A crystals. It will adsorb molecules with a kinetic diameter of less than 9 Angstrom ( 0.9 nm) and exclude those larger. It also has the highest theoretical capacity of the common adsorbents and very good mass transfer rates. It can remove impurities too large to fit into a type A crystal and is commonly used to separate nitrogen from oxygen. Contact person: Miss Tracy Yeung Tel: + 86-13420991282 Email: tracy_jincheng@ yahoo.cn MSN: tracy_jincheng@ hotmail.com SKYPE: tracyyeung104