This is a high-purity divinylbenzene polymer with 80% highly-crosslinked DVB. It combines high surface area with a high operating temperature. HayeSep®; D polymers offer superior separation characteristics for light gases; significant separation abilities include the separation of CO and CO2 from room air at ambient temperatures and the separation of acetylene prior to other C2®. It is highly recommended for the separation of water and hydrogen sulfide. HayeSep D is available in three different porosities with surface areas from 774 to over 800 m2/gram. This range is especially useful for certain difficult separations; for example water elutes before ethane with DB, but after ethane with Dip. HayeSep Db has a surface area of 781 m2/g.