... 4A molecular sieve has an effective pore opening of about 4 angstroms(0.4nm).4A molecular ... will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger ... LPG,air,inert and athmospheric gases,etc.- Removal of hydrocarbons,ammonia and methanol from gas streams (ammonia ... types are used in the air break units of buses,trucks and locomotives- Packed in small bags,it ...