Shaandho molecular 3A, oo sidoo kale loo yaqaan shaandho molecular KA, oo leh dalool ku dhawaad 3 angstroms, ayaa loo isticmaali karaa qalajinta gaaska iyo dareeraha iyo sidoo kale fuuq-baxa hydrocarbons.Waxa kale oo si weyn loogu isticmaalaa qalajinta dhammaystiran ee batroolka, gaaska dillaacsan, ethylene, propylene iyo gaaska dabiiciga ah.
Mabda'a shaqada ee shaandhada molecular inta badan waxay la xiriirtaa xajmiga daloolka shaandhada molecular, kuwaas oo ah 0.3nm/0.4nm/0.5nm siday u kala horreeyaan.Waxay ku dhejin karaan molecules gaaska dhexroorkoodu ka yar yahay cabbirka daloolka.Baaxadda cabbirka daloollada, way sii weynaataa awoodda xajinta.Cabbirka daloolku wuu kala duwan yahay, waxyaalaha la shaandheeyay iyo kuwa la kala saarayna way kala duwan yihiin.Marka la eego siyaabaha fudud, 3a shaandho molecular kaliya waxay ku dhejin kartaa molecules ka hooseeya 0.3nm, 4a shaandho molecular, molecules adsorbed waa inay sidoo kale ka yaraadaan 0.4nm, iyo 5a shaandho molecular waa isku mid.Marka loo isticmaalo sida qallajiyaha, shaandhada molecular waxay nuugi kartaa ilaa 22% miisaankeeda qoyaanka.