▁found ▁to ▁yield ▁an ▁effective ▁thermal ▁conduct ivity ▁increase ▁up ▁to ▁ 2 1 6 %. ▁ ▁Vol um et ric ▁lat ent ▁heat ▁storage ▁capacity ▁can ▁be ▁low ▁ ▁Fl amm able . ▁This ▁can ▁be ▁partially ▁alle vi ated ▁by ▁special ised ▁contain ment . ▁ ▁In organ ic ▁ ▁Salt ▁hyd r ates ▁( M x N y H 2 O ) ▁▁ ▁Adv antages ▁ ▁High ▁vol um et ric ▁lat ent ▁heat ▁storage ▁capacity ▁ ▁Av ail ability ▁and ▁low ▁cost ▁ ▁Sh arp ▁mel ting ▁point ▁ ▁High ▁thermal ▁conduct ivity ▁ ▁High ▁heat ▁of ▁fusion ▁ ▁Non - fl amm able ▁ ▁Dis adv antages ▁ ▁D iff icult ▁to ▁prevent ▁incon gru ous ▁mel ting ▁and ▁phase ▁separation ▁upon ▁cy cling , ▁which ▁can ▁cause ▁a ▁significant ▁loss ▁in ▁lat ent ▁heat ▁ent hal py . ▁▁ ▁Cor ros ive ▁to ▁many ▁other ▁materials , ▁such ▁as ▁met als . ▁This ▁can ▁be ▁overcome ▁by ▁enc aps ulation ▁in ▁small ▁quantities ▁in ▁non - re active ▁pl astic . ▁▁▁ ▁Change ▁of ▁volume ▁is ▁very ▁high ▁in ▁some ▁mi xt ures ▁▁ ▁Super ▁cool ing ▁can ▁be ▁a ▁problem ▁in ▁solid – liqu id ▁transition , ▁necess it ating ▁the ▁use ▁of ▁nucle ating ▁agents ▁which ▁may ▁become ▁in oper ative ▁after ▁repeated ▁cy cling ▁ ▁H yg ro scop ic ▁materials ▁▁ ▁Many ▁natural ▁building ▁materials ▁are ▁h yg ro scop ic , ▁that ▁is ▁they ▁can ▁abs orb ▁( water ▁cond enses )