eters ▁between ▁ 2   nm ▁and ▁ 5 0   nm . ▁mac rop orous ▁materials ▁have ▁p ore ▁diam eters ▁of ▁greater ▁than ▁ 5 0   nm . ▁ ▁Mic rop ores ▁may ▁be ▁defined ▁differently ▁in ▁other ▁context s . ▁For ▁example , ▁in ▁the ▁context ▁of ▁por ous ▁aggreg ations ▁such ▁as ▁soil , ▁mic rop ores ▁are ▁defined ▁as ▁cav ities ▁with ▁sizes ▁less ▁than ▁ 3 0   μ m . ▁ ▁Us es ▁in ▁labor ator ies ▁ ▁Mic rop orous ▁materials ▁are ▁often ▁used ▁in ▁labor atory ▁environments ▁to ▁facil itate ▁cont amin ant - free ▁exchange ▁of ▁g ases . ▁Mold ▁sp ores , ▁b acter ia , ▁and ▁other ▁air bor ne ▁cont amin ants ▁will ▁become ▁tra pped , ▁while ▁allowing ▁g ases ▁to ▁pass ▁through ▁the ▁material . ▁This ▁allows ▁for ▁a ▁ster ile ▁environment ▁within ▁the ▁contained ▁area . ▁ ▁Use ▁in ▁medicine ▁ ▁Mic rop orous ▁ad hes ive ▁t ape ▁is ▁a ▁surg ical ▁t ape ▁used ▁to ▁hold ▁w ound ▁dress ings ▁and ▁band ages ▁in ▁place , ▁introduced ▁in ▁ 1 9 5 9 ▁by ▁ 3 M ▁with ▁the ▁trade ▁name ▁Mic rop ore . ▁It ▁can ▁be ▁used ▁to ▁hold ▁gau ze ▁padding ▁over ▁small ▁w ounds , ▁usually ▁as ▁a ▁temporary ▁measure ▁until ▁a ▁suitable ▁dress ing ▁is ▁applied . ▁The ▁Ster i - St rip ▁was ▁derived ▁from ▁Mic rop orous ▁surg ical ▁t ape . ▁ ▁Other ▁uses ▁ ▁Mic