... .015 g / ( m2 ยท 24h) , and also with heat sealing function,vacuum packaging,it is opaque in silvery white with anti- gloss ... ,pharmaceutical intermediates such as moistur,keep out of the sun,vacuum-packed and so on.Usually use of a four-story structure ... known as composite bag)Mainly applied to hardware, electronic components , vacuum requirements , packaging , etc.Free sample can be supplied.Any size ...