Inhibitor parcel and method for preserving electronic devices or electronic parts

A method of using an inhibitor parcel for preservation of electronic devices or electronic parts which comprises tightly sealing an electronic device or an electronic part into a gas barrier container together with the inhibitor parcel which comprises:

• (a) a composition comprising an unsaturated fatty acid compound as its main ingredient sealed between two sheets of
• (b) a permeable diffusing-parcelling material, said diffusing-parcelling material comprising:
• (i) a base sheet made of a plurality of fibers bonded together by an adhesive or a base sheet made of a fibrous material coated with an adhesive coating,
• (ii) an oxygen permeable resin layer laminated onto a first, exterior side of said base sheet, said oxygen permeable resin layer comprising at least one member selected from the group consisting of silicon resin, polyethylene resin, ethylene-vinyl acetate copolymer, natural rubber, synthetic rubber, cellulose and cellulose compounds,
• (iii) a porous film of low softening point resin or a low softening point nonwoven fabric laminated onto a second, interior side of said base sheet,
• with the proviso that said permeable diffusing-parcelling material (b) has an oxygen permeability of 10.sup.4 to 10.sup.6 ml/m.sup.2.Atm.day and a water vapor permeability/oxygen permeability ratio of at least 0.02 H.sub.2 O mg.Atm/O.sub.2 ml at 25.degree. C. and a relative humidity of 50%, and
• with the proviso that said second, interior side of said base sheet faces toward said composition (a), and said first exterior side of said base sheet is opposite said second, interior side of said base sheet.