Den nederste del af systemet er lavet af glykolmodificeret polyætylen- tereftalat og indeholder: anode- hydrogel inkl. fentanyl HCl, polacrilin, renset vand, natriumhydroxid, polyvinylalkohol; katode- hydrogel inkl. renset vand, natriumklorid, natriumcitrat, polyvinylalkohol, vandfri citronsyre, cetylpryridiniumklorid; anode- elektrode af lag af sølvfolie og elektrisk ledende selvklæbende tape; katode- elektrode af lag af sølvklorid- sammensat materiale, sølvfolie og elektronisk ledende selvklæbende tape; hudklæber bestående af en blanding af to PIB’ er, et polybuten og harpiksester, der virker som klæber, beskyttende lag som er en polyesterfilm beklædt på den ene side med silikone.
The bottom housing is made from glycol-modified polyethylene terephthalate, and contains: anode hydrogel, including fentanyl HCl, polacrilin, purified water, sodium hydroxide, polyvinyl alcohol; cathode hydrogel, including purified water, sodium chloride, sodium citrate, polyvinyl alcohol, anhydrous citric acid, cetylpyridinium chloride; anode electrode, containing layers of silver foil and electrically conductive adhesive tape; cathode electrode consisting of layers of silver chloride composite material, silver foil, and electrically conductive adhesive tape; skin adhesive composed of a mixture of two PIBs, a polybutene, and a resin ester that acts as a tackifier; protective liner which is a polyester film coated on one side with silicone.