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id been wondering since first use if it was better to sanitise glad wrap before chucking it over the top of a fermenter but from what i just read regarding its use for burns i wont bother..
Because plastic wrap is extruded at temperatures in excess of 150 C, it is sterile as manufactured and handled in such a way that there is minimal opportunity for contamination before it is unrolled for use, said Mr. Clopton of the emergency care unit at Mercy Hospital, Iowa City. However, it's best to unwind and discard the outermost layer of plastic from the roll to expose a clean surface.
To assess concerns about sterility, Mr. Clopton and his associates at the University of Iowa obtained samples of plastic wrap from 5 newly opened rolls and 13 rolls that were already in use. Two samples - one taken from the already exposed outer layer and one from a freshly unrolled surface - were taken from each roll, pressed against the surface of a blood agar culture plate, and incubated at a temperature of 35 C.
After 48 hours of incubation, 14 (39%) of the 36 samples showed no bacterial growth and 29 (81%) of the 36 samples grew 3 or fewer colonies. No growth was observed on freshly unrolled surfaces in 4 of the 5 new rolls and in 7 of the 13 rolls already in use, Mr. Clopton reported in the poster.