3M Comply Thermalog 2134 steam chemical indicators consist of a paper wick and steam and temperature sensitive chemical contained in a paper/film and foil laminate envelope.
Steam enters the permeable topside of the device. This causes a chemical dye to melt and move along the paper wick; the distance or extent of migration depends on exposure to steam, time, and temperature.
The migration is visible through 2 "windows" marked UNSAFE or SAFE. When the pressure temperatue and duration of sterilisation has reached a crtical combination, the blue dye should enter the SAFE window. If it does not, then the critical parameters of the steam sterilization process (time, temperature, and saturated steam) were not present.
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