BS 6256:2021 pdf free
BS 6256:2021 pdf free.Packaging for terminally-sterilized medical devices – Method for determination of methylene blue particulate penetration.
The following documents are referred to in the text In such a way that some or all of their content constitutes provisions of this document’s. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
BS EN 20187, Paper, board and puips – Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples
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Principle
COMMENTARY ON CLAUSE 4
The layout of the apparatus is illustrated in Figure 1 and Figure 2.
The atomizer, working under a constant pressure and flow of compressed air, disperses a solution of methylene blue Into a mist at a uniform rate. The mist passes into the evaporation tube (E) where It is diluted to a total volume of 30 dm/min by dry air entering at (B). The droplets of solution evaporate before reaching the control cock (C), leaving a residue of solid particles of methylene blue. When the control cock (C) is in the test position, the test cloud passes to the test circuit which contains the sample under test and the filter paper.
When the control cock is turned to the central or air position, the cloud is diverted to the by-pass circuit and at the same time air is drawn through the test circuit. In the off position of the control cock, the cloud remains diverted to the by-pass circuit, but there is no flow through the test circuit. The rates of flow in the circuits are adjusted to 30 dm/min by means of the air valves and V.
To test a sample, the control cock is first turned to the off position and the sample and filter paper are inserted into their respective holders. The test cloud is then passed to the sample for a predetermined time, following which air is passed for a further period of 2 s in order to sweep out the residual cloud from the test circuit. The control cock is then turned to off and the filter paper removed. Finally, the test stain is developed with steam and the penetration assessed by comparing the stain with the standard stains.BS 6256 pdf free download.
