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BS EN 12021:2014
Respiratory equipment. Compressed gases for breathing apparatus (British Standard)
This European Standard specifies requirements for the quality of compressed gas supplied for mixing or use in respiratory protective devices and hyper- and hypobaric operations. Account is taken of the use of compressed gases for normal atmospheric pressure as well as for hyper- and hypobaric pressures. This European Standard does not apply to compressed gases used for medical purposes or for aerospace applications.
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British Standards Institution [bsi]
British Standards Institution [bsi]