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Mixtures containing reactive and corrosive gases (e.g. formaldehyde) have limited shelf life in standard, untreated cylinders because the gases react with the internal surface, changing the composition of the mixture. This mixture instability also means that the measurement uncertainties for reactive components are wider than for stable ones.
Instability of calibration gases containing reactive gases can cause problems because
Treated cylinders increase the stability of mixtures and improve shelf lives, providing confidence in your measurements.