All Cressi-sub regulators are supplied with NBR O-rings and all
inner components are greased with appropriate lubricants; these
materials guarantee the best lubrication and protection from the
salty and corrosive sea environment.
As proved by tests carried out by NASA (NASA DOCUMENT
TR-900-001), using silicone lubricants is excellent for equipment
using Nitrox hyper-oxygenated mixtures with oxygen percenta-
ge up to 40%.
The most recent European standards EN13949 and EN144/3
prescribe all equipment using mixtures containing more than
22% oxygen to be certified also with a pure oxygen working test,
which is difficult to get through using silicone lubricants.
Cressi-sub regulators are therefore EC certified only for use with
air and mixtures containing less than 22% oxygen and must not
be used, in EEC countries, with hyper-oxygenated mixtures.
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