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All Cressi-sub regulators are supplied with NBR O-rings and all
inner components are greased with silicone, that guarantee the
best lubrication and protection from salted 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 impossible 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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