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Thread: SiTech Important information regarding valves on rebreathers

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    RBW Member fsardone is an unknown quantity at this point fsardone's Avatar
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    Exclamation SiTech Important information regarding valves on rebreathers

    I am sure this is already known (it was also on scuba board but I could not find it here):

    http://www.sitech.se/news/important-...breathers.aspx

    We have received information about a possible safety issue. There is a thesis from an English laboratory that components made from PC/PBT plastic compound/material may deteriorate when exposed to sodium hydroxide or calcium hydroxide and make the material craze, brittle and crack.

    Sodium hydroxide and calcium hydroxide exposure can occur when a rebreather is flooded with water according to the information given to us. Our valves are made of a PC/PBT plastic compound/material.

    As soon as we received an indication of the above we initiated our own testing and research.

    We are still having ongoing tests and research in the matter and do not have an answer on their thesis.

    Our recommendation is that, if a rebreather and its valve/valves are exposed to a flooding and thereby exposure to a mixture of water and sodalime (sodium hydroxide and calcium hydroxide), the valve/valves should be exchanged.

    Dive safe

    Fabio

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    RBW Member Doole is on a distinguished road Doole is on a distinguished road Doole's Avatar
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    Re: SiTech Important information regarding valves on rebreathers

    Paging Brad Horn..

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    Re: SiTech Important information regarding valves on rebreathers

    Quote Originally Posted by Doole  View Original Post
    Paging Brad Horn..
    oh gawd please nooooooooooooooo

  4. #4
    Dave Tomblin wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc's Avatar
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    Re: SiTech Important information regarding valves on rebreathers

    Quote Originally Posted by fsardone  View Original Post
    I am sure this is already known (it was also on scuba board but I could not find it here):

    http://www.sitech.se/news/important-...breathers.aspx

    We have received information about a possible safety issue. There is a thesis from an English laboratory that components made from PC/PBT plastic compound/material may deteriorate when exposed to sodium hydroxide or calcium hydroxide and make the material craze, brittle and crack.

    Sodium hydroxide and calcium hydroxide exposure can occur when a rebreather is flooded with water according to the information given to us. Our valves are made of a PC/PBT plastic compound/material.

    As soon as we received an indication of the above we initiated our own testing and research.

    We are still having ongoing tests and research in the matter and do not have an answer on their thesis.

    Our recommendation is that, if a rebreather and its valve/valves are exposed to a flooding and thereby exposure to a mixture of water and sodalime (sodium hydroxide and calcium hydroxide), the valve/valves should be exchanged.

    Dive safe

    Fabio
    Perhaps design a rebreather that is no likely to flood
    Cheers,

    Dave....

    www.wedivebc.com

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