×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Brine attack on LSZH optical fibre

Brine attack on LSZH optical fibre

Brine attack on LSZH optical fibre

(OP)
I was copied in an email exchange regarding possible attack on the sheath of low smoke / zero halogen optical fibre (and presumably other LSZH cables too). This is something I've not heard of before and was wondering if it is a problem familiar to others. Any references or case studies would be very welcome, as would any assist on a brine-resistant LSZH optical cable.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Brine attack on LSZH optical fibre

I don't know a salt mist test requirement for any cable. There are requirements for salt mist test for connectors see [for instance]: http://www.hirose.co.jp/cataloge_hp/e74902032.pdf
The optical cable components [silica or POF or jacket-PE or PUR-] are not sensible to salt -as far as I know-and salt water penetration is usually blocked.
But there are other components  sensible to salt[brine] as aluminum foil or corrugated steel armor. The filling Petroleum Jelly may be sometime sensible to concentrated brine- as I heard. Also aramid inner sheath is sensible to salt.I'm not sure it helps anyway...
 

RE: Brine attack on LSZH optical fibre

(OP)
Hi 7anoter4,

I'm not sure that PE and PUR could be described as LSZH can they? I think it must be a problem specific to the sheath material used in LSZH applications but I'm not sufficiently knowledgable in plastics to know what it might be. Thanks for the input - I'm surprised how little there has been in terms of response to this thread, although that might in itself indicate that brine attack on fibre cable is the stuff of myth and not fact.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Brine attack on LSZH optical fibre

Hi Scotty,
There are PE or PUR compounds halogen-free, indeed. The resin is halogen-free but there are also some ingredients as lubricants and stabilizers which have to be halogen free.
See, for example, these:
http://www.lumberg-automationusa.com/con/pdf/61020_R041107.pdf
http://www.hitechcontrols.com/cables/halogen_free_security_cables/intro_pages/introduction_halogen_free.html
The new core and cladding material of fluorinated polymers-containing fluor -a halogen element-are not halogen-free- as one could see.
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources