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Cable Sheathing Material "LSZH"

Dutch of the Elm
Hi,


I hope someone can assist. 


I am interested in studying the materials used to sheath "LSZH" / "LSF" cables, particularly ones such as twin and earth.  Can anyone confirm what kinds of compounds are typically used to sheath these cables?  Specifically LSF/LSZH ones, so not PVC.  I had assumed XLPE but a number of manufacturers seem to state "LSZH" sheath etc alongside XLPE insulation, so I am lead to understand the sheath is not XLPE... or am I overthinking it?  I have tried to asking a manufacturer but I have not had a clear answer.  


Looking forward to some answers.


Thanks,

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  • 0
    zero halogen means no chlorine, so not PVC, but polypropylene and polyethylene are candidates for ZH. However neither are exactly 'low smoke', this is generally achieved by adding finely powdered mineral fillers (aluminium or magnesium oxides  or hydroxides for example, or in some case chalk, a carbonate that gives of CO2 when heated)


    The inert filer means the fuel to thermal mass ratio no longer favours a run-away burning reaction, this is In much the same way as wet wood needs so much extra heat to heat the water before it can get hot enough to self ignight  it that a fire tends not to keep going.


    Exact mixes and which mineral fillers are probably a jealously guarded trade secret. They certainly blunt your wire strippers faster, and the ones with a lot of mineral are quite stiff.
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  • 0
    zero halogen means no chlorine, so not PVC, but polypropylene and polyethylene are candidates for ZH. However neither are exactly 'low smoke', this is generally achieved by adding finely powdered mineral fillers (aluminium or magnesium oxides  or hydroxides for example, or in some case chalk, a carbonate that gives of CO2 when heated)


    The inert filer means the fuel to thermal mass ratio no longer favours a run-away burning reaction, this is In much the same way as wet wood needs so much extra heat to heat the water before it can get hot enough to self ignight  it that a fire tends not to keep going.


    Exact mixes and which mineral fillers are probably a jealously guarded trade secret. They certainly blunt your wire strippers faster, and the ones with a lot of mineral are quite stiff.
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