Typical composition (ppr) of natural rubber used for off-shore/marine applications

[karakuli]

I've searched through countless websites/papers/data sheets, but I'm having trouble finding even the approximate composition of natural rubber that is used in commercial off-shore/marine applications. I think probably, because it's proprietary information. I need the ppt information, so we can order some test samples. But I'm a mechanical engineer, and my knowledge of rubber is not as deep. Anyways, I would be really interested, if you have some ideas or could point me in the right direction.

Thanks in advance!

 

[GrahamBennett]

Off shore and marine applications usually involve the oil/gas industry. Natural rubber is unsuitable in these applications because of its poor resistance to oil.

 

[btrueblood]

Nat. rubber has poor resistance to salt water/weathering and sunlight too. EPDM has resistance to those, but not to petroleum. Nitrile has middling resistance to sunlight/weathering, and good resistance to petroleum. Viton would probably answer to all of them, but is the most expensive.

 

[stancom]

NR may be suitable for some uses where oil resistance is not critical, but we really do need to know what the intended application is and we need at least an outline specification. Marine applications include offshore rig bushes, shock cells, bearings and seals although NR would not feature in all of them.

One UK research enterprise with expertise in the field is MERL at Hitchin, now known as Element Hitchin following its acquisition by Element Materials Technology.

 

[karakuli]

Thank you for all your responses.
Sorry, I wasn't clear. The application is for offshore wind turbines, so accounting for petroleum is not necessary.

 

[GrahamBennett]

Can you be more specific please Karakuli? Which part of the turbines? Will the rubber come into contact with mineral oil or grease?

 

[karakuli]

They will be part of the support structure, fully submerged in sea water. Minimal contact with grease and oil. Thanks!

 

[btrueblood]

Sounds like it might be a good spot for EPR/EPDM.