In reply to chris687: You do have a couple of options:
Beal Antipodes 8mm semi-static -
http://www.beal-planet.com/2014/anglais/corde-antipode-8mm.html - this does NOT meet the normal standard for semi-static ropes however it does meets the French Caving type L standard for use by expert cavers. This is probably your best bet and only real option if you need an officially rated rope.
Beal 7mm dynema trail line -
http://www.beal-planet.com/2014/anglais/cordelettes.html - this has a very high 15kN strength but being dyneema (low melting point) and only available in 50/60m length this is probably not ideal.
HTH