Looking for cord type material for use in a refigerator

Hi,

Apologies if this isn’t precise, I’m working on an idea but as yet not 100% sure
of which way to go.

Are there suggestions for a cord (or possibly string) type material for use in a refigerator (both chiller or freezer compartments)? i.e to withstand cold, ice,
& some of the condensation you can get in 'fridges?
Also Flexible & durable. Diameter in the range 3mm to 8mm.

Stretchable & dishwasherproof would be bonuses.

First resource of industrial designers; ThomasNet http://www.thomasnet.com/

electrical cords >
http://www.thomasnet.com/prodsearch.html?cov=NA&which=prod&what=electrical+cords&navsec=search

low temperature electrical cable >
http://www.thomasnet.com/prodsearch.html?cov=NA&which=prod&what=low+temperature+electrical+cable&navsec=search

Thank you.