Very interesting and potentially useful. But I do have a very elementary question - just what is an MPa? i rather imagine 138 MPa is stronger than 20 MPa, but probably not as good as 50,000 MPa. Cast iron and bone are not what I think of as having particularly notable tensile strength (at least the old bones with which I deal).

Heat shrinking sounds interesting. I wonder how many strands of this cordage I would need to plait together in order to get a rope that would meet UIAA specs?