I am not sure exactly what you are asking for. But to clear up a little bit.
Spectra and dyneema
names for the same chemical compound. That chemical is only made by a company named DSM and is then spun into different products, everything from dyneema
cloth to spectra ropes, and sails
. The different SK-## have to do with the specific formulation of the chemical which have gone up in number as DSM refines the chemical formula and makes the fiber stronger.
Typically dyneema ropes loose a substantial amount of strength in the first 24 months of use, with a flattening curve over time. It will loose roughly 40% of strength in the first 24 months, and an additional 10-15% of the next 96 months. What is believed to happen is that the outer portion of the fiber gets damaged, but stays in place an acts like a sheath to protect the inner fibers. Based on 8mm sk75
While this may seen like a lot of line strength (and it is) typically dyneema is so oversized for strength that it just doesn't matter. As an example, in this case a piece of 1/64 dyneema line is probably strong enough to hold the boat up, everything passed that is just extra. In this case Dockhead is planning on using 6mm with a MBL of 8,500lbs. Which is so far in excess of the strength needed who cares if uv degradation drops it back to 5,000lbs? It is still hugely overbuilt and will rip the davits
off before the line fails anyway.
I keep trying to link to the MDS but fr some reason my iPad
is being temperamental and won't let me. It is on page 5 of the DSM Dyneema fact sheet entitled "Ultra High Molecular Weight Polyethaline fiber from DSM Dyneema".
The coating information is from Sampson and is specific to amsteel blue, which is a trade
name for SK-75 fiber with the Sampson coating Samthane S. The data on the coating comes from Sampson and is formulated for wear not UV. There may be a company making a braided line with a UV coating, but most people will replace the line for other reasons long before UV becomes an issue.