I mainly ask for a rough educated guess based on some science.... My boat came with 9mm dynex dux synthetic stays which have a breaking strength of 27k lbs. I was mainly curious about what the "safety factor" is to account for some possible unforseen abrasion on the synthetic stays.
Keep in mind that safe working loads for ropes are 20% of the breaking load, while 50% is a common figure for stainless steel. If you want to know how much excess SF you have, just compare 20% of 9mm Dynex breaking strength with 50% of 8mm SS wire breaking strength.
Whatever the results, your splices must be checked for abrasion frequently anyway. Kids may cut the rope, dogs may like their taste, etc. One never knows.
If you still have any doubt, just ask directly to Mike Leneman, Eric Precourt or Ian Farrier. They know this stuff well.
