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Old 30-09-2020, 12:15   #16
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

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a. Was the snubber typically in the water or above? I'm assuming above.

The snubber is always below the water. The bridle is about 5 meters long so the eye will always be submerged.
From the length doesn't sound like it, but going the other direction, was the bridle ever able to get into the mud/bottom? Perhaps in a low oxygen environment (mangrove muds, that kind of place)? For a while (not much pull, boat drifting around)?
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Old 30-09-2020, 12:20   #17
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

I have a similar set up with a mantus bridle. The thimble would not fit through the bow roller design on my boat. Sailmaker/rigger at Shelter Bay suggested to remove the thimble and use a Bow shackle to the chain and eye. So far no issues, although I would like to try to use dyneema in place of or as a backup to the shackle.
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Old 30-09-2020, 14:48   #18
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

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Thank you for the reply. This is still baffling, since chafe of this type is unknown, and Dyneema is in very wide use. Certainly, this is the result of something other than simple chafe. The pattern is wrong and the stainless is (appears to be) rough and rusty, which does not add up, not one bit. There are skips in the wear, which does not happen with chafe. I think it is obvious that there is some other factor involved, either odd metalurgy, a surface hardening effect (I've seen this is cold rolled steel) or something electrochemical, but for now it is a mystery. I'm leaning towards some factor relating to how the steel was rolled and formed.



Did you observe this happen slowly, at a steady rate, over a period of years, or did you notice it only recently?

The bridle is a Mantus bridle and while I've not tested it, I assume the thimble is a good quality stainless (like all Mantus products). There are three groves, one shorter than the other two. The grooves go clear around from one side, through the eye and equally down the other side of the thimble.

The thimble may have been in the mud/sand at various times. Our keel is 2.1 meters so we prefer to anchor places where we have a t least 5 meters at LAT - but sometimes you have to take what you can get.

We've on eh hook almost constantly the past three years. I noticed this first time about 18 months ago - back then there was only 1 groove.

I have noticed no grooves etc in the chain. When examining it, it almost seems as if the Dyneema pushed its way into the steel - there is a slight raised ridge on the side of the grooves.

While I admit that we have anchored in some pretty heavy swells/weather - it probably wasn't heavy enough to simply pull the Dyneema into the thimble
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Old 30-09-2020, 15:24   #19
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

get rid of that thimble. i use soft shackle from 6 mm dyneema (as big as it can go thru chain) and attach to rope directly. The rope loop is very tight so there is no movement.

Works that way 6 years and 0 chafe.
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Old 30-09-2020, 15:40   #20
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

That looks to me more like corrosion than chafe. I suspect that the shackle may not be 316 either--try it with a magnet--.

But 316 is not corrosion resistant either in some circumstances.
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Old 30-09-2020, 16:18   #21
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

A couple of possibilities spring to mind.



When the anchor is out of the water presumably the wet salty dyneema is sitting in air against the thimble possibly for several days at a time. This would be conducive to crevice corrosion particularly if it is a lower grade stainless. Note that a magnet will not tell you the quality of a stainless, I have seen stamped 316 which is almost as magnetic as iron.


The other thought is that thimbles are usually used to protect a rope from chafe against a shackle or similar hard object. Using it to connect two ropes like this is unusual.The rope going around the thimble is spreading its load over a large surface. The dyneema is putting exactly the same load on a very small portion of the thimble.

Now if that dyneema contained a few grains of sand the constant pull then relax, then pull and relax all night on one small spot might just be enough to abrade the stainless. The chafe pattern would not be a normal groove because the sand would be moving around in one position not running past as is commonly seen in chafe so the chafe pattern would not be a smooth groove
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Old 30-09-2020, 16:55   #22
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

I have worn out an anchor from too much wear from the anchor to shackle, eventually there is no metal on the anchor left. I know it sounds crazy but this happened to me after 10 years of anchoring, and the anchor itself had zero galvanization left and flakes of metal falling off it.

Now I wrap all around the anchor in the hole where the shackle attaches with dyneema twine so that the shackle does not wear the anchor, maybe not the best way, but so far it's working.


Does anyone put zincs on their anchors?
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Old 01-10-2020, 05:30   #23
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

Is the chain galvanized or stainless?
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Old 01-10-2020, 10:13   #24
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

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Is the chain galvanized or stainless?
The chain is galvanized.
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Old 01-10-2020, 12:34   #25
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

Gentlemen that looks like pitting corrosion and would be covered under our warranty.... We will reach out to the customer and replace his bridal.
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Old 01-10-2020, 23:05   #26
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

Wow! Good on you, Greg, and Mantus Anchors.

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Old 01-10-2020, 23:43   #27
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

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Gentlemen that looks like pitting corrosion and would be covered under our warranty.... We will reach out to the customer and replace his bridal.
Greg
Now that is good old fashioned service, well done Mantus and Greg
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Old 02-10-2020, 04:00   #28
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

This, the topping lift topic that snapped twice.

I was going to replace my topping lifts with it, not so sure now, thinking dyneema might be best used for emergency standing rigging etc repairs, and on racing boats that go in a closed garage when not in use.
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Old 02-10-2020, 08:50   #29
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

Just to let you all know. Greg wrote to me yesterday and said it was a warranty issue. I told him I was NOT complaining - the bridle still works fine and I'm happy with it.

This morning when I got up, there was a message in my email that Mantus had already shipped a new bridle to me.

I have to say that in this day and age, finding a company that stands this solidly behind their products is (unfortunately) very rare.

I cannot say enough good things about Mantus (and their products, of which I own several).

Greg - My hat is off to you - few manufacturers would do this of their own volition.
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Old 02-10-2020, 19:39   #30
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Re: Can Dyneema Chafe through Stainless Steel? Yes!

Thank you!
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