This man really went down to the chemistry of rope fibres just for a video. I think we can all agree this man is goes above and beyond for us and he deserves more. Great video

Wasn't expecting a chemistry lesson in a climbing video but I absolutely love it. This is the type of in-depth detail I come for

I'm most impressed with Mammut that they would show these details out in the open like this. That should be the norm, but of course companies are reticent to show actual performance numbers of their products for fear of turning off customers from data that looks "bad" to untrained eyes.

Always impressed by these videos. It's difficult to go so much into detail, while still making it entertaining to watch. Also, kudos to mammut for being so open about what they do and allowing you to use their facility

Sometimes you come across a video like this and it restores your faith in the internet again and makes you double check you are subscribed.

As a engineer and a passionate climber I just love this video. This is really the type of research I‘m interested in.

Amazing Video! The effort you put into the videos shows. Thanks to Mammut for letting you go into their facilities, it is always great when companies are involved with the comunity

Crazy how much more confidence I got on my climbing equipment after watching your videos. That’s something about science huh! Great video!

I ended up buying a Mammut rope after viewing your last video, it was confidence inspiring to see that testing was actually being done. Thx!

Love your videos. Science and fun for safety climbing! Brilliant! Thank so much Mammut for this collab, from my point of view "meeting" the team and feeling the passion is the little difference that could make me choose Mammut over another brand.

Wow! Awesome! This is how a book must be written. Deeply detailed but simple and complete. Very nice to see a great collaboration from a branded lab on this kind of topics (why should i ever follow the instructions on my gear :-)).

Very interesting video! Would be interesting to know if wet rope fully recovers its strength when dried or if some of the water remains bonded to the polymer chains in the amorphous sections of the fiber.

I'm a North Wales based climber. We almost always are dealing with puddles of water around crags and our winters are more often than not, only cold enough to freeze at higher levels in the hills. So winter ropes can get a little wet before you reach the colder temperatures. Almost everyone I know who climbs here uses dry treated ropes outside and most have a short classic rope purely for indoor use. Having dragged my ropes through many puddles and muddy cracks and grooves (despite best efforts not to!) I will only ever use dry treated ropes here. A classic rope on a wet belay ledge low down will soak water up instantly just running through a puddle at lead climbing speed. Every pitch after that your rope weighs much more and pisses muddy water as it runs through a belay plate. On the odd occasion I've used (and seen used) classics outdoors here, every time they owner says they wish for a dry rope (or that they wish they remembered their dry rope!).

Man I don’t know how much time you put into this video, but the editing and layout is _AMAZING_

The production quality here is mental

Great video Ben. As always extremely intelligible and helpful. In my opinion, there is still room for thought and research regarding the long-term damage sustained by a rope from frequent wetting. For example, I am a caver. The environment in which cavers use their ropes is extremely humid. This includes almost one hundred percent air humidity as well as dousing the rope with water directly. We are used to this fact, and in general, the topic of the long-term impact of water is not often discussed. The way we use ropes creates much smaller loads than dynamic catches during climbing. In our case, it is only a question of moving along the rope by rappelling and climbing by ascenders. However, it is not excluded that a dynamic load may occur in the system in the event of anchor failure. I would be very happy if you could continue the discussion about the effect of wetting the rope. Especially when Mammoth are ready to help with expertise and equipment. If the long-term effect of frequent wetting of the rope is significant enough, this may necessitate more frequent replacement of the ropes and more strict monitoring of their use.

Another great video! I really love all the stuff you've been doing with Mammut and really nerding out on ropes. One small tip that would make your data presentation more clear would be to color code things. Like using light yellow for dry untreated and dark yellow for wet untreated, and light blue for dry treated and dark blue for wet treated. That way it's very easy to tell how the data is related in the plots. Keep up the great work though!

What a channel!.. Thank you for being there, testing those things for others. I hope each manufacturer carefully watches the results and does the same and even better testing in their facilities.

Your intro explains the rope really well at several different levels of abstraction. Wow! You are making hard look easy!

Thanks! This is an amazing amount of excellent information that took a lot of work and time! Thank you ever so much!!!

It's always a treat to see a new video. Thank you for your amazing efforts. It definitely shows in the quality of your content. Looking forward to the next highly informative video ❤

You really got into the climbing technology rabbit hole :) Good stuff!

Thank you for getting into the samllest detailes of things. It really helps to understand how it all works, and what to expect out of the gear!

Mammut gets a huge shout out for product transparency. This video is great! 💯

Haven't even seen the video yet but I can already congratulate you for your work which is constantly amazing

I think this is your highest quality video so far! So cool to see that you sre still steadily imrpoving the quality. One thought I have is that showing that the force the rope sees is greater in wet ropes doesnt mean the strength that the rope would break at would be lower, just that you'd be more likely to see that force. Pretty much the worst case would be a crazy hard fall with a fall factor greater than two, like if while belaying off a multipitch anchor the belayer takes hard to keep them off the belay ledge and the first and only piece rips, shock loading the anchor on a short section of rope. Maybe the climber is 4m above the anchor, and during the freefall the belayer takes in a bit over 1m of slack. Total fall factor would be (4+3)/3=2.3. I calculated the peak force for the mammut 9.5 classic I climb with and it'd be about 8.6kN for a 80kg climber. Based on your tests, a wet rope would then see just over 10kn, which is getting into worrying territory for a used rope, or a rope thats seen many falls that day. Brilliant practical stuff. Takeaways: wet rope catches will be harder and less comfortable, belay device performance will change, and even though wet ropes are almost always safe, there are realistic (but extreme) scenarios in which a soaked rope might make you reconsider.

These lessons are awesome, the climbing theory you didn't know you need. I also wanted to ask you if you've ever used a rope brush to clean the ropes (the helicoidal ones), it makes me wonder whether the dirt goes out or inside the rope. It looks cleaner but some micro particles maybe will be pushed through the outside layer

Thanks for neerding around. Tank's for the help to mammut. Seems like the engineers had there fun as well.

These videos are simply amazing! Thank you for all the time spent for these experiments!

I'm always impressed with these companies that respond to youtuber's e-mails, have transparency with their customers, and welcome these tests to create safer products.

It’s interesting, I’ve never thought of elasticity changes with rope getting wet, only weight. Using them in waterfalls is relatively common. With caving, we want our ropes to be static so maybe getting them wet is a good thing!

Dang, and I thought the Grigri physics ep was great!! Dude, you've outdone yourself with this one!!

Wow, the quality of your videos really is getting insanely good

This was incredibly informative and well executed. Chapeau!

It would have been interesting to test ropes that had been saturated and then allowed to dry first, and use this as a control versus the rope that was left to dry in the video.

Water being squeezed out of the rope probably absorbs some of the energy (pumping loss), which would reduce the force somewhat.

I have been wondering about this for such a long time. I'm so glad that this video went into so much detail!

I really enjoyed these videos, great work and very appreciated.

If I remember well, in an other video you said that a dirty rope would wear out faster. I was wondering if it was a good idea to machine wash a rope and if yes, how long would it take for it to dry enough for it to be safe? Would the water damage it even if it was not used while wet? Thanks for the science!

... and thank YOU for such great videos! Always a pleasure to watch and at the same time learng lot's of interesting stuff!

You really have a great way of simplfying these theoritical concepts! Awesome work, keep it up!

Some top level nerding out here, nice one!

This goes beyond climbing content. These videos are fantastic science education!

6:09 lmfao that lady is doing 50/50 on your questions.😂😂

loving this content

1:51 That was Epic! I've never seen such pride in a belly-flop!

Another great deep dive. Thank you! I really don't see why anyone would buy a non-treated rope that they will use outside. How many places can you climb outside where there is no risk of dirt, abrasion or water? Dry treated ropes help in all of these situations, and not just safety but lifetime of your rope.

I have a theory about the rope that has dried overnight (14:50). In tap water, as well as in rainwater, salts are always dissolved. These salts enter the rope with the water, and when the rope dries, they remain between the nylon fibers, increasing friction there. Another experiment would have been interesting: to test the experiment with seawater/saltwater. Once wet and once wet and dried. This way, a large amount of salt would remain in the rope.

Great job. You've really stepped up every aspect of your videos.

Great video as usual! Thank you :) Are there any plans to create a video about how to safely clean a route and what to do if you cannot finish it? Essential skill for newbies like myself. I am always nervous when I need to do that. I usually go for a method when you need an extra quickdraw or sling and a locking carabiner. What method would you recommend?

Great video. Thank you!

Excellent video as always

Ty for all of the content you have been putting out. As always, I think it's top notch!

As someone with some experience in 3d printing, i know how much water plastic can absorb from humidity, and im curious what happens if you dry the ropes fully, as in dehumidify the fibres themselves, and not just the water from between the fibres. (Also I'm not convinced that a rope would dry overnight without being in quite the warm draft)

It would be vital to know after how many falls a wet rope breaks compared to a dry one!

Awesome research and video

9:27 is amazing! Everyone is looking with awe. That's what science (should) be about, and same with climbing. Honestly, this is so inspiring. I just had to teach physics today and this is the vibe I try to share. Science is interesting and fun! And of course climbing as well!

Amazing video as always. So with all of this new information, do you still wash ropes? What about ones with dry treatment? Does the interval change?

Great video, super informative and well produced! Thank you! As others have mentioned, I would be intrested in the effect of washing on rope longevity. I have previously thought washing is actually good for the rope (since it removes small particles like sand and dirt that caus micro friction within the rope) - but how often can you wash it before it might potentially have an negative effect on the rope's structural integrity?

Again, a very enjoyable nerdy video ! Thanx for your work !

Increíble trabajo de producción y documentación 👏🏻👏🏻👏🏻

I really love those physics videos about what will change in certain conditions with your equipment. It really forms you to have more trust in it! Btw. maybe you have the time in the future for a video idea. It's about all the differnt manufactures giving you special carabiners for their belay devices, rather than just features the biner must have. Would be nice for you to have closer look what the fuse is all about ☺

Hi Hard Is Easy :) I love your content, I'm waiting for next one episode :)

High quality content, as always.

2:09 Hey, little info from puritian chemist. What you showed is single mer, which is a part of many (poly) mers. You can synthesize polymer by reaction between monomers, which are single molecules. (For Nylon 6 it is caprolactam it polymerizes in ring opening reaction)

Please, please, share the error bars!!! It is crazy that you do all the work with statistics and then do not claim the glory! ... Great content, btw!

Very interesting video !! Thank you for your amazing content !!

I’m loving your content so much lately!!! It’s always so well made and I learn something every time :) Sounds like can’t use the “it’s raining” excuse anymore 😂

Please keep it up, it’s super informative and inspiring! Thank u! 😁

Sorry, that i took two days to klick. I love your stuff! Keep up the great work❤

For the permanent damage test, I would have also liked to see the results of the dry rope the next day also, to compare if the dry rope would have shown any wear at all from the tests or account for any unseen variance

That belly flop had me CRINGING, like a guy watching another guy get hit with a little league bat 😂

Lovely and nerdy 😂 thank you Hard is Easy and Mammut

@14:15 I'm hoping you're not misreading the graph, I'm no expert at anything. However if you're only looking at the peaks doesn't that only represent the downforce? When you're considering the bounce what you're looking for is the upforce, while that might not be measurable with your setup you can simply look at the trough and determine how much time between rises occurred. Doing a napkin calculation looking at the graph it seems to indicate that you had twice the amount of time in between bounces. Which is actually greater than the 64% increase of bounce that you calculated. From 0.35 seconds to 0.7 seconds.

One mistery we could use some science: what makes your hands turn black wen belaying older ropes? Is it dirt? Is it wear of your gear? I also heard the theory that it is rope internal lubricant.

So how does the advantage of washing your classic rope weigh against the loss of elasticity even after drying it?

Great video!

One question that remains: Does a rope wear down if you wash it with water (when its dirty) due to the chemical interaction of fillaments with the water molekules? A test setup could look like: take new rope (untreated - no dry rope), soak in water, let it dry, test Underlaying question would be: better keep your rope a bit dirty but no water(-damage), or clean it from time to time

Adriana seems to be such a cool person!! Great video, thank you for your work Ben!

thanks for sharing all this knowledge.

Love your videos! A comparision on what Belay-Device you prefer on what kind of climb for what kind of person would be a great inside for me as a beginner climber

Thank you again and again for a great informative movie

New drinking game idea : watch a hardiseasy video and have a shot everytime Ben says "however" ! :) Great video !

so much love this videos and how quality of your presentation consistently increases. keep up the good work. Here's a twist on this topic: washing the ropes with detergents and their impact on longevity and performance ;)

This makes me wonder how canyoning would impact ropes? Ive definitely had ropes soaked for over 40mins but I would imagine abseiling wouldn't have the same impacts as climbing, would be super interesting

Intersting stuff, Scottish winter climbing is certainly one area where you are cimbing with fully saturated ropes (granted many people use icelines)

Great explication this is science in real expression (yes you could have more vars and test but make this help a lot) thanks!!! 🔥🔥

Great video. Does the rope getting water logged make it have permanent damage, or waterlogged and an impact is what creates the permanent damage? I ask because of the washing ropes.

Very interesting test !

Mountain Jesus got us covered! We must thank him tenfold!!!

Nice video! All the nerd bits and the science behind everything (from chemistry, to textile, to testing machines, to force graphs) is just awesome. It is very interesting to see that not only the intensity of the rebound is higher in wet ropes, but the frequency of it falls a bit too. Is this change significant? Is this because the wet rope becomes larger and it just change the frequency as it is for a pendulum? I would love to have the data base to play and run some models. Thank you again for the super high quality video ✨

I love your videos! Thank you for one more video!

Thanks Ben, amazing video that goes into the atomic structure of things! Mammut is super knowledgeable Company that does tye utmost for the sake of technological clarity; this is one of the reasons why a MAMMUT rope who I own makes me very comfortable once climbing! Thanks Mirko

@14:56 I think it is more accurate to compare to the 6th fall of the dry rope and not the first. It is clear that the 6th fall of the wet (now dry) rope is lower than the 5th dry

Great video !! Thanks a lot!!

Thanks. Very interesting. Question: How long does it take for a treated rope to dry back to its original performance?

Here's my questions for a follow-up experiment: 1) Does soaking a rope have an impact on performance, if the rope is allowed to dry fully before use? (In other words: can you avoid damage to your wet rope by drying it, or is it damaged regardless?) 2) How long does it take to fully dry a rope? I imagined you could test this by taking sets of 2 identical samples, saturating one of them and then letting them dry fully, before doing the comparative drop test. I have a suspicion that dry-treated rope might take longer to fully dry if the treatment prevented the water from escaping. Perhaps there's even a nice relationship between time needed to saturate and time needed to dry.

Great video, but as a chemist the single bonds to oxygen in some of the drawings of the amide carbonyl make me real sad. 🤣

👏👏👏 great video

Hello @HardIsEasy! How do kN compare to G-forces, and/or do they compare at all? Absolutely great video(s), and to all the haters/complainers: try to make this high-quality and free content yourself. ❤🧡💛💚💙💜