How do Polyurea grease thickeners work? How are they different from metal soaps?

[@crimsondiesel9929]

This is the content we need but dont deserve. Thank you good sir!

[@LubricationExplained]

Thank you for watching!

[@MauricioRamirez-zh5yv]

Amazing content, thanks

[@nsgirn]

Wonder what your experience has been with how polyurea interacts with lithium/lithium complex greases if they are mixed in an electric motor? I've seen conflicting information on whether they're compatible.

[@3o141622]

¡Gracias!

[@LubricationExplained]

no hay nada que agradecer!

[@limyiphun6142]

Hi MR LE! Would love it if you could make a video about 2 cycle oil/2 stroke oil. I used 2 stroke oil in my gas tank at 1:300 ratio ( 0.2L oil per 60L gasoline ) as detergent and UCL additive. I use the API TC, JASO FD, ISO-L-EGD rating not the TCW3.

[@LubricationExplained]

Great idea! I'll add two-stroke to the list.

[@JeiJei752]

@@LubricationExplained And why the castor oil is still around in two stroke racing oils.

[@johndavidwolf4239]

​@@JeiJei752 : One reason is that it works with alcohol, like E-85, which if all the components in the fuel system can handle it, will produce as much as 17% more power with only re-jetting.

[@mumtazahmed8099]

Excellent information. Can you help me to source Reformed Polyurea powder. Thank you.

[@sunilmehta1519]

Very well explained 👍It should have been still in more details, may be in future. 👍❤️

[@Icriedtoday]

I have a new John Deere tractor and wish for it to last decades. The manual calls for lithium greases on the driveline, but says that ideal is to use a polyurea grease. My question is: If the U-joints were lubricated at the factory with lithium, given the extreme difficulty in replacing or cleaning out the U-joints, should I forget even using a potentially incompatible polyurea?

[@LubricationExplained]

Good question! Personally, I’d stay with the lithium complex, especially if you’ve got a high quality product. The bug advantage of polyurethane is that the thickener is metal free, and therefore has really good oxidative stability. But the U Joints shouldn’t experience temperatures that are too high (relative to a lot of other industrial applications), so the grease should still last a while. From an equipment protection standpoint they’ll both do a great job.

[@Woodstock258]

I love this💕 this Rafe. Perhaps AIx complex thickeners in the future. Thank you

[@LubricationExplained]

Thanks Alex, I'll add it to the list!

[@ecmor282]

Hi, thanks for the detailed explanation of poly urea grease! I have 2 questions: Can I use this type of lubricant on my mountain bike? Does poly urea grease chemically attack plastic and rubber parts? Thank you very much!

[@LubricationExplained]

Generally, yes. Unfortunately the variation in chemistry of both plastics and rubbers are just as large as in lubricants, so there's no way to definitively say that they will be compatible. But in general use the answer is probably yes.

[@AguilaJR]

@@LubricationExplained I was told by Moog that the rubber on their ball joint boots are made with certain resistance to lithium grease. It's probably going to be okay if polyurea grease acts similar against rubber than lithium grease does.

[@KarolosAthens]

For electric motors and tripod CVJoint (about NVH phenomenon). Especialy blue colour from Japan.

[@LubricationExplained]

So yes, but with the caveat that the colour is just a dye that's put into the grease! Polyurea is not itself blue, and not all blue greases will be the same type!

[@mytech6779]

Poly urea is called for my lawn mower deck spindle bearings while lithium called out for all of the other parts. (A name brand mid to high tier home owner lawn tractor, not a commercial mower.)

[@Unknown-jl7mg]

can polyurea be the best for most uses? "one to rule all" for typical diy-er.

[@LubricationExplained]

Yes and no. A couple of cautions - often polyurea greases don't play nicely with other greases, so if you're trying to switch between say a Lithium Complex and a Polyurea you can sometimes run into compatibility issues. The other problem is that for a "general purpose grease" around the home / workshop / farm, you'll want a substitute for common EP greases. Polyurea thickeners don't play nice with EP additives, so they're often not great in those shock-loaded applications. Otherwise, they're a very good technology that performs well, with the caveat that they need to have been manufactured well.

[@MikeyAlbertin]

@@LubricationExplained I came back to this video. I saw a chart that has 2 types of polyurea thickeners. One was regular polyurea and another one was called polyurea shear stable. The shear stable one was compatible with a lot of other greases.

[@LubricationExplained]

@@MikeyAlbertin Yes! Sorry that was something I was trying to state with the "manufacturing quality" part of my answer. I should have spelled it out more clearly. Just to be clear though - compatibility between thickness does not equal grease compatibility. As mentioned in my earlier answer, the additive families of different greases can be quite different, and this can be what causes instability in mixes of the two.

[@MikeyAlbertin]

@@LubricationExplained I was just thinking the shear stable one might be a good choice cause of longevity. I have seen a lot of applications that get really neglected being re-greased over a period of time. The grease turns hard and the fittings usually will not except grease.

[@muhammadyansa4774]

Mr your feace book linek

[@imrannaseer9624]

Hii can you guide mae how to make crystal greases like in china , with pure transparency??

[@LubricationExplained]

I'm not really a grease manufacturing expert, so unfortunately I can't really say.

[@imrannaseer9624]

@@LubricationExplained OK can you help me to get in touch with someone who can also from where can i download e books related to grease if you can guide??

[@imrannaseer9624]

And can we use simple performed polyurea to bypass this toxic step??

[@aSpyIntheHaus]

5:47 Diurea! "When you're climbing up a ladder and you hear a sudden splatter, Diurea" "when you're half way up a tree and it runs down your knee, Diurea"

[@mikeadler434]

👍👍