limited use of tungsten disulfide?

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Oct 30, 2021
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In grease, why is tungsten disulfide not used by any large companies as a friction reduction additive? I can only find small companies that use it.

Here are a couple of the small companies I found that use tungsten disulfide in their greases:
www.nanoslicklubricants.com/low-friction-lubricant/

In grease, why is tungsten disulfide not used by any large companies (like Mobil, Castrol, Chevron, etc.) as a friction reduction additive?
Besides additional cost, is there something technically negative about tungsten disulfide that these large companies discovered that the small companies have not?
 
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probably its expensive to market a product with this ingredient, as it may be a specialty product, there are other comparable grease additives that seem to work fine in most situations and are more common ,as for the performance overall it's hard to tell depending on the application.
 
I suspect it comes down to cost. I use tungsten disulfide in the Silca bicycle chain wax lube "Super Secret Bike Lube" and it works terrific. Great lubrication, and doesn't attract dirt and grime. BUT it is $8 an ounce!
 
I suspect it comes down to cost. I use tungsten disulfide in the Silca bicycle chain wax lube "Super Secret Bike Lube" and it works terrific. Great lubrication, and doesn't attract dirt and grime. BUT it is $8 an ounce!
I'm curious as to how a bicycle chain creates the pressure (temperature) to cause the tungsten disulfide to exfoliate or "bloom" and act as an EP additive. At the reported exfoliation initiation temperature, the wax would melt and run off, evaporate and leave deposits.

Maybe at low temperatures the WS2 acts as a friction modifier without heat initiation.
 
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