I'd like to regrease my roller brakes, because it started to squeak. There is dedicated Shimano Roller Brake grease available, but I'm curious what kind of grease it is really like, what it is made from and if there is any good equivalent, substitute or something with similar composition for general usage.
I know that this grease is supposed to be high-temperature-resistant and that's the main requirement, but has it another characteristics, that has to be taken into account?

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/fKsTg.jpg