SM50 --what do you use it for?

[TonyL]

According to its government Safety Data Sheet, SM 50 is oxidised castor oil and molybdenum disulfide powder - no silicone involved. Odd perhaps, but castor oil was the main lubricant for rotary aircraft engines back in the day (to the predictable detriment of aircrew sitting behind them).

https://farmcottagebrands.com/wp-con...nLube-SM50.pdf

A knowledgeable friend told me Beeman's "Ultra Lube" (my personal favorite for leather seals; jealously hoarded as it's extinct) was simply re-packaged SM 50 (which is impossible to find in the US). I would love to get some in hand!

I never knew that, it makes a lot more sense now. Abbey used to sell a liquid silicone lube so ‘Silicone Gun Oil 35’ I thought it was a molybdenumised version of that.

So did I Hsing-ee!

Thanks Mike - that is a fascinating snippet of information.

John

I never knew that, either. Thank you for sharing.

By the way, the SM50 and Silicone Gun Oil 35 are available from our sponsor, as well as so many other useful products.