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Dear Amarin,
Hope you're well. The Teflon-loaded sprays I use are made by DuPont or Black&Decker. I've used these for over 30 years. None has been problematic as a lock lubricant.
The article, to which you kindly posted a link, is most interesting. It focuses on use of Teflon in engine lubricants, i.e., in a very harsh environment. There, a poorly-engineered lubricant not only fails, but can do great damage.
I think the problem with the graphite-loaded lock lubricant I used had to do with the oil, used to get the graphite to where it was needed.
Most oil-based lubricants "gum" at low temperatures, i.e., at about -50⁰F (-46⁰C. Teflon-based lubricants maintain lubricity to temperatures lower than any found in the environment, i.e., to -240⁰F (ca. -150⁰C).
In short, Teflon-based lock lubricants have served me well, in a temperate climate. I cannot say how they'll perform where ambient temperatures are far higher. As locks are not a "high stress" environment, though, I've no reason to think that a well-engineered Teflon-based lubricant will be problematic.
Hope this helps.
Yours faithfully,
Spook
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