There are two problems with PEX in the shop, one real one joke.
The joke one is PVC + UV = shrapnel, and frankly given enough time and vibration PVC doesn't need UV to shatter, so old timers hearing you're using plastic in the shop will freak out. (edited for those who don't get the joke: Pex will definitely split or crack under UV but AFAIK never shatters, so using PVC is a major OSHA violation but using unprotected Pex is mostly safe although maybe economically unwise)
The real problem is the melting point is unimpressive and you're like one lathe chip away from an air leak. Not catastrophic but annoying. Murphy's law is air leaks only happen when you don't have time to slap a new fitting on, or when your collection of fittings is empty/missing and the store closed five minutes ago.
Locally, we also have problems with rodents chewing threw unprotected pex. Probably because we rarely freeze, and unprotected really means completely unprotected.
There is a pex variant which consists of aluminium pipe with plastic layers on the inside and outside. This should combat low melting point of the plastic
The joke one is PVC + UV = shrapnel, and frankly given enough time and vibration PVC doesn't need UV to shatter, so old timers hearing you're using plastic in the shop will freak out. (edited for those who don't get the joke: Pex will definitely split or crack under UV but AFAIK never shatters, so using PVC is a major OSHA violation but using unprotected Pex is mostly safe although maybe economically unwise)
The real problem is the melting point is unimpressive and you're like one lathe chip away from an air leak. Not catastrophic but annoying. Murphy's law is air leaks only happen when you don't have time to slap a new fitting on, or when your collection of fittings is empty/missing and the store closed five minutes ago.