I see this note on their silicone hose pages:
Note: This hose is NOT formulated for use in oil or fuel plumbing applications. It will handle an air-fuel mixture and will survive occasional spills and oil leaks, but it will not stand up to continuous exposure to liquid petroleum.
I'd have to try it to see, but have my doubts that it would last in the hot and caustic crankcase blowby gas and oil and their condensates PCV environment.
In what experimenting I did, I concluded that hoses for use in PCV use had to be formulated for that purpose. While silicone is the absolute best for coolant and, from my personal experience, very hot coolant (like turbo coolant outlet hose) applications, I don't know what the correct rubber formulations are for PCV, but I know that no hoses designated tor coolant that I tried held up for any length of time for PCV use.
EDIT: On looking at this page on Summit Racing: PCV Hoses and Tubes - Free Shipping on Orders Over $99 at Summit Racing
I see neoprene (Buna-N) mentioned in some of the descriptions. I guess that is the "secret" ingredient. And no doubt there are specific formulations of that that hold up better than others. I wonder how Viton would do.