Ah. the misinformation flies around here. A lot of this discussion is correct, but there are a few misconceptions here.
First, it is partly correct that you need a "license" to buy R-12. What you need is an EPA certificate. This amounts to attending a class and taking a test. Passing grade on the test gets you an EPA certificate. This certificate is required to legally buy R-12.
Second, price. Depends on where you get it. It is still somewhat available to buy until supplies are exhausted. New production in this country stopped a long time ago. Price includes heavy taxes imposed by the EPA to discourage use of R-12. Price depends on things like age of inventory, locality, etc. Private sales are largely unregulated.
Third, use of R-12 is NOT restricted to systems that "need to be kept original" so to speak. Any system designed for R-12 CAN use it legally. Most times, availability and price determine whether to convert to R-134a.
Lastly, my opinion. A semester spent in General Science class will account for the dreaded "hole in the ozone" that is being blamed on R-12. Science indicates otherwise. Also, a ten minute look at the periodic table of elements and some basic chemistry seems to counter the idea that heavier than air compounds like R-12 are damaging the atmosphere 8 miles high. Everything I learned tells me that the heavier compounds sink - not rise to the top. And, the REAL reason for the phasing out of R-12 in my opinion is the expiration of DuPont's patents. Follow the money.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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