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IMHO, Worthington or Bernz-o-matic Fat Boy cans are at least 95% r290 (HD-5 grade), pre-blended with up to 5% of propylene (r1270 aka Care 45), butane (r600), and/or ethane (r170) as an added bonus. If there's much more than .001% of non-condensible gas or water in the mix, it messes with the process at the propane plant and it won't liquify in their still. The only thing you have to worry about is the "stink oil", which a standard catch-all will catch on the way in. For $3 a quart, that's what I use with great success.
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BTW,
HD-5 Propane HD5 grade propane is "consumer grade" propane and is the most widely sold and distributed grade of propane in the U.S. market. HD5 is the highest grade propane available to consumers in the United States and is what propane companies ordinarily sell to their customers. What does HD5 propane mean in terms of specification to an ordinary consumer? It means that the propane is suitable and recommended for engine fuel use, which was the original purpose of the HD5 grade propane specification. HD5 spec propane consists of:
Minimum of 90% propane Maximum of 5% propylene - propylene is used in the manufacture of plastics Other gases constitute the remainder (iso-butane, butane, methane, etc.)