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Not sure if this is accurate, and not completely sure what it means, but I found this on a Google search:
What is the difference between freeze point and burst point of antifreezes?
A. The freeze point is the temperature of the solution where ice crystals will start to form in the solution and it will have difficulty flowing. This temperature is around +10° F with -50 RV Antifreeze. This temperature is not indicative of the winterizing protection. RVers need to be concerned about the burst protection. The burst point is the temperature where the solution will begin to expand and thus cause the pipes to burst. A unit winterized properly with -50 RV Antifreeze should show a freeze point of around +10° F, which indicates a burst protection of -50° F.
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