Re: Feeling nervous about my boat
I kept a sample outside all winter and watched as it got slushy, then hard as the temps dropped. Im nervous now.
Propylene glycol antifreeze will slush and even appear to freeze solid if it gets cold enough. The difference to your engine's safety is that while it's happening, the antifreeze is actually contracting, rather then expanding. From Camco:
Q. I had some -50 RV Antifreeze stored in my garage and I noticed it was frozen. Is your product defective?
A. No. Propylene glycol antifreezes are designed to provide burst protection to temperatures of -50? F or below. Ice crystals will start to form in -50 RV Antifreeze at temperatures around +10? F and will appear to be solid ice at around -10? F to -15? F. Propylene glycol based antifreezes continue to contract and will not expand until temperatures of -50? F are reached, thus providing burst protection for pipes. If you need a product that flows at the lower temperatures, a higher concentrated product such as Winter Ban -100 or our Ban Frost Marine Engine Antifreeze should be used.
