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Forum: General Sailing Forum

04-11-2019, 09:34

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

Indeed.

I use a cheap refractometer for this, which has scales for both ethylene glycol and propylene glycol. Like this: https://www.chemworld.com/Glycol-Refractometer-p/cw-gr1.htm

Note...

Forum: General Sailing Forum

04-11-2019, 08:04

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

That exactly corresponds to my understanding, and I never thought it was rocket science, but you never know -- we'll see what the chemical engineer has to tell us.

"Do not dilute" simply means...

Forum: General Sailing Forum

04-11-2019, 06:51

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

If you are a chemical engineer, then maybe you could explain to the good people here the mechanism which produces sudden loss of freeze protection if you dilute polypropylene glycol "even a little". ...

Forum: General Sailing Forum

03-11-2019, 11:58

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

Sure, but just because the outside air temperature momentarily reaches a certain level doesn't mean the temperature in your bilge will ever reach anywhere near that temperature.

I just came back...

Forum: General Sailing Forum

03-11-2019, 11:49

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

Why is the chart misleading? It's totally straightforward.

When I left my boat out for a whole winter some years ago (when I had my mast out for re-rigging), I winterized, and bought 100%...

Forum: General Sailing Forum

03-11-2019, 10:55

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

Where did you get that idea?

Propylene glycol is not quite as strong as ethelyne glycol (car antifreeze), but its antifreeze properties are most certainly not suddenly lost by "even a small...

Forum: General Sailing Forum

03-11-2019, 10:45

Replies: 46

Winterizing... Are These Steps Critical

Views: 7,510

Posted By Dockhead

Re: Winterizing... Are These Steps Critical

The average low temperature in Wilmington in the coldest month, January, is only -4.1C, with average high +4C. Is there really much risk of anything freezing inside a boat in the water in such a...

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