Date:         Thu, 22 May 2014 16:09:47 -0700
Reply-To:     Stuart MacMillan <stuartmacm@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Stuart MacMillan <stuartmacm@GMAIL.COM>
Subject:      Re: Where do you get your coolant?
Comments: To: mcneely4@cox.net
In-Reply-To:  <20140522153045.5KPU3.356155.imail@eastrmwml206>
Content-Type: text/plain; charset="utf-8"

According to the bottle, no:  Sodium hydroxide, sodium nitrite, sodium tetraborate, and sodium mercaptobenzothiazole are, and all are hazardous materials.

Here is an interesting article on phosphate in antifreeze:
http://www.machinerylubrication.com/Read/841/coolant-fundamentals 

This fellow says high mineral concentration in European water was the main reason for eliminating phosphates.  They form compounds that precipitate when calcium and magnesium are present.  These deposits lead to corrosion underneath.

Stuart 

-----Original Message-----
From: mcneely4@cox.net [mailto:mcneely4@cox.net] 
Sent: Thursday, May 22, 2014 12:31 PM
To: vanagon@GERRY.VANAGON.COM; Stuart MacMillan
Subject: RE: [VANAGON] Where do you get your coolant?

Ok.  But I still wonder about the No Rosion, even though I will not be using it.  The reason for phosphate (phosphoric acid) in coolant is as a buffer.  As a "tribasic" acid, it has three available hydrogen ions for buffering.  Works wonderfully well.  Perchance, does No Rosion contain phosphate as the buffering agent?  Again, I have no reason to use it, I just am curious about its chemistry.  mcneely