On 22/12/2017 14:09, Caecilius wrote:
On Fri, 22 Dec 2017 13:16:31 +0000, Max Demian
wrote:

On 22/12/2017 13:03, Caecilius wrote:
On Fri, 22 Dec 2017 12:17:07 +0000, Vortex13
wrote:

Used undiluted it claims protection to -20C

50% dilution claims protection to -7.5C

How does that work then?

It's probably a mixture of alcohol and water. The alcohol is probably
methanol, as that's the cheapest alcohol available.

I would have thought that methylated spirit is cheaper (ethanol with
around 7.5% methanol). (I used to add meths to my washer bottle, which
coloured the plastic purple.)

I think methanol is the cheapest at the industrial level, but I might
be wrong.

I wouldn't use meths myself, as I don't like the pyridine smell, and I
suspect that it would rot the windscreen wiper blades.

That's only in the purple "domestic" stuff, proper "Industrial Meths"
doesn't have it.