On Jul 15, 12:36*pm, Gas Bag wrote:
I’ve got a query relating to glass surfaces. *I’ve noticed that
glaziers can fit special non-reflective glass to picture frames. *I’ve
felt the surface of this special type of glass, and it is very very
slightly rough. *It is perfectly clear and the picture can be seen
perfectly, but there is no glare or reflection visible.
I wanted to know whether or not this special type of non-reflective
glass "fogs up" in warm humid conditions. *Perhaps the slightly rough
surface may prevent condensation forming? *If a mixture of ultra fine
glass bead powder and clear acrylic lacquer (and lacquer thinners) was
sprayed evenly on a glass surface, this would result in a very fine
rough surface. *Could this possibly prevent fogging/condensation on
the surface?

Rough-surfaced glass isn't glare-free: it just distributes the glare
over a larger area, making it less obnoxious. And I doubt it has any
effect at all on condensation. Anti-reflection coatings do a better
job of glare-reduction.

"Fog-free" mirrors are very, very thin and lightweight: the intent is
that they will always be at the same temperature as the air and
therefore moisture won't condense on them. They work so-so.

"Anti-fog" treatments for glass apply a thin, waxy layer to the
surface which is highly hydrophobic (e.g. "rainex"). This works better
if the surface is rough, too (on the right scale). This may be what
you were getting at, but I am not aware of any permanent treatments of
this type.

Jim Deutch (JimboCat)
--
"I meant it kept the rain off the face , which umberallas dont do very
well because mainly the rain in the Northern Hemisphere falls at
greater angles the further north you go" -- Habshi