Thermal coatings

[Shannen Durphey]

I'm glad somebody's paying attention.

HF high enough strengths will dissolve glass.  Really bad stuff.

Interestingly. it's produced when moisture is left in an R134 filled
refridgerant system.  Ever see the grey/black "sludge" that comes from an
improperly filled 134 system?  Very bad.

It's also a component in some "industrial strength" wheel acid mixtures.  The
labels on these bottles are far from sufficient, IMO.  But it's there and can be
purchased by just about anyone.

Other than the Hydrochloric acid, the chemicals I get are very dilute.  

And yes, any acid should be treated with respect.

Shannen


Matt Henson wrote:
> 
> HF?  Yikes.. if anyone wants to use that stuff, go
> ahead.  Just make damn sure that you don't get in on
> your skin or the vapors in your lungs.  You should
> only use it in a fume hood. It won't hurt a bit but if
> you get enough, which isn't much, it will leech the
> calcium out of your bones and kill you.  Very very
> scary stuff.  We used it in a lab at Motorola.  I
> think that of all the chemicals that we used,
> including things like 96% fuming sulfuric, 99% H2O2,
> etc, the HF got the most respect.
> -Matt
> 
> --- Shannen Durphey <shannen at grolen.com> wrote:
> > I've also had experience with Techline coatings.  It
> > is very accurate to say
> > that "most enthusiasts just don't take the time to
> > coat the inside."  It is a
> > bit misleading to imply that not taking the time is
> > equivalent to being lazy.  I
> > agree that it does take considerable time to
> > properly prepare the parts and
> > apply the coatings, although I have found that
> > hydroflouric acid speeds the
> > process and pretty well etches any metal in my
> > engines sufficiently enough to
> > allow coatings to stick.  If I were coating headers,
> > I would use an acid tank
> > with an hydrochloric acid/water mix to soak the
> > parts in, and a pressure washer
> > to clean them.  I have done this in the past for
> > paint and the process cleans
> > the metal extremely well.
> >
> >
> > Shannen
> 
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