> As a chemist I would strongly discourage the use of hyrdofluoric acid on a building site.
Think I'd agree there :)
Acids eat lime, liquefying it, they dont harden it.
NT
--- In papercreters@yahoogroups.com, "Niel Malan" <niel.malan@...> wrote:
>
> On 18 May 2010 at 13:43, germeten wrote:
>
> > Another post mentioned it; dilute hydrofluoric acid added to mixes or
> > as a wash, should strengthen and harden lime & gypsum cretes quite a
> > bit, because fluoric acid will bind with calcium to form fluorite
> > crystals, the same kind that strengthen your teeth & bones.
>
> No, you got it wrong. The mineral in teeth and bones is hydroxyapatite, not fluorite. Fluoride
> does turn hydroxyapatite on the surface of the teeth into fluorapatite, which is harder, but
> more importantly, more acid resistant. Fluoride has practically no other biological role.
>
> As a chemist I would strongly discourage the use of hyrdofluoric acid on a building site.
>
> Niel
>
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)
<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
