Dennis Mcavoy on mon 10 sep 07
Hi All. I am investigating spraying to apply glaze. I know it is important
in glaze preperation in general to control the specific gravity but what
about the viscosity? Is the viscosity as critical in glaze preperation for
spraying as it is in preparing slip for casting? For control of the
process it seems like it might be critical. Thanks for your thoughts and
inputs. Dennis
Dave Finkelnburg on mon 10 sep 07
Dennis,
Viscosity control is necessary only so much as it
permits a glaze to be sprayed. The higher the
viscosity, the more air pressure you will need in the
sprayer. As you know, as glaze density increases,
glaze viscosity also increases if the only change is
the ratio of water to dry solids. So, as you remove
water from a glaze for spraying you probably want to
deflocculate the glaze to reduce viscosity. This
requires testing, of course, because you need to
balance density and viscosity so a glaze is sprayable
but doesn't settle out.
Good glazing!
Dave Finkelnburg
From: Dennis Mcavoy
Hi All. I am investigating spraying to apply glaze. I
know it is important
in glaze preperation in general to control the
specific gravity but what
about the viscosity? Is the viscosity as critical in
glaze preperation for
spraying as it is in preparing slip for casting?
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John Rodgers on mon 10 sep 07
I've done a lot of spraying of glaze, but never found the need to worry
about viscosity particularly. I have even sprayed with plenty of CMC in
the glaze - which really ups the viscosity - but it was not for the
purpose of control of viscosity, but rather for the hardness of the
glaze when dry for handling purposes and for the adhesion to the surface
of the bisque - or the surface of an already matured glaze. I typically
spray enough coats to build a "fur" appearance on the surface. That
works well for me.
regards
John Rodgers
Chelsea, AL
Dennis Mcavoy wrote:
> Hi All. I am investigating spraying to apply glaze. I know it is important
> in glaze preperation in general to control the specific gravity but what
> about the viscosity? Is the viscosity as critical in glaze preperation for
> spraying as it is in preparing slip for casting? For control of the
> process it seems like it might be critical. Thanks for your thoughts and
> inputs. Dennis
>
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