One of the many styles of commercially prepared moulds |
An
alternative to buying moulds for slumping bottles is to use a sand
bed. You can place the bottle into the sand and roll it a little
from side to side to create a depression in the sand that then
becomes the mould.
I
use a fine sand (not builder's or garden) and coat it with alumina
hydrate (slaked alumina). I use about 1 part alumina to 5 sand, but
the mix is not critical, just enough alumina to coat the sand
particles. It can go directly on your kiln floor if you have an easy
way to pick it back up, as it is re-usable. Or you can put it in a
stainless steel tray or any open topped box that will withstand the
temperature.
Make your
depressions and then sprinkle or sift a fine layer of alumina over
the area - I use an old sock to hold some and dust it over the sand.
Then lay the bottle in the depression.
The
amount of sand impression you get is dependent on the temperature you
use - the higher, the more sand texture you get.
This
way of slumping bottles eliminates the need for a mould and it is
variable for different sized bottles.
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