Barbara Lewis on tue 12 aug 97
Dear all: Could we talk about saggar-firing? I have been saggar firing for
about three years, bisquing at cone 010, saggar firing to cone 06 (outside
temperature of saggar). Saggar is built of hard brick saggar in updraft gas
kiln, mortaring between bricks with paperclay (sometimes I think I use that
stuff for everything except hair gel!). Mortar between bricks controls
blacks created from the burning of sawdust in the kiln. If I don't mortar,
black take over all color. Surround pots with vermiculite dampened with
copper sulphate and iron sulphate. Put sawdust in around top of piece
usually (neck). Wrap banana peels around pots with copper wire. Would
anyone like to share their experiences with saggar firing? Does anyone
bisque at a higher temperature? Anyone used cobalt sulphate? To know more
than you ever wanted to know about me and to see pots:
http://gwis2.circ.gwu.edu/~lewisba/index.html
Sorry this site is old. Had to do it for a class last summer and want to
revamp it, but have not had the time. Barbara
Nils Lou on wed 13 aug 97
Saggar firing can give wide variety in standard kiln firing. I am using
ceramic fiber board riser sleeves with M-board for lids. Sprayed inside
and out with ITC 100. The riser sleeve adds little heat load and gives a
good seal. hard bricks absorb about 3600Btu's each brick per hour! Sleeves
come in wide variety of diameters, each 12 " high. Double if necessary.
Re-use over and over. make good raku kilns too. Made by Thermal Co. Good
source is FireBrick Supply, St. Paul MN. 1-800-444-3301 ask for Dona. Tell
her Nils sent you...
On Tue, 12 Aug 1997, Barbara Lewis wrote:
> ----------------------------Original message----------------------------
> Dear all: Could we talk about saggar-firing? I have been saggar firing for
> about three years, bisquing at cone 010, saggar firing to cone 06 (outside
> temperature of saggar). Saggar is built of hard brick saggar in updraft gas
> kiln, mortaring between bricks with paperclay (sometimes I think I use that
> stuff for everything except hair gel!). Mortar between bricks controls
> blacks created from the burning of sawdust in the kiln. If I don't mortar,
> black take over all color. Surround pots with vermiculite dampened with
> copper sulphate and iron sulphate. Put sawdust in around top of piece
> usually (neck). Wrap banana peels around pots with copper wire. Would
> anyone like to share their experiences with saggar firing? Does anyone
> bisque at a higher temperature? Anyone used cobalt sulphate? To know more
> than you ever wanted to know about me and to see pots:
> http://gwis2.circ.gwu.edu/~lewisba/index.html
>
> Sorry this site is old. Had to do it for a class last summer and want to
> revamp it, but have not had the time. Barbara
>
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