Sausalito Dinnerware Factory Tour

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By Heath Ceramics
Welcome to our virtual tour

Every aspect of our tableware production, from clay-making to kiln-firing, is done right here in our Sausalito factory. The building was built in 1959 for Heath Ceramics. It was designed by the mid-century architecture firm Marquis & Stoller in collaboration with Edith Heath.

Sausalito Dinnerware Factory Tour - Photo 1 of 35 -

Peak into our factory

Sausalito Dinnerware Factory Tour - Photo 2 of 35 - See how we make our dinnerware.  

See how we make our dinnerware.  

Making Heath Clay

Sausalito Dinnerware Factory Tour - Photo 3 of 35 - All of our clay is made on-site. It’s mixed with water, extruded, and cut into pieces in preparation for the forming area.  

All of our clay is made on-site. It’s mixed with water, extruded, and cut into pieces in preparation for the forming area.  

Forming a Bowl

Sausalito Dinnerware Factory Tour - Photo 4 of 35 - This process is called manual jiggering. An inner profile of a form is pulled down and spreads the clay into a rotating plaster form. Water is sponged on to each piece to smooth the surface. Our automated jigger machines make bowls by spreading clay into a spinning plaster mold.

This process is called manual jiggering. An inner profile of a form is pulled down and spreads the clay into a rotating plaster form. Water is sponged on to each piece to smooth the surface. Our automated jigger machines make bowls by spreading clay into a spinning plaster mold.

Forming a plate in the 1950s

Sausalito Dinnerware Factory Tour - Photo 5 of 35 - This in an archival photograph showing a plate being formed in the 1950's on a manual jiggering machine.

This in an archival photograph showing a plate being formed in the 1950's on a manual jiggering machine.

Forming a plate today

Sausalito Dinnerware Factory Tour - Photo 6 of 35 - This plate is formed on an automated jigger machine. It will remain on the mold until it dries.

This plate is formed on an automated jigger machine. It will remain on the mold until it dries.

Mold making

Sausalito Dinnerware Factory Tour - Photo 7 of 35 -
Sausalito Dinnerware Factory Tour - Photo 8 of 35 - Using a wax cast to craft the custom molds.

Using a wax cast to craft the custom molds.

Slipcasting complex forms

Sausalito Dinnerware Factory Tour - Photo 9 of 35 - More complicated and hollow forms are made by slipcasting. Liquid clay (called slip) is poured into plaster molds (that we make on-site). The clay dries for 20-30 minutes, the remainder of the liquid clay is poured out and a "wall" of clay that has already dried remains. Considerable work is still needed to finish the piece as the mold leaves lines of clay "flash" on the piece, and a lot of skill is required to make it look as the design was intended to look. 

More complicated and hollow forms are made by slipcasting. Liquid clay (called slip) is poured into plaster molds (that we make on-site). The clay dries for 20-30 minutes, the remainder of the liquid clay is poured out and a "wall" of clay that has already dried remains. Considerable work is still needed to finish the piece as the mold leaves lines of clay "flash" on the piece, and a lot of skill is required to make it look as the design was intended to look. 

Pouring slip into the molds

Sausalito Dinnerware Factory Tour - Photo 10 of 35 - Liquid clay (slip) is poured into the mold until it fills to the top. After a wall thickness dries, the remainder of the slip is poured out, and can be reused in the next pour.

Liquid clay (slip) is poured into the mold until it fills to the top. After a wall thickness dries, the remainder of the slip is poured out, and can be reused in the next pour.

Removing cast forms from mold

Sausalito Dinnerware Factory Tour - Photo 11 of 35 - After sitting for about half an hour the clay is firm enough that the cast forms can be removed from the molds. More drying is required before the pieces can be trimmed.

After sitting for about half an hour the clay is firm enough that the cast forms can be removed from the molds. More drying is required before the pieces can be trimmed.

Slipcast vases drying

Sausalito Dinnerware Factory Tour - Photo 12 of 35 - The vases need to be trimmed and wiped in order to remove the mold seam.

The vases need to be trimmed and wiped in order to remove the mold seam.

Adding handles to cups

Sausalito Dinnerware Factory Tour - Photo 13 of 35 - Each handle is slipcast and the cups are jiggered separately. The cup handle is then applied by hand.

Each handle is slipcast and the cups are jiggered separately. The cup handle is then applied by hand.

Trimming

Sausalito Dinnerware Factory Tour - Photo 14 of 35 - After drying, the edges of the plates are trimmed.

After drying, the edges of the plates are trimmed.

Wiping

Sausalito Dinnerware Factory Tour - Photo 15 of 35 - Each piece is wiped with a wet sponge to smooth the surface.

Each piece is wiped with a wet sponge to smooth the surface.

Forming details

Sausalito Dinnerware Factory Tour - Photo 16 of 35 - Many details require an addition step. Here, a lid is pulled off the wet clay when it is being formed. This handle is for a casserole lid. There is no mold for this piece, so each finished lid has its own character.

Many details require an addition step. Here, a lid is pulled off the wet clay when it is being formed. This handle is for a casserole lid. There is no mold for this piece, so each finished lid has its own character.

Sponging

Sausalito Dinnerware Factory Tour - Photo 17 of 35 - After trimming, the final step before glazing is wiping down the piece with a wet sponge. This smooths the surface and gives it a hand-finished texture.

After trimming, the final step before glazing is wiping down the piece with a wet sponge. This smooths the surface and gives it a hand-finished texture.

Moving ware to glazing

Sausalito Dinnerware Factory Tour - Photo 18 of 35 - Trimmed pieces are placed on wheeled carts and moved to the next process. These pieces are trimmed, dry and ready for glazing.

Trimmed pieces are placed on wheeled carts and moved to the next process. These pieces are trimmed, dry and ready for glazing.

Raw materials, stored for glaze making

Sausalito Dinnerware Factory Tour - Photo 19 of 35 -

Ware ready for glazing

Sausalito Dinnerware Factory Tour - Photo 20 of 35 - Once dry, the ware is ready for glazing. We keep some stock of all our pieces in greenware (unfired) so that we have them ready to glaze when we need them.

Once dry, the ware is ready for glazing. We keep some stock of all our pieces in greenware (unfired) so that we have them ready to glaze when we need them.

Stored Greenware

Sausalito Dinnerware Factory Tour - Photo 21 of 35 - Ready to be glazed and fired, when needed.

Ready to be glazed and fired, when needed.

Glaze making

Sausalito Dinnerware Factory Tour - Photo 22 of 35 - We make all of our glazes in house. We mix and test the ingredients in preparation for our glazers.

We make all of our glazes in house. We mix and test the ingredients in preparation for our glazers.

Glaze testing

Sausalito Dinnerware Factory Tour - Photo 23 of 35 - Glaze tests are created by hand to determine the desired application and its gram weight.

Glaze tests are created by hand to determine the desired application and its gram weight.

Glazing

Sausalito Dinnerware Factory Tour - Photo 24 of 35 - Glaze is applied to the pieces by hand with a spray gun.

Glaze is applied to the pieces by hand with a spray gun.

Wiping

Sausalito Dinnerware Factory Tour - Photo 25 of 35 - Glaze is wiped off the edge of a piece to expose the clay underneath.

Glaze is wiped off the edge of a piece to expose the clay underneath.

Waiting to be fired

Sausalito Dinnerware Factory Tour - Photo 26 of 35 - Formed, trimmed and glazed pieces wait to be fired on a ware cart.

Formed, trimmed and glazed pieces wait to be fired on a ware cart.

Kiln loading

Sausalito Dinnerware Factory Tour - Photo 27 of 35 - The pieces are stacked like a puzzle, using kiln furniture, into our top-hat kilns.

The pieces are stacked like a puzzle, using kiln furniture, into our top-hat kilns.

Ready to fire

Sausalito Dinnerware Factory Tour - Photo 28 of 35 - One of two natural gas-fueled dinnerware kilns (called top-hat kilns) loaded and ready to go.

One of two natural gas-fueled dinnerware kilns (called top-hat kilns) loaded and ready to go.


Adjusting the temperature

Sausalito Dinnerware Factory Tour - Photo 29 of 35 - The kilns are adjusted by hand using valves and pressure gauges.

The kilns are adjusted by hand using valves and pressure gauges.

Firing

Sausalito Dinnerware Factory Tour - Photo 30 of 35 - The temperature is monitored with a pyrometer throughout the firing cycle.

The temperature is monitored with a pyrometer throughout the firing cycle.

Our Kilns

Sausalito Dinnerware Factory Tour - Photo 31 of 35 - Our kilns were custom built by Brian Heath, when the factory opened in 1959. Today we can fire approximately 400 pieces in each kiln per day. Our kilns fire for about 8 hours and reach a maximum of 2100 degrees. Each firing cycle takes 24 hours.

Our kilns were custom built by Brian Heath, when the factory opened in 1959. Today we can fire approximately 400 pieces in each kiln per day. Our kilns fire for about 8 hours and reach a maximum of 2100 degrees. Each firing cycle takes 24 hours.

Monitoring the kilns

Sausalito Dinnerware Factory Tour - Photo 32 of 35 - Pyrometric cones are placed throughout the kiln and used to monitor the 'cooking' time from inside the kilns.

Pyrometric cones are placed throughout the kiln and used to monitor the 'cooking' time from inside the kilns.

Finished ware

Sausalito Dinnerware Factory Tour - Photo 33 of 35 - Finished ware, just out of the kiln.

Finished ware, just out of the kiln.

Recycling scraps

Sausalito Dinnerware Factory Tour - Photo 34 of 35 - Scraps are mixed and worked back into useable clay.

Scraps are mixed and worked back into useable clay.

Enjoy!

Sausalito Dinnerware Factory Tour - Photo 35 of 35 - At last, our pieces are enjoyed by you in the comfort of your own home.

At last, our pieces are enjoyed by you in the comfort of your own home.