How Pottery Is Fired

Firing is the process by which shaped clay is transformed into durable ceramic.

 

In a kiln, vessels are heated to high temperatures — often above 2,000°F — that permanently alter the clay body. At sufficient heat, the particles in the clay fuse together in a process known as vitrification, creating a strong, non-porous material suitable for daily use.

 

Different firing methods — including wood, gas, and electric kilns — create distinct atmospheric conditions inside the kiln. These conditions influence surface, color, and subtle variation in the finished piece.

 

Within Japanese ceramic traditions, firing is often understood not simply as a technical step, but as a collaboration between maker, material, and heat.

 

Firing: Transformation and Atmosphere

 

When clay enters the kiln, it changes irreversibly. Moisture burns away, minerals react, and the structure of the clay body tightens and strengthens. What emerges is not merely dried earth, but ceramic — resilient, stable, and capable of daily use.

 

At Hashi, all of the pottery we carry is fired to temperatures that fully vitrify the clay. This durability comes from the clay body and firing temperature working together to determine how completely the vessel has transformed. The result is pottery suitable for food use and for regular handling, including dishwasher and microwave use unless otherwise noted.

 

While the technical goal is durability, the aesthetic results vary depending on how the kiln is fueled and managed.

 

Wood Firing

 

In wood-fired kilns, flame and ash move freely through the chamber during firing. Ash settles on surfaces and melts into glaze or bare clay. Variations in heat and airflow create natural shifts in tone and texture.

 

Because the kiln atmosphere is dynamic, no two wood-fired pieces emerge exactly alike. Subtle gradients, flashing marks, and ash deposits become part of the finished surface.

 

You can explore our Wood-Fired Pottery collection to see how this method shapes surface and form.

 

Gas Firing

 

Gas kilns allow the maker to influence the atmosphere within the chamber by adjusting airflow and fuel levels. This can produce subtle variations in tone, warmth, and surface depth.

 

Gas firing often balances control with responsiveness. While the environment is more regulated than in wood firing, the kiln still participates in shaping the outcome.

 

 See how this method creates nuanced surface effects in our Gas-Fired Pottery collection.

 

Electric Firing

 

Electric kilns provide consistent and even heat. Their stability allows potters to refine glaze results and achieve clarity in form and surface.

 

Though often considered more controlled, electric firing can still produce variation through glaze chemistry and careful temperature management. Many contemporary potters use electric kilns to pursue precision while remaining attentive to material.

 

Discover how this method supports refined and deliberate surfaces in our Electric-Fired Pottery collection.

 

Frequently Asked Questions

 

What is vitrification?

Vitrification is the process by which clay particles fuse together at high temperatures in the kiln. When fully vitrified, the clay becomes strong and non-porous, making it suitable for daily use.

 

Is the pottery food safe?

Yes. All of the pottery at Hashi is fired to temperatures that fully vitrify the clay, making it appropriate for food use and durable for regular handling, including dishwasher and microwave use unless otherwise noted.

 

What is the difference between wood, gas, and electric firing?

The primary difference lies in the atmosphere inside the kiln. Wood firing introduces ash and natural variation. Gas firing allows controlled atmospheric adjustments. Electric firing provides steady, even heat. Each method influences surface and tone in distinct ways.

 

What is raku firing, and is it food safe?

Raku is a firing method often associated in the United States with dramatic crackle patterns and metallic surface effects. Because raku pieces are typically removed from the kiln at lower temperatures and cooled rapidly, they are often porous and not suited for food use. At Hashi, we prioritize pottery intended for daily use, so we rarely carry raku-fired work unless it is clearly designated as decorative.

 

For a firsthand account of the experience of firing a wood kiln, see our Notes on Firing.