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<p>[QUOTE="Desertau, post: 9836655, member: 86775"]When I started ceramics in the early70’s most everyone was doing high fire or Raku with some other firing techniques that were less common like pit firing. Gas was the preferred fuel for the visual affect on glazes as most gas kilns have some degree of variability in the kiln atmosphere depending on how it’s loaded and fired. Electric kilns were reserved for bisque firing and special low fire decorations or where a gas kiln was impractical. As glazes developed that produce more interesting effects in neutral atmosphere firing more studios switched to electric and many home studios for the ease of setup and lower installation expense. Electric kilns are now very popular due to the advances in low cost computerized controllers that allow programming complicated firing schedules some with very specific for the production of crystalline glazes that are difficult or impossible to reproduce manually, they require a lot of ramps at specific temperatures and exact soaking times. Computer controllers allow setting it and forget about it until the kiln cools and is ready to unload and one button for many other preprogrammed firings.</p><p><br /></p><p>I’m not sure exactly when but mid fire became popular due to lower energy cost firing and because it is much easier to fire that heat range. High fire is cone 9/12 but cone 9/10 being the most frequently used high fire range 2300-2400f roughly but cone firing is more about work heat than temperature. Mid fire usually is cone 5/6 2000-2200 roughly depending on the firing schedule, more time longer firing more work heat lower actual temperature. You can tell mid fire from high fire by the sound made tapping the rim, high fire has a high pitched ring due to the clay body being vitrified mid fire has a duller sound because the clay is not usually completely vitrified.[/QUOTE]</p><p><br /></p>
[QUOTE="Desertau, post: 9836655, member: 86775"]When I started ceramics in the early70’s most everyone was doing high fire or Raku with some other firing techniques that were less common like pit firing. Gas was the preferred fuel for the visual affect on glazes as most gas kilns have some degree of variability in the kiln atmosphere depending on how it’s loaded and fired. Electric kilns were reserved for bisque firing and special low fire decorations or where a gas kiln was impractical. As glazes developed that produce more interesting effects in neutral atmosphere firing more studios switched to electric and many home studios for the ease of setup and lower installation expense. Electric kilns are now very popular due to the advances in low cost computerized controllers that allow programming complicated firing schedules some with very specific for the production of crystalline glazes that are difficult or impossible to reproduce manually, they require a lot of ramps at specific temperatures and exact soaking times. Computer controllers allow setting it and forget about it until the kiln cools and is ready to unload and one button for many other preprogrammed firings. I’m not sure exactly when but mid fire became popular due to lower energy cost firing and because it is much easier to fire that heat range. High fire is cone 9/12 but cone 9/10 being the most frequently used high fire range 2300-2400f roughly but cone firing is more about work heat than temperature. Mid fire usually is cone 5/6 2000-2200 roughly depending on the firing schedule, more time longer firing more work heat lower actual temperature. You can tell mid fire from high fire by the sound made tapping the rim, high fire has a high pitched ring due to the clay body being vitrified mid fire has a duller sound because the clay is not usually completely vitrified.[/QUOTE]
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