Taking glass-ceramic right to the edge

Glass windows in ovens allow homeowners to check on their dishes as they cook, admire them and keep the heat inside where it belongs. They also prefer ovens that are easy-to-clean. Many like self-cleaning ovens, so long as they are safe and reliable. And from a design stand point, consumers want the inside window to look as clean and stylish as the outside. Glass-ceramic offers the reliability and performance needed, taking the inside window design right to the edge.

Challenge

Designing ovens with larger viewing windows

Larger glass windows lead to a wider temperature gradient. In particular, the innermost layer of the window package must be made of a material that can withstand thermal stress under all conditions and over the long term.

Innovation

Performance Edge

Soda-lime glass is the standard material for inner oven doors. While it is cost efficient, it has limitations under high thermal stress with edge-to-edge glass. SCHOTT glass-ceramic, on the other hand, has no limitations. SCHOTT glass-ceramic is characterized by its high thermal resistance, superior thermal expansion and exceptional high temperature gradient. Setting a new standard for safety, reliability and performance in large inner oven windows.

Edge to edge

Enhance the Performance Edge

Take performance to the edge with high performance low-e coatings, applied to the inner middle pane, specifically designed for use in oven doors with pyrolytic or conventional ovens. SCHOTT Flat Glass coatings’ provide outstanding heat reflective inner door glasses. The low emissivity coatings further enhance performance by reducing heat loss in all temperature ranges, increasing overall energy efficiency and simplifies oven door constructions. Clean inner ovens are desired, and SCHOTT Cool Print, improves heat reflection during pyrolytic cleaning process, reducing the outside temperature of the oven door, shortens heat-up time and is attractive alternative to metallic tape. A complete SCHOTT solution for edge-to-edge inner oven doors, in combination with glass ceramic.

High-performance enhancing coatings are available for edge-to-edge glass-ceramic in oven glass assembly

Performance Edge

1. edge-to-edge glass ceramic

2. high-performance low-e coating

3. cool print/decoration w/low e-coating

Performance Edge

Design Edge

With SCHOTT glass-ceramic, ovens now can have inner beauty. Whether recessed into the wall or free-standing, whether gas or electric– since edge-to-edge glass-ceramic fits into any type of oven, the technology opens up numerous possibilities for product design and development.

The inner look can be elevated completely. Edge-to-edge glass-ceramic allows designers flexibility to realize larger windows with fairly low weight, matching the inside with the outside style. Making ovens an edgy high-end differentiator.

Design Edge - Small Window Design Edge - Large Window
Smaller viewing area Larger viewing area

Moreover, edge-to-edge glass-ceramic make daily use much easier. The material is very hard and resistant to impacts, breaks and scratches. Because of its smooth surface structure right to the edges, it is very easy to clean.

Functional Edge

Performance and design are great but it must also be functional. Edge-to-edge glass-ceramic design gives you that functional edge to prevent heat leakage.

With metal-to-metal design, heat passes through the glass via thermal radiation and any metal exposed to heat from inside the cavity, can transfer to the outside of the glass due to conduction, and the convection heat circulated from inside the oven cavity can escape through gaps in the oven assembly.

By sealing the metal-to-glass, conduction and convection heat loss stops because the glass is flat and does not conduct heat. In addition, a low-e coating applied to the soda lime in the middle pane, provides a heat barrier and stops radiation heat loss. These are functional solutions by SCHOTT that meet UL 2020 standards, making larger inner oven doors safer and more efficient.

Heat loss issues with sealing on metal

Conventional oven door design has 3 types of heat loss

  1. Radiation heat passing through the glass
  2. Convection heat escaping through gaps in the oven assembly as air circulates
  3. Conduction heat transferring through the metal when exposed to heat in the cavity

Heat loss issues with sealing on metal

Conventional oven door design has 3 types of heat loss

  1. Radiation heat passing through the glass
  2. Convection heat escaping through gaps in the oven assembly as air circulates
  3. Conduction heat transferring through the metal when exposed to heat in the cavity

Edge-to-edge glass-ceramic provides an opportunity to enhance performance and design

Solutions to heat leakage with edge-to-edge glass-ceramic:

  • Stop conduction and convection heat loss by sealing on the glass
    • Glass is flat
    • Glass doesn’t conduct heat
  • Stop radiation heat loss with low-e-coating

Edge-to-edge glass-ceramic provides an opportunity to enhance performance and design

Benefits include:

  • Making oven door safer and more efficient
  • Meets UL requirements
  • Simplifies door configuration

People

“SCHOTT helps elevate the look of inner ovens by finding a balance between performance, design and function from the use of glass-ceramic material and high-performance coatings. With edge-to-edge glass ceramic, appliance designers can now match the inner oven door style with high-end design of the outside. Making ovens a high-end differentiator.” Karen Elder, CERAN® Product Manager

Next

SCHOTT can give you the edge you need!

With the right material, cooking becomes truly safe. And it’s much nicer when the subsequent cleaning is done in no time at all. That way, time in the kitchen can be used and enjoyed for the important things.

Let SCHOTT help you take your inner oven door design straight to the edge.

What’s your next
milestone?

Contact

Kimberly Kennell
Marketing and Communication
SCHOTT North America, Inc.

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