Reduce consumption of energy and resources

Using less energy and lowering our consumption of resources will always be an important focus of what we do.
SCHOTT continues to lower its specific energy requirement of melted glass by making a host of improvements to process sequences and using pure oxygen for firing. This will result in a significant reduction in emissions of nitrogen oxides and CO2 that harm our environment.
DIN ISO 50001 compliance is a component of our environmental policy.

Drawing balance (e.g. for melting tanks in Mainz, Germany)

  • Melting tank waste gases are over 99.5 % dust-free
  • Nitrogen oxide emission levels have been lowered by about 75% since 1990
  • The specific energy requirement per ton of glass has been lowered by more than 25% since 1990
  • The consumption of fresh water for manufacturing has been lowered by over 80% since 1989
  • 98% of the technical glass that breaks during manufacturing is recycled
  • In order to reduce emission levels, the melting tanks are heated using natural gas/oxygen (oxy-fuel) or electrical power
By installing a new tank for glass tubing in Mainz, a so-called oxy-fuel tank, SCHOTT has adopted the most modern tank approach possible from a technological perspective. Oxy-fuel technology calls for natural gas to be burned using pure oxygen. This results in a highly efficient combustion process that requires roughly 30 percent less energy than comparable regenerative tanks. In addition, hardly any nitrogen oxides are produced, which means there is no longer a need for complex catalytic processing of the exhaust gases. This technology also allows for the construction design of the melting tank to be simplified rather considerably. This, in turn, means that significantly less stony material is needed if tank repairs are performed on a regular basis. Generally speaking, the use of oxy-fuel technology makes a significant contribution towards protecting the environment, as well as sustainable manufacturing.