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Quality improvement in production and reducing the CO ₂ footprint are priorities for our research and development projects. Here you can find a brief overview of our current projects.

Our research is strongly focused on the continuous improvement of glass production.

Knowledge is strength

Continuous improvement

We are not satisfied with the status quo, so we are pushing both basic and applied research to gain new knowledge in the field of glass manufacturing.

Extract from our projects

Use of cullet

During a campaign in 2019 the addition of 20% PCR cullet (recycled consumer glass) in the flint glass furnace of our Austrian production site proved to save 6% energy and 10% CO ₂ . Our goal is to increase as well the use of industrial cullet (PIR glass) on all sites.

Secondary raw material for our glass production

Use of secondary raw materials

Within the Stoelzle Glass Group we increased the use of secondary raw materials between 2015 and 2019 from 5,000 tons per year to ~9,000 tons calumite/slag from steel production; biomass ash; soda ash.

Calumite®/Slag

Does not contain fixed CO ₂ and thus significantly reduces the ecological footprint as well as the energy expenditure during melting. Blast furnace slag is available as a by-product of the steel industry. This homogeneous material has a positive effect on glass colour and quality.

Biomass ash

The proprietary CAG Holding GmbH biomass plants produce over 10,000 tons of biomass ash. Stoelzle participates in international research projects and investigates the use of this secondary raw material in its glass production.

Testing of glass quality in Stoelzle in-house laboratory

State-of-the-art glass laboratory

In the in-house glass laboratory, the quality of glass and raw materials can be precisely tested. We also use our laboratory as an experimental lab for research and development for the glass melt.

Two persons are discussing the production process in front of a screen

Process optimization

The collection and analysis of process data enables a more precise calibration of the manufacturing processes. We regularly evaluate and implement new technologies in the field of inspection machines and process automatization.

Picture of different product showing flint type 2 glass bottles

EcoSecur type 2 glass

In the past year we succeeded in developing an innovative, resource-efficient, safe and stable process for the production of type 2 glass. Our intention was to develop a new process for the inner treatment of soda-lime glass in order to overcome the main weaknesses of the currently existing processes in terms of stability, safety and from an ecological point of view. In addition, it was our aim to develop a process that is also suitable for smaller bottle sizes by enabling optimal dosage of the treatment. Learn more about our type 2 glass.

Flint glass decorated with NRG4 showing different colours

NRG 4.0

The “new radiating glass” is a new phosphorescent glass decoration technique. The colour changes according to the surrounding light. We offer day and night colour schemes.