Research & Development

The Stoelzle Research & Development team has set its focus on further improving the quality of our glass and the production processes, as well as reducing the energy consumption and CO₂ footprint in all our manufacturing sites.

Our research has a strong focus on constantly improving the manufacturing of glass.

Research employee writing formulas on whiteboard

Glass melting lab

In our state-of-the-art in-house melting lab we develop and test new glass batch formulas, which help save raw materials and reduce best possible our impact on nature.

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Extract from our projects

Cullet from Stoelzle green glass production

Use of cullet to save energy and lower emissions

During a campaign in 2019 the addition of 20% PCR cullet (recycled consumer glass) in the flint glass furnace of our Austrian production site saved in 6% energy and 10% CO₂. Our goal is also to increase the use of industrial cullet (PIR glass) on all sites.

Industrial Soda as a secondary raw material fo rthe Steolzle glass batch

Use of secondary raw materials

In the Stoelzle Group between 2015 and 2019, the use of secondary raw materials increased from 5,000 t per year to ~ 9,000 t. Calumite®/Slag Sand as a waste material from steel production; Biomass Ash as a waste product from biomass plants; Process Soda as an Industrial by-product.

Calumite®/Slag Sand

Does not contain bound CO₂ and thus significantly reduces the ecological footprint as well as the amount of energy used for 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

Over 10,000 t are available per year as a waste product of biomass plants affiliated to the CAG Holding. Stoelzle investigates the use of this secondary raw material in the glass batch.

Testing of glass quality in Stoelzle in-house laboratory

New glass laboratory

In our very own Glass Laboratory, we can analyse the quality of glass and raw materials down to the smallest detail. In the Experimental Melting Laboratory we are testing and developing new efficient batch recipes.

Optimisation of production processes via digitisation

Process optimisation

The collection and analysis of process data enables us to cfine-tune the manufacturing processes. We constantly evaluate and implement new technologies in the field of inspection machines and process automation.

Flint pharma bottles with Typ II inner surface treatment

Type 2 pharmaceutical glass

Our approach is to re-think an old process. Our challenge is find an innovative solution for interior surface treatment. Our goal is to considerably reduce the use of chemicals and our ecological footprint.

Bottles decorated with phosphorescent colour which shine in the dark

NRG 4.0

“New Radiating Glass” is a unique type of phosphorescent glass decoration. The colours change in accordance with the surrounding light; there are day and night colour schemes.