Quality

At Cirkel, quality is a broadly defined concept. It begins with the selection of raw materials. We are just a bit proud to be able to say that our products are manufactured exclusively using natural raw materials of the highest level of purity.

We would especially like to mention our deposits of quartz sand here in Haltern am See - unique in Europe due to their purity.

In addition to our high standard of quality for our products - from raw material to finished product - the quality, i.e. competence of our employees is a significant factor in our success. Education, training, and personal commitment form the basis for this.

At the company and on site with customers. Which is why we have dedicated a special section here to this topic.

Quality assurance

The automated production process in all plants is continuously subjected to strict internal quality control and regular external inspections. We are happy to let someone "look over our shoulders" and are proud to pass every inspection with flying colors.

In addition to the external monitoring of our internal quality control, we voluntarily subject our products to testing for quality and characteristics.

For our customers, this means an addition assurance of quality for the products we supply. In 2006, we were awarded the seal of quality by the 'Qualitätsgemeinschaft Mauerwerksprodukte' for this voluntary quality control. 

In regular QM sessions, all divisions of the company meet together to discuss defects and shortcomings and remedy them as soon as possible. This is an advantage of a mid-sized business with a flat hierarchy. To assure quality, we comply with the international requirements of DIN EN ISO 9001. 

Quality and Environmental Protection

The highest priority for environmental protection is treating our natural resources with care.

Sustainability as part of our quality philosophy

For us, quality means much more than dimensional accuracy and durability. It begins with responsibility for the environment and resources. We are therefore all the more pleased to have been awarded the Sand-Lime Brick Sustainability Seal of Quality (KS-NGS) four times: for our entire company and for our three sand-lime brick plants in Haltern am See, Wickede, and Neuenkirchen-Vörden.

Introduced by the German Sand-Lime Brick Industry Association in April 2025, this seal of quality makes the ecological quality of sand-lime brick products transparent according to uniform and scientifically sound criteria. Among other things, the global warming potential (GWP) and the consumption of non-renewable primary energy (PENRT) – two key indicators on the path to climate-neutral construction – are assessed. The basis is a standard-compliant life cycle assessment, prepared according to international standards and independently audited.

The fact that all our locations meet these requirements confirms our high quality standards – not only for the product itself, but also for its origin and manufacturing process. For architects, planners, and building owners, this means certified environmental standards, reliable product safety, and eligibility for funding for sustainable construction projects.

This award is both confirmation and incentive for us to consistently develop our quality strategy further – with a focus on the environment, efficiency, and sustainability.