Lenz - The Specialist for Ground Joints.

With decades of experience, advanced technological know-how and the outstanding properties of DURAN® glass we guarantee the proven quality of our precision ground joints.

The Lenz® range of ground joint instruments includes conical joints, stopcocks, ground joint flasks, separating and dropping funnels as well as a large range of ground joint components.

Quality with system:
Lenz® ground joint instruments are produced according to the standard DIN 12242 / ISO 383. Each production step is tested by a quality management system, based on DIN ISO 9001 / EN 29001. The tests are examined by a cone measuring device for checking the taper, a surface roughness meter for testing the roughness parameters and a wall thick­ness measuring apparatus with a magnetic inductive measuring process to guarantee a homogenuos concentricity and wall thickness.

A multiple-station unit serves for grinding as well as for pre- and post-polishing of our ground joints. An electro-mechanical scanner ensures constant quality. In cases of specific high demands on function and precision the grinding is processed by hand.

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