CHETRA Mechanical Seals for the Pharmaceutical Industry

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CHETRA Pharma Competence


In the pharmaceutical industry, as well as in the related area of diagnosis, medicine and cosmetics are produced in solid, liquid and paste-like form by industrial production methods.

For this, many aggregates such as agitators, mixers, dryers, reactors and fermentors are used, for which mechanical seals must fulfill special prerequisites: Among other things, they must be free of chemical and biological contamination, they must protect the vacuumpressurized aggregates from material foreign to the product and they must ensure that no material from the vessel under excess pressure will leak out. Factors such as the ability to clean (CIP) and sterilize (SIP) the installations without disassembly are very important.

CHETRA takes economic efficiency and observance of statutory conditions as well as the requirements of environmental protection into consideration beginning with the basic concept of a seal and the choice of suitable accessories.


The results are innovative and often custom-made solutions based on decades of experience in this area, with sound application technology advice for the optimum appropriate mechanical seal and the corresponding accessories.

The CHETRA supply program covers special custom-made products and high-grade standard seals. Notable features and benefits:

  • robust construction with extensive safety reserves.

  • protection of sensitive components.

  • solid seal rings and stationary seats in self-aligning arrangement.

  • stationary design, if applicable.

  • meeting CIP, SIP, GMP requirements.

  • design with no dead spots.

  • EHEDG design (in adherence with hygienic requirements).

  • special seal face geometry.

  • guided circulation flow for optimum heat dissipation.

  • optimization of material: employment of suitable materials – secondary seals and seal faces in compliance with FDA. Steel qualities 1.4435 / 1.4404 (316 L) or 1.4539 are used with surface finish Ra value: < 0.4 μm.