Indianapolis, IN
Marian Chicago
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Brief History
In 1929, Mr. John J. Glenn founded J.J. Glenn Company in West Chicago, IL as a distributor of electrical components and supplies. Marian purchased J.J. Glenn in 1984. Since then, our Chicago facility has evolved from a distributor of the electrical supply industry to a fabricator of flexible component parts and one of the largest distributors of Silicone RTV’s. Marian Chicago maintains the flexibility of a small independent company, but also benefits from the support of other Marian divisions.
Expansion and Cleanroom Manufacturing
In 2013, Marian Chicago expanded its operations by acquiring an adjacent building and constructing a 40-foot enclosed corridor to connect the two facilities. This expansion more than doubled the site’s manufacturing footprint. Continued growth led to the acquisition of an additional 70,000 ft2 building next door in 2020, increasing the total space of Marian Chicago’s operation to 120,000 ft2 (approximately 11,000 m2).
As of 2025, Marian Chicago has converted 4,000 ft2 of production space into two separate ISO 7 (Class 10,000) certified cleanrooms. These controlled environments support the production of high-precision medical components and assemblies under strict contamination and quality control standards. The expanded cleanroom operation, as well a new ISO 13485 certification, further advance its investment in medical manufacturing.
Additional core manufacturing capabilities at Chicago include:
- Rotary die cutting
- Steel rule die cutting
- Matched metal die cutting
- and more
This combination of advanced capabilities and cleanroom manufacturing makes Marian Chicago a trusted partner for medical, electronics, automotive, and industrial OEMs seeking high-performance, custom die-cut solutions.
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