About Us

Our History

Our company was founded by Sam Stryffeler in 1946 as the Durolet Manufacturing Company and changed to Red Seal Electric Company in 1952. The first product offerings were proprietary electrical insulation devices for the open wiring systems utilized in steel mills.

While still producing these products, Red Seal has evolved into a complete machine shop for fabricating composite materials.

Markets served include Food and Material Handling, Electro-Magnet Manufacturing and Repair, Rubber Molding, Power Generation and Transmission, Induction Heating, Water Treatment, and Glass Manufacturing - virtually any process that needs custom machined parts that provide thermal, electrical, or mechanical insulation.

Red Seal holds Certificate No. 02.168.2 ISO 9001:2015 Without Design for Contract Manufacturing and distribution of mineral, fiberglass, plastic, refractory, and ceramic insulation.

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Our Competitive edge

We’ve been a leader in the field for decades because of our unique combination of quality materials, strong supplier partnerships, precision equipment, and an amazing team.

  • Committed to serving our customers

  • Extensive experience and expertise

  • Comprehensive selection of in-stock inventory

  • Quick turnaround from quote to shipment

  • High-quality custom machined parts

  • On-time delivery

Trade Groups & Affiliations