- Armstrong Insulation Products - manufactures elastomeric products to control condensation and heat in mechanical systems, plumbing, and process piping.
- Bredero-Shaw Group, The - provides coatings, including ant-corrosion, insulation, concrete weight, and specialized, to the oil and gas pipeline industry.
- E. J. Bartells Co. - wholesale distribution of industrial and commercial heating and cooling products. Manufacturer of insulation products, fiberglass duct systems, refractory cast shapes and more.
- Extol Fabricated Insulation Systems - fabricators of thermal insulation systems for pipe, fittings, valves and vessels.
- Howred Corp. - producing Goodtemp high temperature insulation for piping, vessels, and equipment in continuous and cyclic operation.
- Insul-Tech inc. - performs insulation work on high and low temperature mechanical systems.
- Isoclima - pre-insulated copper pipes and foamed polyethylene insulation for piping.
- Kerco Thermal Insulation - commercial and industrial contractors.
- Smock & Schonthaler Industrial Insulation - high temperature pipe and blanket insulation for industry and construction.
- Sprinkmann Sons Corporation of Illinois - specializing in commercial and industrial all-metal insulation systems in the Midwest.
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