About Cardinal Glass Industries
Cardinal Glass Industries is one of the largest privately held glass manufacturers in the United States, specializing in the fabrication of insulating glass units (IGU), tempered glass, and proprietary low-emissivity coatings. Founded in 1962 in Eden Prairie, Minnesota by Gene Christian, the company has expanded to operate multiple fabrication facilities across the country while remaining under private family ownership — a significant counterpoint to the publicly traded glass conglomerates that dominate the industry.
Cardinal's most recognized technical contribution is its LoĒ (low-emissivity) coating series, which spans a range of residential and commercial glass performance specifications. The LoĒ-i89, LoĒ²-272, and LoĒ³-366 products address specific U-factor and solar heat gain coefficient targets and are widely adopted by residential and commercial window manufacturers who source Cardinal IG units as glazing components. Cardinal also develops warm-edge spacer technology and operates glass tempering capacity for safety glass applications — services that complement its IG fabrication focus.
Unlike manufacturers that sell finished fenestration products directly to end users, Cardinal primarily sells fabricated glass components to window and door manufacturers, glazing contractors, and distributors. This means Cardinal's products live inside windows and doors made by other brands, making its market influence broad but not always visible at the point of specification. Specifiers who want to ensure a specific low-e coating technology should ask the window or door manufacturer which IG fabricator and coating series are incorporated in their product.
Company Snapshot
Product Lines
LoĒ Low-Emissivity Coatings
Proprietary pyrolytic and sputtered low-e glass coatings across a performance spectrum for residential and commercial applications.
- LoĒ-i89: interior-surface coating for cold climates emphasizing U-factor
- LoĒ²-272: balanced solar control and insulation for mixed climates
- LoĒ³-366: triple-silver coating for maximum solar control and low U-factor
- Compatible with argon and krypton gas fill
Insulating Glass Units
Factory-fabricated IG units in dual and triple pane configurations incorporating Cardinal glass, coatings, spacers, and gas fill.
- Dual and triple pane configurations
- Warm-edge spacer technology
- Argon and krypton gas fill options
- Tempered and laminated glass lites available
Tempered Glass
Safety-tempered glass lites for residential and commercial applications where code or design requires safety glazing.
- ANSI Z97.1 and CPSC 16 CFR 1201 compliant
- Available in Cardinal coated and clear glass
- Coordinated with IG unit production
Common Applications
Window and Door Manufacturers
The primary Cardinal customer — residential and commercial window and door manufacturers who purchase IG units as glazing components for their finished products.
Commercial Glazing Fabricators
Commercial glazing fabricators who source coated glass lites and IG units for curtain wall, storefront, and custom glazing applications.
What To Know
Private ownership and R&D investment
As a private company, Cardinal reinvests in coating and spacer technology without public market quarterly pressure — the LoĒ coating series reflects decades of sustained product development.
LoĒ coating breadth
Cardinal's coating line covers more performance tiers than most single-manufacturer alternatives, allowing window makers to source across product lines from a trusted glass supplier.
Specification influence is upstream
Cardinal's products are inside other manufacturers' windows — confirming coating series with the window manufacturer is the specifier's leverage point.
Editorial profile based on Cardinal Glass Industries public product and company materials; last reviewed May 2026.