steel doors with thermal break

LG37S Hot-rolled steel series

Produced with hot-rolling technology, the 37 Series delivers a bold and solid profile with exceptional structural stability. Its clean, powerful lines make it ideal for expansive floor-to-ceiling windows, public architecture, and industrial-style projects, creating a strong visual presence and architectural impact.

LG50S Cold-bent steel series

Formed through advanced cold-bending techniques, the 50 Series is distinguished by its slim and refined profile, combining strength with lightness. It is best suited for interior partitions, fine window divisions, and minimalist modern spaces, offering both stability and a sense of elegance.

LG65S Thermal-break steel series

With integrated thermal-break technology, the 65 Series combines the inherent strength of steel with superior insulation and soundproofing performance. It is particularly suited for villas, luxury residences, and high-performance commercial spaces, ensuring both comfort and long-term durability.

steel-look thermal-break aluminum alloy

Built on lightweight aluminum alloy with thermal-break design, the 65 Steel-look Series replicates the authentic appearance of steel while offering aluminum’s advantages of corrosion resistance, insulation, and reduced weight. Perfect for modern homes, apartments, and design-focused spaces, it balances performance with distinctive aesthetics.

Shanghai

Shanghai

Beijing

Shanghai

Shanghai

Shanghai

London

London

Australia

Qingdao

London

America

Engineered to Eliminate Thermal Bridging
Steel doors with thermal break are designed to interrupt heat transfer between interior and exterior environments, leveraging a polyamide or rigid polyurethane foam barrier embedded within the door frame and sash. This technology prevents metal components from directly contacting each other, reducing thermal conductivity by up to 80% compared to non-thermal break steel doors. By blocking heat escape in winter and heat ingress in summer, these doors maintain consistent indoor temperatures while slashing energy consumption. Applications span commercial buildings, industrial facilities, and high-security sites where energy efficiency and structural integrity are non-negotiable .

Core Technology & Material Specifications

• Thermal Break Composition:

• Polyamide Inserts: 18–20mm thick rods isolating inner/outer steel layers, blocking condensation and heat flow (U-values ≤0.32 W/m²K) .

• Insulated Cores: Polyurethane foam or rock wool filling (R-value up to 17.1) combined with double/triple-glazed argon-filled glass for enhanced thermal and acoustic insulation 

• Structural Design:

• 0.6–1.5mm galvanized steel facings with powder-coated finishes (50+ colors) resist corrosion and physical impacts .

• Reinforced frames (16–18 gauge) with multi-point locking systems (ASTM F3038 compliant) deter forced entry .

Certifications & Performance Metrics

• Energy Efficiency:

• Exceed Energy Star® standards with U-values as low as 1.0 W/m²K (versus 1.2+ in non-thermal break models), reducing annual heating/cooling costs by 10–15% .

• Safety Compliance:

• Fire Ratings: UL 10C-certified for 60–180 minutes of fire containment; compatible with intumescent seals that expand during fires to block smoke .

• Ballistic Resistance: Optional UL 752 Level 1–8 protection against handgun to rifle rounds .

Key Advantages Over Conventional Steel Doors

• Condensation Prevention: Thermal breaks eliminate "cold bridging," reducing internal condensation by 90% in humid or subzero environments.

• Lifetime Economy: Powder-coated finishes require no repainting; stainless steel hinges need only biannual lubrication, cutting maintenance costs by 60% over wooden doors. 

• Acoustic Control: STC 40–50 ratings reduce noise penetration by 30–40 dB—critical for hospitals, labs, and urban buildings.

Industry-Specific Applications

• Commercial Buildings: Full-vision glass thermal break doors enhance natural lighting while meeting ADA accessibility standards for offices and retail spaces. 

• Industrial Facilities: 2.5mm-thick steel facings with impact-resistant cores for factories exposed to heavy machinery or extreme weather.

• High-Security Sites: Armored thermal break doors (e.g., Tekno 3TT) with electromagnetic locks and bullet-resistant glazing for embassies or data centers .

Customization & Global Compliance

• Design Flexibility:

• Sizes from 820×2040mm to 2500×7000mm; reversible swing or sliding configurations .

• Glazing options: tempered, laminated, or Low-E glass with argon fill for optimal insulation .

• Certifications:

• CE (EU), Energy Star® (US), GB 12955-2008 (China), and ISO 9001 for quality management.

Installation & Maintenance Protocols

• Critical Installation Guidelines:

• Frame alignment within ±1.5mm tolerance to ensure thermal seals activate correctly; post-installation smoke tests mandatory for fire-rated models .

• Maintenance Checklist:

• Quarterly hinge lubrication with silicone spray .

• Annual EPDM weather seal replacement to maintain insulation integrity .

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• Immediate repair of surface scratches using zinc-rich primers to prevent corrosion .