Project location：
Zhangjiajie，Hunan Province
Glass Configuration:
15mm+2.67SGP+15mm+2.67SGP+15mm
ultra white steel laminated glass
Maximum Glass Size:
3050mm * 4420mm
At Zhongbo Glass, we are driven by the belief that glass can do more than enclose space — it can defy gravity itself. Nowhere is this more vividly proven than at the Zhangjiajie Grand Canyon Glass Bridge, one of the most iconic and thrilling architectural wonders in the world. Spanning a breathtaking 430 meters across a 300-meter-deep canyon, this transparent bridge offers visitors the sensation of walking on air. We are immensely proud that the very glass beneath their feet was engineered and manufactured by Zhongbo Glass.
Our mandate was extreme: produce structural glass floor panels that must safely support hundreds of pedestrians at a time, withstand harsh mountain weather, and remain flawlessly transparent — with no room for error. We delivered ultra-clear, triple-ply SentryGlas® Plus (SGP) laminated glass panels of substantial thickness, each acting as a load-bearing structural element. The Zhangjiajie Glass Bridge is not just a tourist attraction; it is a life-safety-critical structure, and our glass performs at the highest level of reliability every single day.
For the bridge deck panels, we fabricated a glass make-up that prioritizes structural strength, post-breakage integrity, and crystal-clear views:
15mm Ultra-Clear Tempered + 2.67mm SentryGlas® Plus (SGP) + 15mm Ultra-Clear Tempered + 2.67mm SGP + 15mm Ultra-Clear Tempered — Fully Laminated
Every component was selected and processed for this extreme application:
Triple 15mm Ultra-Clear (Low-Iron) Tempered Plies: Three layers of 15mm thick, low-iron tempered glass provide the primary strength and stiffness. At full temper (surface compression exceeding 69 MPa), each ply alone is four to five times stronger than annealed glass. The ultra-clear composition ensures that the terrifyingly beautiful canyon below is visible in true, undistorted color — no greenish tint.
Dual 2.67mm SGP Interlayers: Two thick layers of SentryGlas® Plus ionoplast interlayer bond the three glass plies into one monolithic structural composite. SGP is essential here: its stiffness and incredible tear strength (five times that of PVB) mean that even if all three glass plies were to fracture — an extremely unlikely event — the laminate would remain rigid and securely in place, preventing any catastrophic failure or glass fall-out. The bridge remains safe for evacuation and repair.
Total Thickness Exceeds 50mm: With 45mm of glass and over 5mm of SGP, each panel is a dense, rigid structural slab that can bear heavy pedestrian loads and resist bending under the weight of multiple visitors.
The maximum glass panel size for the bridge deck was 3,050mm in width by 4,420mm in length — covering over 13.5 square meters per panel. While these dimensions are moderate compared to some of our super-jumbo facade panels, the application transforms the challenge entirely. These are not vertical windows; they are horizontally installed, pedestrian-loaded structural floor panels.
Each panel must support distributed and point loads from heavy foot traffic, resist impact from dropped objects, and perform under constant environmental exposure, including temperature swings, UV radiation, and moisture. The glass must also meet stringent safety codes for public attractions, with redundancy built into every layer. At Zhongbo Glass, we approached this project with the same rigorous engineering that defines all our structural glass work — and the stakes could not have been higher.
Tempering three 15mm glass plies to such a size requires exacting control to avoid bow, roller wave, and edge distortion. For floor glass, flatness is critical because any unevenness could create stress concentrations under load or cause optical distortion that disorients visitors. Our jumbo flat tempering furnace used precisely calibrated heating and quenching profiles for each 15mm ply, achieving uniform surface stress and superior flatness. All three plies were matched to ensure a perfect stack.
Laminating three 15mm plies with two 2.67mm SGP interlayers presents a formidable de-airing challenge. SGP is stiff and traps air easily, especially in a thick stack. We employed a meticulous process:
Class 1 cleanroom layup in a dust-free environment to eliminate any particle contamination that could become a weak point under load.
Multi-stage vacuum bag de-airing with extended cycles to extract every trace of air from between the heavy plies.
Custom autoclave cycle in our high-pressure autoclave, ensuring uniform bonding across the entire 13.5-square-meter panel. The resulting laminate is perfectly clear, bubble-free, and fully adhered edge-to-edge, behaving structurally as a single monolithic glass slab.
In a floor application, the glass edges are potential weak points. Our panels underwent precision CNC edge grinding and polishing to remove all micro-cracks and achieve a high-luster finish. The edges were then inspected under magnification before lamination. This attention to edge quality is vital for long-term load resistance and resistance to moisture ingress.
Transporting heavy, 50mm-thick glass panels to the remote Zhangjiajie Grand Canyon site presented unique logistical challenges. The mountainous roads required careful route planning. We engineered custom heavy-duty transport stillages with enhanced vibration dampening to protect the glass during the journey. Each panel was delivered with full protective packaging and arrived on site dimensionally accurate and defect-free, ready for installation into the bridge’s steel support framework.
The Zhangjiajie Grand Canyon Glass Bridge is a showcase of Zhongbo Glass’s leadership in structural and safety glazing. Here is why we were entrusted with this world-famous project:
Structural Glass Engineering Expertise: We are specialists in producing glass that bears weight — floors, bridges, stair treads, canopies, and fins. Our SGP laminates are engineered to meet and exceed the load-bearing and post-breakage safety requirements of the strictest international codes.
Ultra-Clear Transparency at Extreme Thickness: Even at over 50mm total thickness, our panels deliver the brilliant, neutral clarity that defines the glass bridge experience. Our rigorous low-iron glass sourcing ensures zero greenish tint and consistent aesthetics.
SGP Lamination Leadership: SentryGlas® Plus is our interlayer of choice for structural applications. Our dedicated SGP cleanrooms and autoclaves produce flawless laminates for the most demanding safety-critical projects.
Proven Public Safety Record: Supplying glass for a pedestrian bridge that welcomes millions of visitors is a profound responsibility. Our quality management system, certified to international standards, ensures every panel is traceable, tested, and documented.
Iconic Project Portfolio: The Zhangjiajie Glass Bridge joins our peerless collection of landmark projects, including the 13.5-meter Huawei R&D Center panels, 12-meter Banyan Tree structural fins, 11.4-meter curved Zeekr Center, and the ultra-thick 19mm laminates for Grand Hyatt Dalian. From towering facades to transparent floors, our track record of engineering the impossible is unmatched in the industry.
Every day, thousands of visitors step confidently onto the Zhangjiajie Grand Canyon Glass Bridge, trusting their safety to the transparent floor beneath their feet. At Zhongbo Glass, we are proud to have engineered that trust into every 3,050mm × 4,420mm ultra-clear triple-ply SGP laminated glass panel. This project proves that our glass is not just for looking through — it is for standing on, building on, and defying limits with. When safety and spectacle must coexist, Zhongbo Glass delivers.
Contact Zhongbo Glass today to explore how our structural glass solutions can support your next ambitious project — whether it’s a glass bridge, floor, stair, or overhead canopy. Our engineering team is ready to partner with you from design to installation.
