Sure, ultra-clear tempered glass can definitely achieve a thickness of 25 mm.
1. Technical feasibility
Raw sheet supply: The mainstream large-scale ultra-clear glass producers in China (such as Jincheng Group, Nanshan Glass, Xinyi, etc.) can all stably produce raw sheets of ultra-clear glass that are 25mm or even thicker. It is usually achieved by fusing multiple layers of glass (laminating or compounding) or directly producing thick plates.
Tempering capacity: Modern tempering furnaces (especially large ones with good convection heating) are fully capable of processing glass up to 25mm in thickness. For this thickness, a longer heating time and a gentler cooling (wind pressure) process are usually required to ensure the uniform distribution of tempering stress and prevent cracking or excessive deformation during the tempering process.
2. Main application fields
25mm thick ultra-clear tempered glass is a type of heavy-duty glass, mainly used in situations where safety, strength and visual effects are highly demanded.
Large-scale building curtain walls: especially in high-rise buildings or areas with high wind pressure, they are used as panels or guardrails.
Atrium guardrails and sightseeing elevators in high-end shopping malls and hotels: balancing transparency and safety.
Observation Windows in large aquariums and oceanariums: They need to withstand tremendous water pressure.
The oversized floor-to-ceiling Windows and door panels of luxury buildings.
Display cases in museums and galleries.
High-end furniture and decoration.
3. Performance characteristics
Extremely high safety: After tempering, it becomes safety glass. When broken, it breaks into small particles and is less likely to cause serious injuries.
Outstanding wind pressure resistance and impact resistance: Its thickness and tempering process enable it to withstand extremely large external forces.
Outstanding transparency: The low iron content of ultra-clear glass itself makes its self-explosion rate lower than that of ordinary float glass, with a purer appearance and extremely high light transmittance (usually above 91.5%), providing an excellent visual effect.
Heavy weight: The weight of 25mm glass is approximately 62.5 kilograms per square meter, which imposes extremely high requirements on the load-bearing capacity of the supporting structure (profiles, hardware, building structures) and the installation process.
4. Important Notes
It is not a single piece of glass that is directly tempered: Many of the 25mm ultra-white tempered glasses commonly seen on the market are composed of "multiple layers of glass". For example:
12mm ultra-white tempered + 1.52mm PVB/SGP film + 12mm ultra-white tempered, the final product thickness is approximately 25.5mm. This method (laminated glass) is safer. Even if it breaks, it will adhere to the film and will not fall off.
It could also be a combination of 10mm + 10mm + 5mm, etc., depending on the strength and functional requirements (if a hollow layer is needed, the structure will be more complex).
Customized production: This thickness is a non-standard customized product. Orders need to be placed with professional glass deep processing enterprises based on the specific design requirements of the project (size, shape, drilling, slotting, edge grinding process, etc.). The price is very high.
Self-explosion risk: Although ultra-clear glass has a relatively low self-explosion rate due to its low impurity content (which can be reduced to about one in ten thousand), tempered glass itself has the characteristic of self-explosion. In important occasions, it is recommended to use ultra-white homogeneous tempered glass to further eliminate the influence of nickel sulfide impurities and minimize risks.
Summary
25mm thick ultra-white tempered glass is technically feasible and a mature choice for high-end buildings and special applications. It usually appears in the form of laminated composite to ensure the highest safety performance. When making actual purchases, you need to provide detailed technical requirements to professional glass deep processing manufacturers. They will offer you the best glass configuration plan (such as single-pane tempered, laminated, insulating, and other combinations) based on your needs (safety standards, structural requirements, budget, etc.).
