Faq

Solar glass is a specialized high-transparency cover glass engineered for photovoltaic modules, requiring exceptional light transmission (>91%) and long-term weatherability. Standard float glass is commodity flat glass used in general construction and fenestration. While both are produced via the float process, solar glass undergoes additional processing — including low-iron formulation and specialized coatings — to meet the demanding optical requirements of solar energy applications. MONTAG's solar glass product line is manufactured to these exacting standards.

Aluminum mirror (spelled aluminium mirror in British English) uses a vacuum-deposited aluminum reflective coating instead of silver. The advantages include lower cost, lighter weight, and adequate reflectivity for most decorative and functional applications. Silver mirror offers higher reflectivity and is preferred for precision optical applications. For furniture, decorative wall panels, and commercial interiors, aluminum mirror provides the optimal balance of performance and cost. MONTAG supplies premium corrosion-resistant aluminum mirror grades for hospitality and commercial projects.

Tempered glass (called toughened glass in UK/AU/NZ markets) is heat-treated to achieve approximately four times the strength of annealed glass, fracturing into small granular pieces upon impact. Laminated glass bonds two or more glass layers with a PVB interlayer, holding fragments in place if shattered. Tempered glass is typically used for doors, shower enclosures, and structural glazing; laminated glass is preferred for facades, skylights, and balustrades where post-breakage retention matters. Both serve distinct safety functions and are often specified together in building projects.

Cold repair (also called cold rebuild) is a major maintenance procedure where a glass furnace is cooled down completely for refractory replacement and structural overhaul. Unlike routine maintenance, cold repair requires months of downtime and significant capital investment. It is typically undertaken every 8–12 years per furnace. The current wave of cold repairs across Chinese float glass plants is a supply-side discipline measure — temporarily removing capacity from the market, which contributes to price stabilization as observed in July 2026.