Glass greenhouse construction adopts differentiated glazing designs for different structural areas. Side walls generally use standard
insulated float glass for basic thermal insulation and cost efficiency. For greenhouse rooftops that require superior safety and optical performance, ordinary glass is completely eliminated due to insufficient load-bearing capacity and poor light performance.
Currently
,ultra-clear tempered glass and
ultra-clear diffuse scattering glass are the two mainstream rooftop materials for modern commercial greenhouses. Many growers struggle to choose between the two, as their performance gaps directly affect greenhouse microclimate, crop growth, and final yields. Supported by professional horticultural research from Wageningen University & Research (WUR), this article analyzes their core differences and practical application advantages.
The most fundamental difference lies in light transmittance. Standard ultra-white tempered glass delivers a stable transmittance of 90%, while professional agricultural ultra-white embossed scattering glass reaches 91.5%. This 1.5% gap originates from distinct design priorities. As a conventional building material, ultra-white tempered glass takes structural safety as the primary standard, sacrificing partial optical performance. In contrast, diffuse scattering glass is professionally customized for agricultural planting, with light transmittance and uniform light distribution as core production indicators to adapt to crop photosynthetic needs.
Diffuse scattering glass features unique astigmatism advantages that tempered glass cannot match. It converts concentrated, harsh direct sunlight into soft scattered light, turning a single beam of light into wide-area uniform illumination. This effectively eliminates shadow dead zones caused by greenhouse frames and wall structures, ensuring every corner of the greenhouse receives even light. With balanced illumination, crops grow uniformly without uneven fruit size or inconsistent growth caused by local light deficiency.
WUR’s greenhouse planting experiments verify that soft scattered light can reduce crop leaf surface temperature by about 5°C in hot summer, effectively preventing leaf sunburn and browning. This greatly relieves high-temperature stress on crops and lowers greenhouse summer cooling costs. Beyond light softening, the 1.5% transmittance improvement brings tangible economic returns: industry practical data shows this subtle optical advantage can boost overall crop yield by approximately 5%, a core benefit for commercial greenhouses pursuing high productivity.
In addition, diffuse scattering glass has excellent hydrophobic self-cleaning properties. Rooftop glass is exposed to long-term wind, sun, and dust accumulation, which seriously weakens light transmittance. Its professional hydrophobic coating repels dust and rain stains, reducing daily maintenance work. Growers only need 5–15 regular cleaning sessions annually, greatly saving labor and maintenance costs compared to ordinary tempered glass with no self-cleaning function.
Another exclusive feature of diffuse glass is adjustable haze specifications, covering
0, 10, 20, 30, 40,50, 70, and75 grades, while tempered glass maintains a fixed 0 haze value. Growers can select matched haze levels based on local lighting conditions: low haze for low-light areas to maximize transmittance, and high haze for strong sunlight areas to avoid light damage. This customized adjustment keeps crops in the optimal photosynthetic state throughout the growing cycle.
To sum up, the two materials share the same foundation: both are tempered and made of ultra-white glass substrates with high safety. Their key differences cover five core dimensions: transmittance, light scattering performance, light characteristic conversion, hydrophobicity, and haze adjustability. With comprehensive advantages in light utilization, crop protection, and cost savings, ultra-white embossed scattering glass has become the preferred rooftop glazing for modern high-yield greenhouses.
