DLAR (Dual-layer anti-reflective) coating

Consistently high system performance even in extreme environmental conditions


Dual-Layer Anti-Reflective Glass Coating is used on Belinus modules (DLAR). According to our current manufacturing findings, the average standard test condition (STC) flash power boost owing to Anti Reflective Coating on glass is 3.7 percent.

The energy production gain from DLARC glass modules is 4.5-6 percent depending on the type of installation and location after more than three years of outdoor testing in varied conditions. The enhanced coating gain in diffuse and off-angled light due to the influence of the refractive index and light dispersion inside the coating accounts for the larger energy gain when compared to STC flash gain.


DLAR coating is a must-have in today's environment. The efficiency of solar systems or greenhouses rises in proportion to the amount of energy irradiated, and hence with increasing glass transmission. If the incidence angle of light is vertical to the glass, double-sided AR coating boosts solar glass transmission by roughly 5%, or by about 2.5 percent on each surface.


For the end-user, this is critical: when compared to collectors without AR coating, DLAR (Double-sided AR-coated) solar glass offers ideal low light performance and can greatly boost energy yield. At a low light intensity, the reflection loss at the air-to-glass interface increases dramatically at a low light incidence. This detrimental effect is significantly mitigated by our AR coating. Even with a 70° incidence angle, the AR-coated glass transmits around 85% of the light. Non-coated glass transmits only about 70% of the light. In the mornings and evenings, as well as in the spring and fall, this influence is most noticeable.

Belinus' anti-reflective, ultra-durable coating is highly tough and resistant to all forms of weather, ensuring excellent yield stability and investment security.

Diffusion-tight barrier layer


Belinus DLAR  – Purest quartz glass on solar glass

We make the industrial DLAR coating in the cleanest vacuum possible, on ribbons up to 21 m2 in length. The coating is exceptionally homogeneous and reproducible throughout the entire surface thanks to this one-of-a-kind procedure.


The DLAR coating is "annealed" at a temperature of roughly 650 °C during the subsequent thermal tempering of the ground glass, irreversibly chemically combining with the glass substrate. A nano-porous structure arises on the outer surface, which is undetectable to the naked eye and is responsible for the very effective anti-reflective coating.


The added effect: between the glass substrate and the nanoporous structure, a diffusion-tight SiOx barrier layer stays in situ. Solar glass made of the purest quartz! This barrier layer cannot be removed or pierced, ensuring our AR coating's distinctive and long-lasting resilience. Our consumers and independent research organizations both attest to the exceptional endurance of our products. In addition, the coating complies with the DIN EN 1096 and IEC 61215 standards.

Easy to process and extremely robust


Our DLAR coating is tough and simple to work with. Because the coated glass is durable, it can be used in desert-like environments. 

solar glass manufacturing.jpg