Low Reflection coating for Glass Surfaces

ARX manages the behavior of light at glass surfaces, in some cases making 99% transmission possible, whilst still providing a surface that is durable enough to survive the rigors of continuous exposure to the elements.

Anti-Reflective Coatings for Thermal Solar Glass

ARX-330 is a one-component solution forming highly transparent and clear, thin coating over a glass substrate. Based on nanotechnology, the optimized composition of the organic-inorganic matrix provides anti-reflective properties with high hardness after a low-temperature heat curing process. ARX-330 material is tuned for applications especially requiring good scratch resistance.
With the low refractive index of ARX-330, the efficiency of thermal solar modules can be improved with peak transmission increasing up to 98% for double-side coating.

Main Applications

• Thermal Solar Collectors
• Concentrated Solar Power
• Glass Tubes and Sheets


• Increases transmission by up to 5% for double side coating covering the IR range
• Is a furnace curable coating on soda-lime, low-iron, or borosilicate glass
• Low curing temperature from 200°C to 450°C
• High scratch resistance and environmental durable, >5H hardness
• Increased easy to clean qualities ensures no drop off in performance of the module due to dirt

Optitune’s patented monophasic siloxane nanomaterials result in a matrix, where the pore distribution and pore size are controlled on a molecular level yielding a homogeneous coated structure.

How to Apply

Apply the solution by dip coating process. The ARX-330 is suitable for both tube and sheet shaped glass, including
various glass types. By altering the dipping speed, the coating transmission peak maximum can be adjusted easily to meet the customer needs. The low viscosity of the solution is adjusted to fulfill dip coating conditions of an industrial coating line. Materials can be also fine-tuned towards higher dipping speed. ARX-330 is also available in formulations designed for other coating processes. Before applying, filtering is recommended. Both IR and oven heating are suitable for curing, but to
optimize drying and tempering parameters, a test matrix of heat-treatment variables is recommended due to furnace differences.

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