GENERAL INFORMATION Substance L5 Patinal® is a low refractive index mixture of silicon dioxide and aluminium oxide. It was developed to provide an evaporation material for the deposition of low index thin films particularly well suited for plastic substrates. The material enables very durable and highly transparent coatings on cold substrates made of plastics. To obtain higher density films, Substance L5 Patinal® can also be deposited using Ion Assisted Deposition (IAD). Coatings made with Substance L5 Patinal® show an increased density and improved stability against damp heat. Substance L5 HD Patinal® granules feature a higher density compared to standard Substance L5 granules, permitting a larger quantity of material in the crucible per filling. Substance L5 HD tablets show a density of approx. 2.2 g/cm³, which is close to the bulk density of fused silica.