Top coat
Top coats make lenses easy to clean, smooth, hydrophobic and oleophobic, repelling dirt and water. Satisloh offers different materials (chemicals & recipes) that can be applied either directly inside the AR vacuum chamber or in a separate vacuum chamber.
Hydrophobic, Super Hydrophobic & Oleophobic
Easy cleaning is one of the most important features of AR coated lenses. Without a top coat, the lens is rough, attracts dirt and water and is tougher to clean. There are a number of top coat options to choose from and theses are applied on top of the AR coating inside a vacuum chamber.
The quality of a hydrophobic top coating is measured by the contact angle of a water drop on a lens. A higher contact angle (roundness of the water drop) indicates better hydrophobicity.
The newest generation of top coatings has water contact angles over 110°, and also repels oil for example from human skin (fingerprints). This property is referred to as oleophobicity and is measured by the Dynamic Oil Contact Angle.
Hydrophobic
Typical: 97° - 104° water contact angle.
Satisloh Top Coat Material: Cleanvac.
A higher contact angle (roundness of the water drop) indicates better hydrophobicity.
Super Hydrophobic
Typical: over 106° water contact angle.
Satisloh Top coat material: Aulon.
A higher contact angle (roundness of the water drop) indicates better hydrophobicity.
Super Hydrophobic & Oleophobic
Typical: over 110° water contact angle & dynamic oil contact angle.
Satisloh Top coat material: Satin.
Grip* phased hydrophobic: A sacrificial overcoat applied on top of Satin solves the slippage problem when edging super-hydrophobic lenses. Grip can be wiped off after edging. *not available in all countries.
A higher contact angle (roundness of the water drop) indicates better hydrophobicity.
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