Glass Lens Advantages

Optical, Chemical and Mechanical Properties of SWAREFLEX Precision Products


Swarovski special glasses are highly transparent in the visible (VIS) and near infrared (NIR) wavelength ranges as well as within the ultra violet range. This is achieved through the use of raw materials of high purityand by a special manufacturing process - designing the optical parameters of the used crystal glass for the optical masterpieces. By adding certain oxides, the refractive effect (refractive index and dispersion) of the glasses is adjusted in the line their application. For high-quantity illumination optics applications, it is currently possible to make use of glasses with refractive indices in the region of nd = 1.5 - 1.7. By using pure raw materials and a controlled production process, illumination optics elements can be produced that are free from inhomogeneities such as streaks or bubbles and in line with international ROHS regulations.

The Swarovski special glasses that are specifically developed for the use of illumination optics outdoors feature high UV stability. According to the IEC 62108 standard test, the actual UV radiant exposure in Arizona over 2 years was simulated using a UV-A radiant exposure of 50kWh/m2. No measurable reduction of transmission in the region of 300 to 1800 nm was detected.

The coloring of the glass can be modified as necessary by adding specific oxides. A precise and over the years constant seting reproduction of the color value of the optical masterpieces is possible. This means, for example, that LED lenses for special purposes requiring precise chromaticity coordinates can be set (e.g. LEDs used in traffic safety technology).


According to test results, Swarovski special glasses feature outstanding levels of resistance against acids, bases, phosphates and climatic influences[1].

Resistance against acidic solutions acc. to ISO 8424:1987
Resistance against alkaline solutions acc. to ISO10629:1996
Resistance against alkaline phosphate acc. to ISO 9689:1990
Climatic resistance acc. to ISO WD 13384


Due to their high strength, the special glass lenses are highly resistant against mechanical stress at exposure. As the glass transmission temperature (Tg) typically range from 400 - 500 °C, the thermal resistance of the glasses is outstanding. This means that the optical masterpieces are well-suited to secondary optics for high-brightness LEDs as well as lighting applications in high-temperature manufacturing environments, in deserts or other outdoor applications.



The appearance of glass elements and their optical function can be modified using a number of different coatings. These include, for example, anti-reflective coatings to increase light transmission (as mono or multi layers), reflective coatings, and silvering for beam deflections. Furthermore, various color effects can be achieved using special-effect coatings.

The surface can be mat finished using targeted chemical and mechanical abrasion (specific generation of scattered light, anti-dazzling).