Technical Details of AF 32® eco

The alkali-free AF 32® eco is both environmentally friendly and technically impressive, with high transmission levels and excellent dielectric properties. With tight geometric tolerances and a CTE similar to that of a silicon wafer, this unique glass has a wide array of advantages for a large number of industries.

Alkali-free with a low CTE

One of the eco-friendly characteristics of AF 32® eco is its alkali-free composition, making it highly suitable for semiconductor systems. With a similar CTE to a silicon wafer, it can be used as a high-quality wafer-thin glass cover or substrate for silicon chips in semiconductors and MEMS devices.

Wide thickness range, tight geometrical tolerance

AF 32® eco is available in a wide variety of thicknesses, from an extremely thin 30 µm up to 0.5 mm. Whatever thickness you require, the total thickness variation (TTV) factor remains tightly controlled, at just ≤ 5 µm to 15 µm.

Outstanding transmission levels

Light transmission achieved by AF 32® eco glass is consistently strong both in the visible range and at higher wavelengths up to near-infrared. It achieves an exceptional luminous transmittance level of 91.9 %, but after AR coating, transmission can reach 97-99 %.

Excellent dielectric properties

The low dielectric loss of AF 32® eco allows applications at very high frequencies. The thermal expansion (CTE) is matched to silicon and allows co-processing with silicon wafers. This allows for example to realize SAW and BAW filter in the GHz range with low insertion loss.