SCHOTT AF 32® eco Glass

Glass Type: Borosilicate


SCHOTT AF 32® eco is an alkali-free, alumina-borosilicate, thin glass produced by SCHOTT using the down-draw method which enables production in a thickness range between 0.03 mm and 1.1 mm.

Its fire-polished surface results in a low roughness value. The coefficient of thermal expansion of AF 32® eco is equivalent to silicon; thus making it an ideal choice for optical packaging material in semiconductor applications. Due to its high transformation temperature, it can be used in high-temperature applications of up to approximately 600 °C.

AF 32® eco is available in wafer format and is manufactured with eco-friendly refining agents. SGP can cut, drill, lap, and polish this material to many sizes and surface finishes.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion(20°C;300°C): 3.2 x 10–6 K–1Density2.43 g/cm3
Annealing Point728 °C / 1342 °FKnoop Hardness HK 1.1/20580
Softening Point969 °C / 1776 °FYoung’s ModulusE=74.8 KN/mm²
Strain Point686 °C / 1267 °FPoisson's Ratio0.238 µ
Chemical PropertiesElectrical Properties
Hydrolytic Resistance DIN ISO 719HGB 1 (10 µg/g)Dielectric Constant εr at 1 MHz5.1
Acid Resistance DIN 12116S 4 (60 after 6 hours im mg/dm²)Resistivity ρD DC at ϑ = 350°C in Ω·cm1.1·10^10
Alkaline Resistance DIN ISO 695A 3 (210 after 3 hours in mg/dm²)Dielectric StrengthN/A
Optical Properties
Refractive Index1.5099