SCHOTT Borofloat® Glass

Glass Type: Borosilicate


SCHOTT Borofloat® glass is a highly chemical resistant borosilicate glass with low thermal expansion that is produced using a float process. Other key properties of Borofloat® glass include an average 80/50 scratch/dig surface quality, high thermal resistance and excellent transmission. Borofloat® can be used as a substitute for Corning® Pyrex® in most cases. The materials differ slightly in chemical composition. SGP can CNC mill, drill, cut, lap, and polish Borofloat® to any dimension, shape or surface finish.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion(0/300°C): 32.5 X 10 -7/°CDensity2.23 g/cm3 (at 25 °C/77°F)
Annealing Point560°C / 1040° FKnoop HardnessHK0.1/20:480
Softening Point815°C / 1508°FYoung’s ModulusN/A
Strain PointN/APoisson’s Ratio0.20
Chemical PropertiesElectrical Properties
Hydrolytic Resistanceclass 1Dielectric ConstantE=4.6 @/MHz &25°C
Acid Resistanceclass 1Resistivity8.0 X 250°C; 6.5 @ 350°C
Alkali Resistanceclass 2Dielectric Strength16 KV/mm @50 Hz & 25°C
Optical Properties
Refractive Index1.472