Materials | Borosilicate | SCHOTT Borofloat® Glass

Glass Type: Borosilicate

Description

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 Properties			Mechanical Properties
Thermal Coefficient of Expansion	(0/300°C): 32.5 X 10 -7/°C	Density	2.23 g/cm3 (at 25 °C/77°F)
Annealing Point	560°C / 1040° F	Knoop Hardness	HK0.1/20:480
Softening Point	815°C / 1508°F	Young’s Modulus	N/A
Strain Point	N/A	Poisson’s Ratio	0.20

Thermal Properties

Mechanical Properties

Thermal Coefficient of Expansion

(0/300°C): 32.5 X 10 -7/°C

Density

2.23 g/cm3 (at 25 °C/77°F)

Annealing Point

560°C / 1040° F

Knoop Hardness

HK0.1/20:480

Softening Point

815°C / 1508°F

Young’s Modulus

N/A

Strain Point

N/A

Poisson’s Ratio

0.20

Chemical Properties			Electrical Properties
Hydrolytic Resistance	class 1	Dielectric Constant	E=4.6 @/MHz &25°C
Acid Resistance	class 1	Resistivity	8.0 X 250°C; 6.5 @ 350°C
Alkali Resistance	class 2	Dielectric Strength	16 KV/mm @50 Hz & 25°C

Chemical Properties

Electrical Properties

Hydrolytic Resistance

class 1

Dielectric Constant

E=4.6 @/MHz &25°C

Acid Resistance

class 1

Resistivity

8.0 X 250°C; 6.5 @ 350°C

Alkali Resistance

class 2

Dielectric Strength

16 KV/mm @50 Hz & 25°C

Optical Properties
Refractive Index	1.472

Optical Properties

Refractive Index

1.472