Borofloat 33

Borofloat Glass is manufactured by Schott, andis a highly chemically resistant
borosilicate glass with lowthermal expansion that is produced using the float
method.Other key properties of Borofloat are itsmirror like surface quality, high
thermal resistance, and excellent transmission.

Borofloat glass is often used as an less expensive equivalent to Pyrex for many
applications. The materials differ in their chemical composition in the alkali ratio of Na2O to K2O and in their content of oxidic minor components which affects the tran smission of the material. Consisting of natural raw materials, Borofloat is harmless to both humans and to the environment, and is also recyclable.

Thermal Properties:

Thermal Coefficient of Expansion (20-300°C): 3.25 x 10-6 K-1
Specific Thermal Capacity (20-100°C): 0.83 KJ x (kg x K)-1
Specific Thermal Conductivity (90°C): 1.2W x (m x K)-1
Transformation Temperature Tg: 530°C/986°F
Annealing Point: 560°C/1040°F
Softening Point: 815°C/1508°F
Thermal Conductivity: 1.2 W/mK @90°C
Maximum Operating Temperature Considering RTG (Resistance to Thermal Gradients)
and RTS (Resistance to Thermal Shock):
Short Term: 500°C/932°F
Long Term: 450°C/842°F

Mechanical Properties:

Density (25°C/77°F): 2.23 g/cm3
Modulus of Elasticity: 63 kN/mm2
Young's Modulus (25°C/77°F): 64kN/mm2
Knoop Hardness HK 0.1/20: 480
Poisson's Ratio: 0.2
Bending Strength: 25 MPa

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