High Transmission Aluminum Silicate Glass/b270 Glass/Borofloat33 Glass

Product Overview

Description

Introduction:
A particularly low coefficient of thermal expansion is what makes BOROFLOAT glass remarkably resistant to high temperature levels. Our borosilicate glass is proven to stand up to high and fluctuating temperatures typical of applications such as high-performance lamps, cinema projectors and inspection panels for chemical reactors. Even with applications where rapid cooling down from higher temperatures is the requirement,

 

BOROFLOAT  glass easily passes the test. For example, the temperature difference between a hot panel center and a cold panel edge.

 

Outstanding thermal resistance

· Very good temperature stability

· Excellent resistance to thermal shock

· Can be thermally toughened

· Can be thermally shaped (3D)

l Glass technical parameters:

a)Material: BOROFLOAT® 33,TEMPAX®
b)Thickness:1.0mm,1.5mm ,2mm ,3mm 4mm 6mm 8mm 10mm -20mm (Tolerances+ / - 0.02 mm)
c)standard size:Φ4",Φ5",Φ6",85´85mm,105mm´105mm,150´150mm (other size can be customized)
d)MIL:60/40
e)Roughness (Ra) Less-1.5nm

f)TTV Less 0.01mm

g)Chamfer C0.05~0.2mm

Thermal properties
Coefficient of Linear Thermal Expansion (C.T.E.) α (20 - 300 °C)	3.25 x 10-6 K-1 *
Specific heat capacity cp (20 - 100 °C)	0.83 kJ/(kg·K)-1
Thermal conductivity λ (90 °C)	1.2 W/(m·K)-1
* According to ISO 7991.

 

Maximum operating temperatures
For short-term usage (< 10 h)	500 °C
For long-term usage (≥ 10 h)	450 °C

 

Viscosity of BOROFLOAT® 33
Working Point (104 dPas)	1270 °C
LITTLETON temperature / Softening Point (107,6dPas)	820 °C
Annealing Point (1013 dPas)	560 °C
Strain Point (1014,5 dPas)	518 °C
Transformation temperature (Tg)	525 °C