The Customized Deep Processing Borosilicate Glass Sheet N-Bk7 Optical Glass Plate is supplied as a precision glass plate / sheet made from N-Bk7 Optical Glass. Temperature 557celsuis Degrees. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
7.1*10-6/K (-30 Celsuis Degree to +70celsuis Degr)
Annealing Point
719celsuis Degrees
Transformation Temperature Tg
557celsuis Degrees
Abrasion AA
Ve = 63,96 Vd = 64,17
Thermal Properties
Item
Coefficient of Expansion
7,1 x10
Softening Point (107,6 dPa)
719 °C
Annealing Point (1013 dPa)
557 °C
Thermal conductivity
1,114 W/(m x K)
Specific heat capacity
0,858 J/(g x K)(20 °C ; 100°C)
Mechanical Properties
I
Main Applying Fields
A
pplying Fields
Typical Applications
Consistent Quality
Each batch undergoes rigorous optical testing (e.g., homogeneity checks, transmission measurement) to guarantee compliance with international optical glass standards.
Supplier
Shanghai Rui Tai Photoelectric Technology Co., Ltd.
Technical data
Item
Value
Coefficient of Expansion:
7,1 x10-6/K (-30 °C to +70 °C)
8,3 x10-6/K (+20 °C to +300 °C)
Viscosities:
Softening Point (107,6 dPa):
719 °C
Annealing Point (1013 dPa):
557 °C
Transformation temperature Tg:
557 °C
Thermal conductivity:
1,114 W/(m x K)
Specific heat capacity:
0,858 J/(g x K)(20 °C ; 100°C)
Item
Unit
Value
Density
g/cm3
2.51
Yong's Module E
GPa
82 x 103 N/mm2
Poisson's ratio μ
0,206
Compression strength
GPa
–
Bending strength
MPa
–
Tensile strength
MPa
–
Torsional rigidity
GPa
–
Vickers hardness
GPa
—
Knoop Hardness HK 0,1/20 (ISO9385)
–
610
Abrasion Aa*
–
ve = 63,96vd = 64,17
Refractive index nd
–
–
Softening point
ºC
–
Annealing point
ºC
–
Strain point
ºC
–
Specific heat(26ºC)
kJ/kgK
–
Thermal conductivity ratio(26ºC)
cal/cm.sec.ºC
–
Thermal conductivity ratio(100ºC)
Cal/cm.sec.ºC
–
Refractive Index name
Wavelength (nm)
Refractive Index
ni
365,0
1.53627
nh
404,7
1,53024
ng
435,8
1,52668
nF'
480,0
1,52283
nF
486,1
1,52238
ne
546,1
1,51872
nd
587,6
1,51680
nD
589,3
1,51673
n632,8
632,8
1,51509
nC
643,8
1,51472
nc
656,3
1,51432
nr
706,5
1,51289
ns
852,1
1,50980
nt
1014,0
1,50731
What to specify when you request a quote
Material — listed as “N-Bk7 Optical Glass”; name the glass or quartz grade.
Outline and thickness — give outline, thickness and tolerances.
Holes, slots and features — dimension every hole and its position tolerance on the drawing.
Edges — state edge finish and chamfer.
Surface — state polish and flatness where they matter.
What is the Customized Deep Processing Borosilicate Glass Sheet N-Bk7 Optical Glass Plate made of? expand_more
It is listed as N-Bk7 Optical Glass. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.
What should I include in a quote request? expand_more
Include material, outline and thickness, holes, slots and features, edges and surface, plus quantity and a drawing if the part is custom.
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Linear rows or circular/array patterns with configurable hole count, diameter and pitch, plus edge finish. Complex layouts can follow a supplied drawing.
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