| SinoSi's borosilicate optical windows are ideal for high temperature, harsh environment applications. Unlike common borosilicate that is drawn flat, BOROFLOAT? material is produced by a float technique that yields superior surface accuracy¡ªtypically 4-6 waves per inch. The resulting minimal wavefront distortion, combined with wide spectral transmission characteristics, make BOROFLOAT? an excellent choice for optical windows. In addition, this material exhibits excellent thermal properties and chemical resistance. BOROFLOAT? is about three times more resistant to thermal shock than standard soda lime glass. It has the thermal expansion properties of Tempax? or Pyrex? without the straw yellow color. Chemical resistance includes water, saline solutions, neutral and acidic solutions, chlorine, bromine, iodine, and organic substances. The main characteristics are as follow:
? Low Coefficient of Expansion
? Visible to Near Infrared Transmission
? High Resistance to Thermal Shock
? Borosilicate is Chemically Resistant
Specifications
Essential Parameter |
n d |
1.472 |
v d |
65.65 |
Spectral Transmission |
~90% from 0.35¦Ìm to 2¦Ìm |
Surface Accuracy |
4 - 6 waves/inch |
Diameter Tolerance |
¡À0.5mm |
Thickness Tolerance |
¡À0.2mm |
Linear Thermal Coefficient of Expansion (20¡ã to 300¡ãC) |
3.25 x 10 -6 /¡ãK |
Transformation Temperature |
530¡ãC |
Maximum Operating Temperature |
Short Term |
500¡ãC |
Long Term |
450¡ãC |
Thermal Conductivity |
1.12 W/(m x K) |
Mean Specific Thermal Capacity (20/100¡ãC) |
0.83 kJ |
Resistance to Temperature Differences |
Short Term |
|
1 hour |
110¡ãK |
1 - 100 hours |
90¡ãK |
Long Term |
>100 hours |
80¡ãK |
Resistance to Thermal Shock |
Up to 4mm thick |
175¡ãK |
4 - 6mm thick |
160¡ãK |
6 -15mm thick |
150¡ãK |
Modulus of Elasticity |
63 kN/mm 2 |
Density |
2.2g/cm 3 |
Poisson's Ratio |
0.2 |
Stress-Optical Coefficient |
4 x 10 -6 mm 2 /N |
Our Windows Re-Order No.
Re-Order No. |
Diameter (mm) |
Thickness (mm) |
SS/WB1 |
12.7 |
1 |
SS/WB2 |
25.4 |
1 |
SS/WB3 |
50.4 |
2 |
SS/WB4 |
76.2 |
3 |
SS/WB5 |
100 |
3 |
SS/WB6 |
120 |
3 |
SS/WB7 |
150 |
3 |
Note :
Size range: diameter 10 to 200 mm, thickness is from 0.2 mm to 20 mm. |
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