China Factory Price Telescope Mirror Blanks Borosilicate Glass

Factory Price Telescope Mirror Blanks Borosilicate Glass

Product Description
High Borosilicate glass 
Borosilicate Glass is one of transparent colourless glass, through wavelength is between 300 nm to 2500 nm, transmissivity is more than 90%. Coefficient of thermal expansion is 3.3. It can acidproof and alkalifast ,the high temperature resistant is about 400°C. If course handling , the high temperature resistant can reach 550°C or so. Apply to lighting fixture , chemical industry , electron, high temperature equipment and so onBorosilicate Glass Sheet Technique Index Sign:
1.Surface quantity:0/0,40/20 80/50
2.Surface accuracy:1/10 into,1/4 into2 into
3.Thickness business trip:±0.02mm
4.Center deviation:5Arc second1Arc Minute
5.Process the scope:The thickness is the most thin to attain 0.5mm
6.Coated
7.Tempered 

Densityρ:
2.23± 0.02g/cm3
Hardness:
>7
Tensile strength:
4.8×107Pa(N/M2)
Bulk modulus:
93×103 M pa
Modulus of rigidity:
3.1×1010Pa
Young's modulus:
63KN/mm3
Compressive strength:
1200kg/ cm2
Poisson's ratio:
0.18
Thermal expansion coefficient:
(0-300℃) (3.3±0.1)x10-6K-1
Coefficient of thermal conductivity:
1.2W×(m×k) -1
Specific heat capacity:
(20-100℃) 00.82kJx(kgxk)
Optical performance:
 
1. Light transmittance:
                         92%
2. The refractive index:
Nd: 1.47384 
3. The wavelength:
435.8nm=1.481,   479.9nm=1.4772  , 546.1nm=1.4732
Softening point:
810±10 ℃
The resistivity1gρ
250℃  8.0Ω×cm
Dielectric coefficientε
4.7
Dielectric strength
5 ×107V/M
Dielectric loss factor
tanσ(MC20℃)≤38 ×10-4
Resistance to cold and hot shock
         280℃ 
Continuous working temperature
≤550℃
Water resistance:
ISO719           HGB  Level 1
Acid resistance
ISO195           HGB  Level 1
Alkali resistance
ISO695           HGB  Level 2
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