Borosilicate Glass with Counterbore Holes

Tempered round borosilicate glass disc with counterbore holes

Working temperatures up to max. 500°C, diameter 10-420mm; thickness 1-85mm

Can do different kind holes on glass such as anchor holes, counterbores, countersinks etc.

Additional information

Material

Borosilicate Glass

Size

Diameter 10-420mm, OD95xT10mm

Thickness

Normal 1-30mm, can up to 1-85mm

Edge

Grind or Polish

产品生产工艺

Product Details

Size and Dimentions

Diameter: 10-420mm.

Thickness: normal 1-30mm, can up to 1-85mm

 

Technique Specification for tempered borosilicate glass

Chemical Performance
1 SiO2 B2O3 Na2O Al2O3 Fe2O3
80.3% 13.04% 4.17% 2.44% 0.027%
2 Water resistance ISO0719 I
3 Acid resistance ISO0195 I
4 Alkali resistance ISO0695 II
Mechanical Performance
5 Density ρ 2.2250g/cm3 @24℃
6 Bending Strength 150N/mm2
7 Surface compressive stress 90N/mm2
8 Young’s modulus 64 GPa
9 Poisson’s ratio 0.2
10 Hardness 5.5 Mohs, (470 Knopp, 580 Vickers)
11 Elastic Modulus 67KNmm-2
Thermodynamic Performance
12 Thermal Expansion Coefficient (0-300℃)(20-300) ≤3.3*10-6K-1   
13 Softening Point 820±10℃
14 Strain Point 520±10℃
15 Annealing Point 560±10℃
16 Caloricity (20-100℃) 0.83KJ* (kgxK)-1
17 Thermal Coefficient 1.2WxmxK-1
18 Thermal Shock Resistance 180K
19 Max Working Temperature -70 up to 500℃   Short time (<10h)
20 Max Working Temperature -70 up to 280℃   Long time (>10h)
Eletric Property
21 Electric Volume Resistivity 8.6×1013Ωxcm (at 25℃)

1.4×106Ωxcm (at 300℃)

1.4×10 6Ωxcm (at 300℃)

22 Dielectric Dissipation Fraction 38×10-4 (at 1MHz, 20℃)
23 Dielectric Constant εr 4.6 (at 1MHz, 20℃)
Optical Property
24 Refractive Index 1.4714 @24℃

 

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