HENAN ZG INDUSTRIAL PRODUCTS CO.,LTD
HENAN ZG INDUSTRIAL PRODUCTS CO.,LTD
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Borofloat wafer
We provides Borofloat glass wafer in diameter range from 1" to 12 " . Borofloat glass have many unique characteristics such as Low Thermal Expansion Coefficient which is suitable for anodic bonding to silicon application , Good thermal shock resistance , High resistance to acid / alkali , and High transmission . These special features makes Borofloat glass wafer as a top choice for many industry applications . Borofloat glass wafer can be fabricated in round or square shape , with a SEMI standard flat or Notch , one side polished or two sides polished , thickness range from 0.4 , 0.5 , 0.7 , 1.1 to 3 mm , ultrasonic cleaning and cleanroom compatible wafer cassette package are also available. In addition , we offer custom specifications designed to your unique needs including , dimension , SEMI. Standard flats , surface roughness , edge profile , thickness , flatness , surface quality , cleanliness package method . We have various glass substrates in stock and can machine to your specification with high precision surface finish . Contact us for further information .
| Chemical formula | SiO2 |
| Mechanical Properties | |
| Density | 2.23 g / cm3 |
| Poisson's ratio | 0.14 ~ 0.17 |
| Young's modulus | 62.75 Gpa |
| Knoop Hardness | 480 |
| Thermal Properties | |
| Short-term operating temperature | 500 °C |
| Long-term operating temperature | 450 °C |
| Thermal conductivity ( 90 °C ) | 1.2 W / (m. K) |
| Thermal expansion coefficient | 3.25 ×10 -6 K-1 |
| Electrical Properties | |
| Resistivity ( ohm-cm ) | 8@250 °C / 6.5@350 °C |
| Loss Tangent | 37 x 10-4 |
| Dielectric constant e | 4.6 |
| Optical Properties | |
| Refractive index ( @ 589 nm ) | Nd =1.472 |
| Viscosity Properties | |
| Working point | 1270 °C |
| Softening point | 820 °C |
| Annealing point | 560 °C |
| Strain point | 518 °C |
| Chemical Properties | |
| Acid resistance | class 1 |
| Alkali resistance | class 2 |
| Hydrolytic resistance | class 1 |
| Composition | |
| SiO2 | 81% |
| B2O3 | 13% |
| Na2O / K2O | 4% |
| Al2O3 | 2% |
| Diameter | Ø 1" / Ø 2" / Ø 3" / Ø 4"/ Ø 6" / Ø 8"/ Ø 12" |
|---|---|
| Square size | 10 x 10 / 20 x 20 / 50 x 50 / 100 x 100 / 200 x 200 mm |
| Thickness | 0.4 mm / 0.5 mm / 0.7 mm / 1.1 mm |
| Surface | one side polished / two sides polished |
| Flat | SEMI.Std. flat or Notch |
| TTV | <= 15 um |
| Roughness | Ra <=10 A |
| Surface quality | 60 / 40 |
| Package | Ampak cassette / jar |