Schott Borofloat® 33 is a high-quality borosilicate glass known for its outstanding properties, making it suitable for various applications. BF33 is Manufactured using the advanced Microfloat process. It is a transparent, colorless glass features excellent optical quality, a smooth surface, and high flatness.
Schott Borofloat® 33 is a high-quality borosilicate glass known for its outstanding properties, making it suitable for various applications. BF33 is Manufactured using the advanced Microfloat process. It is a transparent, colorless glass features excellent optical quality, a smooth surface, and high flatness.
Borofloat 33 achieves a transmission rate exceeding 90% and has minimal fluorescence across the light spectrum. These qualities make it ideal for optics, optoelectronics, and photonics. Its low thermal expansion and high thermal shock resistance allow it to withstand temperatures up to 450°C, ensuring stability in temperature-sensitive applications.
This glass also resists water, acids, and alkalis, making it well-suited for the chemical industry and analytical technology. Notably, Borofloat33 is widely used in silicon wafer anodic bonding, providing excellent compatibility with silicon substrates for microelectronics and biotechnology.
CQT GROUP offers Schott BF 33 substrates in sizes ranging from 3 inches to 12 inches, meeting diverse industry needs.
| Chemical composition | |
| B2O3 | 13% |
| Na2O/K2O | 4% |
| AI2O3 | 2% |
| SiO2 | 81% |
The general specs are as follows sheet, if your specified is not included with it, you may freely tell us and we’ll pleased to customize them for you.
| spec | unit | 4" | 6" | 8" | 10" | 12” |
| Diameter/size(or square) | mm | 100 | 150 | 200 | 250 | 300 |
| Tolerance (±) | mm | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Thickness | mm | 0.10 or more | 0.30 or more | 0.40 or more | 0.50 or more | 0.50 or more |
| Primary reference flat | mm | 32.5 | 57.5 | Semi-notch | Semi-notch | Semi-notch |
| LTV (5mmx5mm) | µm | < 0.5 | < 0.5 | < 0.5 | < 0.5 | < 0.5 |
| TTV | µm | < 2 | < 3 | <3 | <5 | <5 |
| Bow | µm | ±20 | ±30 | ±40 | ±40 | ±40 |
| Warp | µm | ≤ 30 | ≤ 40 | ≤ 50 | ≤ 50 | ≤ 50 |
| PLTV(5mm*5mm)<0.4um | % | ≥95% | ≥95% | ≥95% | ≥95% | ≥95% |
| Edge Rounding | mm | Compliant with SEMI M1.2 Standard/refer to IEC62276 | ||||
| Surface Type | Single Side Polished /Double Sides Polished | |||||
| Polished side Ra | nm | ≤1 | ||||
| Back Side Criteria | µm | general 0.2-0.7 or customized | ||||
Schott Borofloat® 33 Wafers are premium borosilicate glass substrates manufactured using SCHOTT's advanced Microfloat® process, delivering exceptional optical quality, excellent surface flatness, superior thermal stability, and outstanding chemical resistance. These characteristics make Borofloat 33 one of the most widely used glass wafer materials for MEMS, semiconductor packaging, anodic bonding, microfluidics, photonics, optics, biomedical devices, and analytical instrumentation.
At CQT GROUP, we supply high-quality Schott Borofloat 33 glass wafers in a wide range of diameters from 3-inch to 12-inch, with custom thicknesses, precision polishing, double-side polishing (DSP), laser cutting, and customized specifications to meet demanding industrial and research applications.
Borofloat® 33 is a high-performance borosilicate float glass developed by SCHOTT. Manufactured through a continuous Microfloat process, it combines the advantages of traditional borosilicate glass with significantly improved dimensional accuracy, optical clarity, and surface quality.
Compared with conventional borosilicate glass, Borofloat 33 offers:
Excellent optical transmission
Ultra-low thermal expansion
High thermal shock resistance
Outstanding chemical durability
Superior mechanical stability
Extremely smooth surface
Excellent wafer flatness
Low autofluorescence
High compatibility with silicon anodic bonding
These properties make Borofloat 33 one of the preferred substrate materials for advanced microfabrication technologies.
Exceptional Optical Quality
Borofloat 33 is completely colorless and highly transparent, providing over 90% light transmission throughout the visible spectrum.
Its extremely low distortion and excellent optical homogeneity make it suitable for demanding optical systems requiring accurate light propagation.
Benefits include:
High visible light transmission
Low optical absorption
Excellent optical uniformity
Low birefringence
High imaging quality
Excellent Surface Flatness
The Microfloat manufacturing process produces wafers with outstanding surface quality and exceptional flatness.
Advantages include:
Mirror-like surface finish
Low surface roughness
High parallelism
Excellent thickness uniformity
Ideal for precision lithography and microfabrication
Low Thermal Expansion
Borofloat 33 has a coefficient of thermal expansion close to silicon, reducing thermal stress during fabrication.
Benefits include:
Stable dimensions
Reduced stress during processing
High dimensional accuracy
Improved bonding reliability
High Thermal Shock Resistance
The material withstands rapid temperature changes without cracking.
Operating advantages:
Continuous operating temperature up to approximately 450°C
High resistance to thermal cycling
Suitable for vacuum processing
Stable under semiconductor manufacturing conditions
Outstanding Chemical Resistance
Borofloat 33 exhibits exceptional resistance against:
Water
Humidity
Most acids
Organic solvents
Many alkaline environments
This makes it suitable for aggressive laboratory and industrial environments.
MEMS Manufacturing
Borofloat 33 is widely used as a substrate in MEMS fabrication because of its compatibility with silicon processing.
Applications include:
Pressure sensors
Accelerometers
MEMS microphones
Optical MEMS
Inertial sensors
Silicon Anodic Bonding
Borofloat 33 is one of the industry's preferred materials for anodic bonding with silicon wafers.
Advantages:
Excellent thermal expansion matching
Strong bonding strength
High process stability
Low defect rates
Long-term reliability
Common applications include:
MEMS packaging
Microfluidic chips
Biomedical devices
Wafer-level packaging
Microfluidics
Its transparency and chemical stability make Borofloat 33 ideal for lab-on-a-chip devices.
Applications include:
Microfluidic chips
Cell analysis
DNA sequencing
PCR devices
Chemical reactors
Biomedical diagnostics
Optical Components
Borofloat 33 is extensively used in precision optical systems.
Products include:
Optical windows
Filters
Beam splitters
Lens substrates
Optical mirrors
Camera protection windows
Laser optics
Photonics
Its excellent optical performance supports advanced photonic applications.
Examples include:
Optical sensors
Waveguides
Photonic integrated devices
Laser systems
Fiber optic components
Semiconductor Industry
Borofloat 33 is widely used in semiconductor manufacturing.
Applications:
Wafer carriers
Temporary bonding substrates
Packaging lids
Cover glass
Inspection windows
Process carriers
Biomedical Devices
Low fluorescence and excellent biocompatibility make Borofloat 33 suitable for medical research.
Applications include:
Biochips
DNA microarrays
Medical sensors
Diagnostic equipment
Cell culture devices
Microscope slides
Analytical Instruments
The material is commonly used in laboratory equipment.
Applications include:
Spectroscopy
Chromatography
Optical analysis
Precision measurement
Scientific instruments
CQT GROUP supplies precision Borofloat 33 glass wafers for research institutes, semiconductor manufacturers, universities, and industrial customers worldwide.
Our advantages include:
Genuine Schott Borofloat® 33 material
Wafer sizes from 3" to 12"
Custom thicknesses available
Precision polishing services
Excellent flatness and surface quality
Tight dimensional tolerances
Custom machining capabilities
Fast global delivery
Technical engineering support
Strict quality inspection before shipment
In addition to standard wafers, we provide customized fabrication services, including:
Custom wafer diameters
Custom thicknesses
Precision dicing
Laser cutting
Edge grinding
Hole drilling
Through-glass vias (TGV-ready processing)
Surface coating preparation
Cleanroom cleaning
OEM & ODM manufacturing
Compared with conventional glass substrates, Schott Borofloat® 33 offers a unique combination of optical clarity, thermal stability, chemical durability, and excellent process compatibility. Its ability to achieve reliable anodic bonding with silicon makes it one of the most trusted glass wafer materials for semiconductor, MEMS, optics, photonics, and biomedical industries.
Whether your application requires ultra-flat substrates for precision lithography, chemically resistant wafers for analytical systems, or optically transparent glass for advanced photonic devices, Schott Borofloat® 33 Wafers from CQT GROUP deliver consistent performance, exceptional quality, and reliable manufacturing support.
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