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This scratch resistant sapphire window is built for semiconductor equipment viewports, where process chambers expose windows to plasma, particle abrasion, and aggressive cleaning chemicals. The window is fabricated from single crystal sapphire with a Mohs hardness of 9, second only to diamond, which allows it to maintain a clean optical surface far longer than glass or quartz viewports.
For wafer processing tools that run continuously, the scratch resistant sapphire window reduces maintenance downtime and keeps inspection imaging consistent over the life of the chamber. Semiconductor environments demand more than hardness, which is why this sapphire window is also specified for chemical resistance to acids, bases, and plasma chemistries, plus thermal stability across the temperature swings of process cycling.
Each window is polished to a 60-40 scratch-dig surface quality with a flatness of lambda over 4, and edge profiles are ground and beveled to avoid stress concentrations in the mounting flange. Custom diameters from 10mm to 200mm and thicknesses matched to vacuum or atmospheric pressure ratings are available, and each shipment includes material certificates and dimensional inspection records for equipment qualification.
Technical Specifications
Product Name
Scratch Resistant Sapphire Window
Material
Single Crystal Sapphire Al2O3
Hardness
Mohs 9
Diameter
Custom 10mm - 200mm
Thickness
1.0mm - 8.0mm Custom
Surface Quality
60-40 Scratch-Dig
Flatness
Lambda/4 @ 632.8nm
Chemical Resistance
Acid, Base, and Plasma Resistant
Application
Semiconductor Wafer Processing
Certificate
RoHS Compliant, ISO 9001:2015
Key Advantages
Mohs 9 hardness resists particle and plasma-induced scratching
Chemical inertness survives aggressive chamber cleaning chemistries
Thermal stability handles process temperature cycling without fracture
Beveled ground edges reduce stress concentration in the mounting flange
Long service life cuts viewport replacement frequency and downtime
Material certificates support semiconductor equipment qualification
Custom sizes match vacuum and atmospheric process viewports
Consistent optical clarity for wafer inspection through the window
The scratch resistant sapphire window is designed around the real operating conditions of semiconductor fabrication: repeated chamber opens, plasma cleans, and abrasive particle flows. Field data from equipment service programs shows that sapphire viewports typically outlast quartz by several times in etch and deposition tools, which directly reduces the cost of ownership for fab operators.
The window is also suitable for adjacent industries that share the same harsh environment profile, including flat panel display processing, solar cell manufacturing, and vacuum coating systems. Design engineers receive mounting guidance, including recommended flange tolerances and seal materials, so the scratch resistant sapphire window integrates into existing viewport designs without rework.
Product Q&A
Q: Why do semiconductor viewports need sapphire instead of quartz?
Process chambers generate plasma, particles, and reactive chemistries that quickly etch and scratch quartz viewports, clouding the optical path. Sapphire with Mohs 9 hardness resists this damage for much longer cycles, and its chemical inertness prevents degradation from cleaning agents. The result is fewer viewport changes and more stable inspection conditions.
Q: What pressure ratings can the window support?
The pressure rating depends on diameter, thickness, and mounting design. For typical 25mm to 100mm viewports, thicknesses from 2mm to 8mm support vacuum to several bar of differential pressure. We provide recommended thickness calculations for your specific chamber conditions.
Q: Can the window be coated for anti-reflection in the visible range?
Yes. While many semiconductor viewports use uncoated sapphire for maximum robustness, we can apply a durable AR coating for visible inspection wavelengths when higher transmission is needed. The coating is validated for plasma and chemical exposure before release.
Q: What documentation is provided for equipment qualification?
Each shipment includes sapphire material certificates, dimensional inspection reports, surface quality records, and RoHS declarations. For qualified programs we can also provide batch-level chemical resistance test data and thermal cycling results.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2009
Total Annual:
8000000-10000000
Employee Number:
65~100
Ecer Certification：
Verified Supplier
1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-... 1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-...
