Wafer glass

When sourcing wafer glass, you must prioritize Total Thickness Variation (TTV) and Surface Roughness (Ra). For high-end applications, a TTV of <1μm and Ra <0.5nm are often required to ensure compatibility with lithography and bonding processes. Additionally, specify the Coefficient of Thermal Expansion (CTE) to match your substrate (e.g., Silicon) to prevent warping during thermal cycling. Common materials include Borosilicate (like Schott BF33), Fused Silica, and Aluminosilicate glass.

Verify that the supplier adheres to ISO 9001 for quality management and ISO 14001 for environmental standards. For the semiconductor industry, compliance with SEMI Standards (such as M1 for polished monocrystalline silicon wafers, adapted for glass) is critical. Ensure the product is RoHS and REACH compliant to avoid hazardous substances, and request a Certificate of Analysis (COA) for every batch to confirm chemical composition and physical properties.

Depending on your use case, you may need Edge Grinding (C-shape or R-shape) to reduce chipping and improve structural integrity. Discuss Laser Marking for wafer traceability and Anti-Reflective (AR) coatings if the glass is used for optical sensors. For MEMS packaging, inquire about Anodic Bonding compatibility. Most professional suppliers on Made-in-China.com can provide custom diameters ranging from 2 inches to 12 inches and thicknesses as thin as 0.1mm.

Wafer glass is primarily used in MEMS (Micro-Electro-Mechanical Systems), CMOS Image Sensors (CIS), and Wafer-Level Packaging (WLP). It also serves as a Carrier Wafer for thinning silicon wafers or as a substrate for Microfluidic chips and Biotechnology sensors. Its high transparency and chemical resistance make it ideal for Optoelectronic devices and AR/VR optical components.

The biggest risks are physical breakage and surface contamination. Ensure the supplier uses Class 100 (ISO 5) cleanroom packaging. Wafers should be housed in PP (Polypropylene) wafer cassettes or 'coin-style' single wafer shippers, then vacuum-sealed in anti-static bags. For shipping, insist on double-boxing with shock-absorbing foam and clearly labeled 'Fragile' and 'Keep Dry' indicators.

Utilize the Secured Trading services on Made-in-China.com to protect your payment until delivery is confirmed. When negotiating, focus on Volume-Based Tiered Pricing; for example, a 500-unit order may reduce costs by 15-20% compared to a 50-unit sample run. Always request a Pre-shipment Inspection (PSI) by a third party like SGS or Intertek to verify that the TTV and cleanliness meet your specifications before the final balance is paid.

Check the HS Code (typically 7006.00 or 7017.10) to determine import duties in your country. Be aware of Export Control regulations if the wafer glass is intended for high-level military or dual-use technology. Ensure all Incoterms (e.g., DAP or CIF) are clearly defined in the contract to avoid disputes over who bears the risk during transit across international borders.