Quick answer: 8 Inch (200 mm) Alkali-Free Glass Wafers covers Alkali-Free Glass (CTE 3.2 x 10^-6 /K, 350 nm – 2.0 um); 200 mm format, TTV <4 um. Prototypes ship in 5-10 working days.
A wafer is a specification bundle, not just a disc. 8 inch (200 mm) alkali-free glass wafers here mean AF32 / EAGLE-class display glass material with certified CTE of 3.2 x 10^-6 /K, TTV controlled per format, and edges profiled for handler compatibility.
The numbers
| Material | Alkali-Free Glass (AF32 / EAGLE-class display glass) |
|---|---|
| Thermal expansion (CTE) | 3.2 x 10^-6 /K |
| Service temperature | 600 C (Tg 717 C) |
| Transmission range | 350 nm – 2.0 um |
| Density | 2.43 g/cm3 |
| Knoop hardness | 590 kg/mm2 |
| Refractive index | 1.51 @ 587 nm |
| Stock thickness | 0.10 – 1.1 mm |
| Maximum blank size | 400 x 300 mm |
| Diameter / format | 200 mm |
| Thickness | 0.7 – 1.1 mm |
| TTV | <4 um |
| Flat / notch | SEMI notch |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
DFM notes from the shop floor
Before sending the RFQ, check these against your drawing:
- Material note: thin sheets below 0.3 mm demand carrier-supported handling through every step.
- Specify flat or notch orientation relative to your device layout – regrinding orientation later scraps the wafer.
- Over-specification is the quiet budget killer: a 20/10 scratch-dig face costs roughly three times an 80/50 face, so grade each surface individually.
The full rules live in our tolerance design guide and holes and edges design guide.
Process window
Beyond this page, Alkali-Free Glass routinely runs through grinding, drilling, dicing, laser cutting in our shop – most real parts combine two or three of these steps.
Where these parts end up
8 inch (200 mm) alkali-free glass wafers shows up across mems devices (cap wafers, TGV substrates, motion-sensor lids); oled packaging (cover lids, frit-seal frames, fill-port plates); ccd inspection equipment (CCD cover plates, reference grids, stage glass). Background reading on the underlying material science: SCHOTT AF 32 eco.
The fastest route to a quote is geometry: use the 3D builder below, draw a dimensioned 2D drawing from it, or open the site-wide custom glass machining 3D + 2D builder for fully custom parts.
Related reading on this site: alkali-free display glass, alkali-free glass wafers, LED groove cover glass.
Buyer questions, answered
How fast can prototypes ship?
Machined prototypes ship in 5 – 10 working days. Coated or bonded parts add 1 – 2 weeks depending on queue slots.
What files do you need for a quote?
A dimensioned PDF plus DXF or STEP geometry. If only a sketch exists, our drawing review service formalizes it before quoting.
Do parts ship with inspection data?
Dimensional reports, surface certificates and material certs per melt are available; specify the level on the RFQ.
What tolerances are achievable on Alkali-Free Glass parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Thin sheets below 0.3 mm demand carrier-supported handling through every step.
Specifications on this page were last reviewed by our engineering team in September 2026.