8 Inch (200 mm) Fused Silica Wafers: Fused Silica (CTE 0.55 x 10^-6 /K, 185 nm – 2.5 um); 200 mm format, TTV <4 um. Single-piece prototypes to production volumes, quoted from your drawing.
A wafer is a specification bundle, not just a disc. 8 inch (200 mm) fused silica wafers here mean JGS1 (UV), JGS2 (standard), JGS3 (IR) material with certified CTE of 0.55 x 10^-6 /K, TTV controlled per format, and edges profiled for handler compatibility.
Key parameters
| Material | Fused Silica (JGS1 (UV), JGS2 (standard), JGS3 (IR)) |
|---|---|
| Thermal expansion (CTE) | 0.55 x 10^-6 /K |
| Service temperature | 1,100 C continuous |
| Transmission range | 185 nm – 2.5 um |
| Density | 2.20 g/cm3 |
| Knoop hardness | 500 kg/mm2 |
| Refractive index | 1.458 @ 587 nm |
| Stock thickness | 0.10 – 50 mm |
| Maximum blank size | 450 x 450 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 |
Getting the drawing right
The shop-floor rules that matter here:
- Material note: its hardness and brittleness demand diamond tooling and controlled feeds.
- 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.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Manufacturing capability
One material, many routes: on Fused Silica we also quote dicing, grinding, double-side polishing, ultrasonic machining, and multi-step drawings are the norm rather than the exception.
Who orders this
Orders for 8 inch (200 mm) fused silica wafers cluster in aerospace optics (sensor windows, star-tracker flats, radiation-tolerant ports); laser systems (windows, beam splitters, debris shields); semiconductor equipment (view ports, wafer carriers, plasma rings, chamber windows). Background reading on the underlying material science: RP Photonics: fused silica.
Dimensions still moving? Configure this part live in the 3D + 2D builder below, or open the full custom glass machining 3D + 2D builder to start from a blank canvas.
Useful companion pages: fused silica wafer applications, fused silica wafers 2-12 inch, beam splitter glass.
Common questions
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 Fused Silica parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Its hardness and brittleness demand diamond tooling and controlled feeds.
Specifications on this page were last reviewed by our engineering team in September 2026.