8 Inch (200 mm) Borofloat 33 Wafers: Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); 200 mm format, TTV <4 um. Single-piece prototypes to production volumes, quoted from your drawing.
8 inch (200 mm) borofloat 33 wafers are supplied as finished substrates: edge-rounded, cleaned and packed in wafer cassettes. The material brings float-glass flatness off the line and anodic bonding to silicon; the format brings SEMI-compatible handling.
Specifications at a glance
| Material | Borofloat 33 (SCHOTT float production, wafer grade) |
|---|---|
| Thermal expansion (CTE) | 3.25 x 10^-6 /K |
| Service temperature | 450 C continuous |
| Transmission range | 350 nm – 2.0 um |
| Density | 2.23 g/cm3 |
| Knoop hardness | 480 kg/mm2 |
| Refractive index | 1.471 @ 587 nm |
| Stock thickness | 0.70 – 25.4 mm |
| Maximum blank size | 500 x 500 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 |
What the process holds
Beyond this page, Borofloat 33 routinely runs through lapping, drilling, ultrasonic machining, laser cutting in our shop – most real parts combine two or three of these steps.
DFM notes from the shop floor
The shop-floor rules that matter here:
- Material note: float tin side must be tracked when parts see coating or bonding steps.
- 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.
Where these parts end up
Orders for 8 inch (200 mm) borofloat 33 wafers cluster in mems devices (cap wafers, TGV substrates, motion-sensor lids); microfluidic devices (chips, manifolds, via plates, bonded stacks); optical sensors (sensor windows, filter caps, lens covers). Background reading on the underlying material science: SCHOTT BOROFLOAT product page.
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: Borofloat 33 selection guide, 4 inch Borofloat wafers, special-shaped glass plates.
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 Borofloat 33 parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Float tin side must be tracked when parts see coating or bonding steps.
Specifications on this page were last reviewed by our engineering team in September 2026.