Polishing D263 Thin Glass: D263 Thin Glass (CTE 7.2 x 10^-6 /K, 350 nm – 2.0 um); Polishing to flatness to lambda/4 per 25 mm. Single-piece prototypes to production volumes, quoted from your drawing.
Ask any process engineer what makes d263 thin glass difficult and the answer is specific: ultra-thin stock cannot take conventional clamping; parts are machined on wax or UV-tape carriers. Our polishing line is tooled around exactly that – pitch and polyurethane pad polishers with cerium oxide slurry – holding flatness to lambda/4 per 25 mm on parts from 0.2 – 50 mm thick.
Specification envelope
| Material | D263 Thin Glass (SCHOTT D 263 T eco) |
|---|---|
| Thermal expansion (CTE) | 7.2 x 10^-6 /K |
| Service temperature | 400 C (Tg 557 C) |
| Transmission range | 350 nm – 2.0 um |
| Density | 2.51 g/cm3 |
| Knoop hardness | 590 kg/mm2 |
| Refractive index | 1.523 @ 587 nm |
| Stock thickness | 0.03 – 1.1 mm |
| Maximum blank size | 440 x 360 mm |
| Process | Polishing |
| Working tolerance | flatness to lambda/4 per 25 mm |
| Minimum feature | Ra below 1 nm |
| Surface finish | scratch-dig 40/20 to 20/10 |
| Thickness window | 0.2 – 50 mm |
| Edge condition | polished bevels available |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Capabilities and limits
The core strength of Polishing is optical-grade faces with certified scratch-dig and interferometer-verified flatness. The honest limit: steep aspect parts and deep pockets polish unevenly; those faces are specified as fine-ground. Both belong on the drawing before quoting, not after.
One material, many routes: on D263 Thin Glass we also quote edge grinding, dicing, etching, and multi-step drawings are the norm rather than the exception.
Design guidance
Before sending the RFQ, check these against your drawing:
- Material note: ultra-thin stock cannot take conventional clamping; parts are machined on wax or UV-tape carriers.
- Process boundary: steep aspect parts and deep pockets polish unevenly; those faces are specified as fine-ground.
- 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.
Who orders this
The recurring buyers of polishing d263 thin glass: oled packaging (cover lids, frit-seal frames, fill-port plates); led packaging (groove covers, phosphor carriers, package windows); medical diagnostics (flow cells, slides, microplate bottoms, cuvette windows). Background reading on the underlying material science: SCHOTT D 263 thin glass.
Dimensions still moving? Configure this part live in the 3D builder below, or open the full custom glass machining 3D builder to start from a blank canvas.
Useful companion pages: optical polishing capability, glass wafer coring, FTO conductive glass.
Common questions
What tolerances are achievable on D263 Thin Glass parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Ultra-thin stock cannot take conventional clamping; parts are machined on wax or UV-tape carriers.
What thickness range do you stock for D263 Thin Glass?
Standard stock spans 0.03 – 1.1 mm, with blanks up to 440 x 360 mm. Other formats are sourced per order.
How does D263 Thin Glass behave under heat?
CTE is 7.2 x 10^-6 /K and continuous service reaches 400 C (Tg 557 C), which is what drives its use where down-drawn fire-polished surfaces matters.
What accuracy does polishing hold?
Flatness to lambda/4 per 25 mm with minimum features of Ra below 1 nm. Steep aspect parts and deep pockets polish unevenly; those faces are specified as fine-ground.
Specifications on this page were last reviewed by our engineering team in July 2026.