Quick answer: Alkali-Free Glass Glass Covers covers Alkali-Free Glass (CTE 3.2 x 10^-6 /K, 350 nm – 2.0 um); 0.1 – 3 mm thick, contours to drawing. Prototypes ship in 5-10 working days.
We build alkali-free glass glass covers to print – 0.1 – 3 mm thick, contours to drawing – primarily in Alkali-Free Glass. Typical use: display, sensor and LED package covers.
Specifications at a glance
| 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 |
| Geometry | Glass Covers |
| Size envelope | 0.1 – 3 mm thick, contours to drawing |
| Key tolerance | outline +/-0.05 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
What the process holds
Beyond this page, Alkali-Free Glass routinely runs through double-side polishing, drilling, cnc machining, etching in our shop – most real parts combine two or three of these steps.
Production route: laser cutting, cnc machining, edge grinding – selected per geometry and volume. Edge condition: filamentation edge, optional post-polish.
DFM notes from the shop floor
Three items decide most of the cost and lead time on this work:
- Material note: thin sheets below 0.3 mm demand carrier-supported handling through every step.
- Hold the controlling dimension (outline +/-0.05 mm) and let secondary dimensions carry standard tolerance – it is the single biggest cost lever.
- 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 alkali-free glass glass covers: ccd inspection equipment (CCD cover plates, reference grids, stage glass); oled packaging (cover lids, frit-seal frames, fill-port plates); mems devices (cap wafers, TGV substrates, motion-sensor lids). 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.
Engineers scoping this work usually also review fused silica wafers 2-12 inch, JGS1 quartz glass, CNC machining capability.
Buyer questions, answered
Is there a minimum order for alkali-free glass glass covers?
No. Single prototypes are accepted, and pricing steps down at 10, 100 and 1,000 pieces.
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.
Specifications on this page were last reviewed by our engineering team in September 2026.