Coring FTO Coated Glass – FTO Coated Glass (CTE substrate dependent, 80 – 82% visible @ 7 ohm/sq); Coring to diameter +/-0.05 mm. No minimum order; DFM review included with every RFQ.
Ask any process engineer what makes fto coated glass difficult and the answer is specific: the harder FTO film abrades diamond tooling faster and edges need post-cut inspection for film lift. Our coring line is tooled around exactly that – diamond core drills with rotary fixtures – holding diameter +/-0.05 mm on parts from 1 – 60 mm thick.
Specification envelope
| Material | FTO Coated Glass (TEC-7, TEC-15 equivalents) |
|---|---|
| Thermal expansion (CTE) | substrate dependent |
| Service temperature | 600 C (coating stable) |
| Transmission range | 80 – 82% visible @ 7 ohm/sq |
| Density | 2.23 – 2.50 g/cm3 |
| Knoop hardness | harder film than ITO |
| Refractive index | ~2.0 (FTO film) |
| Stock thickness | 1.1 – 3.2 mm substrates |
| Maximum blank size | 360 x 300 mm |
| Process | Coring |
| Working tolerance | diameter +/-0.05 mm |
| Minimum feature | 2 mm core diameter |
| Surface finish | ground bore, honed option |
| Thickness window | 1 – 60 mm |
| Edge condition | entry/exit chamfer standard |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Process window
Coring earns its place through large-diameter discs, rings and through-bores from plate stock up to 60 mm thick. Its boundary condition – wall thickness between adjacent cores should exceed 2 mm to avoid bridge cracking – is the first thing our DFM review checks.
Beyond this page, FTO Coated Glass routinely runs through etching, cnc machining, dicing in our shop – most real parts combine two or three of these steps.
DFM notes from the shop floor
Three items decide most of the cost and lead time on this work:
- Material note: the harder FTO film abrades diamond tooling faster and edges need post-cut inspection for film lift.
- Process boundary: wall thickness between adjacent cores should exceed 2 mm to avoid bridge cracking.
- 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
Orders for coring fto coated glass cluster in laser systems (windows, beam splitters, debris shields); machine vision (camera windows, ring-light diffusers, calibration plates); semiconductor equipment (view ports, wafer carriers, plasma rings, chamber windows). Background reading on the underlying material science: ScienceDirect: FTO 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.
For adjacent specifications, see FTO conductive glass, custom FTO glass, optical glass options.
Common questions
What tolerances are achievable on FTO Coated Glass parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. The harder FTO film abrades diamond tooling faster and edges need post-cut inspection for film lift.
What thickness range do you stock for FTO Coated Glass?
Standard stock spans 1.1 – 3.2 mm substrates, with blanks up to 360 x 300 mm. Other formats are sourced per order.
How does FTO Coated Glass behave under heat?
CTE is substrate dependent and continuous service reaches 600 C (coating stable), which is what drives its use where thermal stability beyond ITO matters.
What accuracy does coring hold?
Diameter +/-0.05 mm with minimum features of 2 mm core diameter. Wall thickness between adjacent cores should exceed 2 mm to avoid bridge cracking.
Specifications on this page were last reviewed by our engineering team in July 2026.