FTO Coating Borosilicate Glass: Borosilicate Glass (CTE 3.3 x 10^-6 /K, 360 nm – 2.0 um); 7 – 15 ohm/sq, stable to 600 C. Single-piece prototypes to production volumes, quoted from your drawing.
fto coating borosilicate glass is fluorine-doped tin oxide applied by spray pyrolysis on float line. On Borosilicate Glass it heat-tolerant conductive layer for cells and heaters – the specification we run to is 7 – 15 ohm/sq, stable to 600 C.
The numbers
| Material | Borosilicate Glass (3.3 expansion group per ISO 3585) |
|---|---|
| Thermal expansion (CTE) | 3.3 x 10^-6 /K |
| Service temperature | 450 C continuous |
| Transmission range | 360 nm – 2.0 um |
| Density | 2.23 g/cm3 |
| Knoop hardness | 480 kg/mm2 |
| Refractive index | 1.473 @ 587 nm |
| Stock thickness | 0.50 – 30 mm |
| Maximum blank size | 600 x 400 mm |
| Treatment | FTO Coating – fluorine-doped tin oxide |
| Specification | 7 – 15 ohm/sq, stable to 600 C |
| Deposition / method | spray pyrolysis on float line |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Getting the drawing right
Before sending the RFQ, check these against your drawing:
- Material note: sheet stock carries more thickness variation than float wafer stock, so lapping is often the first step.
- Sequence matters: all machining happens before fto coating; post-coating rework is not economical.
- 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 Borosilicate Glass we also quote laser cutting, sandblasting, lapping, edge grinding, and multi-step drawings are the norm rather than the exception.
Where these parts end up
The recurring buyers of fto coating borosilicate glass: medical diagnostics (flow cells, slides, microplate bottoms, cuvette windows); scientific instruments (reference flats, cells, prism mounts, stage inserts); laboratory instruments (cuvettes, sight glasses, stir-cell windows). Background reading on the underlying material science: ISO 3585 borosilicate glass 3.3.
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: FTO conductive glass, material selection guide, infrared windows.
Common questions
Is there a minimum order for fto coating borosilicate glass?
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.