Optical Glass Square Glass Windows: Optical Glass (CTE 7.1 x 10^-6 /K, 350 nm – 2.0 um); 5 x 5 mm to 300 x 300 mm, thickness 0.3 – 25 mm. Single-piece prototypes to production volumes, quoted from your drawing.
A drawing for optical glass square glass windows is mostly a conversation about edges and datums. We produce them in Optical Glass at 5 x 5 mm to 300 x 300 mm, thickness 0.3 – 25 mm, with side +/-0.03 mm as the controlling tolerance, and finish the perimeter per spec.
The numbers
| Material | Optical Glass (N-BK7, H-K9L and filter glass sets) |
|---|---|
| Thermal expansion (CTE) | 7.1 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 | 610 kg/mm2 |
| Refractive index | 1.5168 @ 587 nm |
| Stock thickness | 0.30 – 50 mm |
| Maximum blank size | 300 mm diameter |
| Geometry | Square Glass Windows |
| Size envelope | 5 x 5 mm to 300 x 300 mm, thickness 0.3 – 25 mm |
| Key tolerance | side +/-0.03 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Specification advice
Three items decide most of the cost and lead time on this work:
- Material note: index-certified blanks must be oriented and serialized through the shop to keep melt traceability.
- Hold the controlling dimension (side +/-0.03 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.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Process window
Beyond this page, Optical Glass routinely runs through etching, coring, ultrasonic machining, edge grinding in our shop – most real parts combine two or three of these steps.
Production route: cnc machining, polishing, edge grinding – selected per geometry and volume. Edge condition: chamfered 0.1 – 0.5 mm as standard.
Where these parts end up
optical glass square glass windows shows up across ccd inspection equipment (CCD cover plates, reference grids, stage glass); optical sensors (sensor windows, filter caps, lens covers); scientific instruments (reference flats, cells, prism mounts, stage inserts). Background reading on the underlying material science: RP Photonics: optical glass.
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: optical polishing capability, CCD screening plates, JGS1 quartz glass.
Buyer questions, answered
Is there a minimum order for optical glass square glass windows?
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.