Borosilicate Glass Glass Rings: Borosilicate Glass (CTE 3.3 x 10^-6 /K, 360 nm – 2.0 um); OD 5 – 300 mm, wall from 1.5 mm. Single-piece prototypes to production volumes, quoted from your drawing.
borosilicate glass glass rings are ordered for plasma rings, spacer seals and lamp components. The geometry envelope is OD 5 – 300 mm, wall from 1.5 mm, held to concentricity 0.05 mm, in Borosilicate Glass.
Specification envelope
| 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 |
| Geometry | Glass Rings |
| Size envelope | OD 5 – 300 mm, wall from 1.5 mm |
| Key tolerance | concentricity 0.05 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Manufacturing capability
One material, many routes: on Borosilicate Glass we also quote coring, grinding, cnc machining, edge grinding, and multi-step drawings are the norm rather than the exception.
Production route: coring, cnc machining, grinding – selected per geometry and volume. Edge condition: entry/exit chamfer standard.
Design guidance
The shop-floor rules that matter here:
- Material note: sheet stock carries more thickness variation than float wafer stock, so lapping is often the first step.
- Hold the controlling dimension (concentricity 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.
Typical applications
borosilicate glass glass rings shows up across 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.
Engineers scoping this work usually also review AR coating process, high-temperature quartz windows, laser glass cutting.
Buyer questions, answered
Is there a minimum order for borosilicate glass glass rings?
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.
What tolerances are achievable on Borosilicate Glass parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Sheet stock carries more thickness variation than float wafer stock, so lapping is often the first step.
Specifications on this page were last reviewed by our engineering team in September 2026.