Fused Silica Glass Rings – Fused Silica (CTE 0.55 x 10^-6 /K, 185 nm – 2.5 um); OD 5 – 300 mm, wall from 1.5 mm. No minimum order; DFM review included with every RFQ.
fused silica 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 Fused Silica.
Specifications at a glance
| Material | Fused Silica (JGS1 (UV), JGS2 (standard), JGS3 (IR)) |
|---|---|
| Thermal expansion (CTE) | 0.55 x 10^-6 /K |
| Service temperature | 1,100 C continuous |
| Transmission range | 185 nm – 2.5 um |
| Density | 2.20 g/cm3 |
| Knoop hardness | 500 kg/mm2 |
| Refractive index | 1.458 @ 587 nm |
| Stock thickness | 0.10 – 50 mm |
| Maximum blank size | 450 x 450 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 Fused Silica we also quote coring, grinding, laser cutting, lapping, 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.
DFM notes from the shop floor
Three items decide most of the cost and lead time on this work:
- Material note: its hardness and brittleness demand diamond tooling and controlled feeds.
- 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.
Who orders this
Orders for fused silica glass rings cluster in optical sensors (sensor windows, filter caps, lens covers); laboratory instruments (cuvettes, sight glasses, stir-cell windows); mems devices (cap wafers, TGV substrates, motion-sensor lids). Background reading on the underlying material science: RP Photonics: fused silica.
Dimensions still moving? Configure this part live in the 3D + 2D builder below, or open the full custom glass machining 3D + 2D builder to start from a blank canvas.
For adjacent specifications, see tolerance design guide, surface quality guide, glass sandblasting.
Buyer questions, answered
Is there a minimum order for fused silica 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.
Specifications on this page were last reviewed by our engineering team in September 2026.