Polishing JGS2 Quartz Glass – JGS2 Quartz Glass (CTE 0.55 x 10^-6 /K, 220 nm – 2.5 um); Polishing to flatness to lambda/4 per 25 mm. No minimum order; DFM review included with every RFQ.
The combination of JGS2 Quartz Glass and Polishing comes up constantly in RFQs for a reason – the material offers lower oh than jgs1, and Polishing is the right way to get accurate geometry into it. Expect flatness to lambda/4 per 25 mm and scratch-dig 40/20 to 20/10.
The numbers
| Material | JGS2 Quartz Glass (Optical grade, bubble class 1) |
|---|---|
| Thermal expansion (CTE) | 0.55 x 10^-6 /K |
| Service temperature | 1,100 C continuous |
| Transmission range | 220 nm – 2.5 um |
| Density | 2.20 g/cm3 |
| Knoop hardness | 500 kg/mm2 |
| Refractive index | 1.458 @ 587 nm |
| Stock thickness | 0.20 – 40 mm |
| Maximum blank size | 300 mm diameter |
| Process | Polishing |
| Working tolerance | flatness to lambda/4 per 25 mm |
| Minimum feature | Ra below 1 nm |
| Surface finish | scratch-dig 40/20 to 20/10 |
| Thickness window | 0.2 – 50 mm |
| Edge condition | polished bevels available |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Specification advice
Before sending the RFQ, check these against your drawing:
- Material note: thicker blanks need stress-relief annealing before tight-flatness grinding.
- Process boundary: steep aspect parts and deep pockets polish unevenly; those faces are specified as fine-ground.
- 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
Polishing earns its place through optical-grade faces with certified scratch-dig and interferometer-verified flatness. Its boundary condition – steep aspect parts and deep pockets polish unevenly; those faces are specified as fine-ground – is the first thing our DFM review checks.
Beyond this page, JGS2 Quartz Glass routinely runs through lapping, etching, dicing, ultrasonic machining in our shop – most real parts combine two or three of these steps.
Where these parts end up
polishing jgs2 quartz glass shows up across scientific instruments (reference flats, cells, prism mounts, stage inserts); mems devices (cap wafers, TGV substrates, motion-sensor lids); aerospace optics (sensor windows, star-tracker flats, radiation-tolerant ports). Background reading on the underlying material science: ScienceDirect: fused quartz.
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 optical polishing capability, fused silica wafers 2-12 inch, AR coating process.
Frequently asked questions
What equipment runs the polishing work?
Pitch and polyurethane pad polishers with cerium oxide slurry.
Is there a minimum order for polishing jgs2 quartz 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.
Specifications on this page were last reviewed by our engineering team in September 2026.