Quick answer: Lapping JGS2 Quartz Glass covers JGS2 Quartz Glass (CTE 0.55 x 10^-6 /K, 220 nm – 2.5 um); Lapping to flatness 1 – 3 um. Prototypes ship in 5-10 working days.
Ask any process engineer what makes jgs2 quartz glass difficult and the answer is specific: thicker blanks need stress-relief annealing before tight-flatness grinding. Our lapping line is tooled around exactly that – cast-iron lap plates with boron carbide and alumina slurries – holding flatness 1 – 3 um on parts from 0.2 – 40 mm thick.
Specification envelope
| 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 | Lapping |
| Working tolerance | flatness 1 – 3 um |
| Minimum feature | thickness +/-0.003 mm |
| Surface finish | Ra 0.2 – 0.6 um matte |
| Thickness window | 0.2 – 40 mm |
| Edge condition | not applicable |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Process window
Lapping earns its place through restoring flatness and parallelism on plates and repairing bowed stock. Its boundary condition – lapped faces are translucent-matte; optical clarity requires a subsequent polish – is the first thing our DFM review checks.
Beyond this page, JGS2 Quartz Glass routinely runs through dicing, drilling, grinding, polishing in our shop – most real parts combine two or three of these steps.
Design guidance
Three items decide most of the cost and lead time on this work:
- Material note: thicker blanks need stress-relief annealing before tight-flatness grinding.
- Process boundary: lapped faces are translucent-matte; optical clarity requires a subsequent polish.
- 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 lapping jgs2 quartz glass cluster in semiconductor equipment (view ports, wafer carriers, plasma rings, chamber windows); microfluidic devices (chips, manifolds, via plates, bonded stacks); optical sensors (sensor windows, filter caps, lens covers). 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 fused silica wafers 2-12 inch, edge grinding overview, glass-bottom microplates.
Buyer questions, answered
What equipment runs the lapping work?
Cast-iron lap plates with boron carbide and alumina slurries.
Is there a minimum order for lapping 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.