Quick answer: Borofloat 33 Glass Frames covers Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); Window cutouts with 2 mm minimum web. Prototypes ship in 5-10 working days.
borofloat 33 glass frames are ordered for bezels, gasket carriers and bonded lids. The geometry envelope is Window cutouts with 2 mm minimum web, held to cutout +/-0.05 mm, in Borofloat 33.
Specifications at a glance
| Material | Borofloat 33 (SCHOTT float production, wafer grade) |
|---|---|
| Thermal expansion (CTE) | 3.25 x 10^-6 /K |
| Service temperature | 450 C continuous |
| Transmission range | 350 nm – 2.0 um |
| Density | 2.23 g/cm3 |
| Knoop hardness | 480 kg/mm2 |
| Refractive index | 1.471 @ 587 nm |
| Stock thickness | 0.70 – 25.4 mm |
| Maximum blank size | 500 x 500 mm |
| Geometry | Glass Frames |
| Size envelope | Window cutouts with 2 mm minimum web |
| Key tolerance | cutout +/-0.05 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Process window
Beyond this page, Borofloat 33 routinely runs through laser cutting, sandblasting, edge grinding, coring in our shop – most real parts combine two or three of these steps.
Production route: cnc machining, laser cutting – selected per geometry and volume. Edge condition: chamfered 0.1 – 0.5 mm as standard.
Getting the drawing right
The shop-floor rules that matter here:
- Material note: float tin side must be tracked when parts see coating or bonding steps.
- Hold the controlling dimension (cutout +/-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.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Where these parts end up
borofloat 33 glass frames shows up across microfluidic devices (chips, manifolds, via plates, bonded stacks); led packaging (groove covers, phosphor carriers, package windows); machine vision (camera windows, ring-light diffusers, calibration plates). Background reading on the underlying material science: SCHOTT BOROFLOAT product page.
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: fused silica material guide, fused silica wafers 2-12 inch, precision glass grinding.
Buyer questions, answered
Is there a minimum order for borofloat 33 glass frames?
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.