Quick answer: Borofloat 33 With Edge Notches covers Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); notch width from 0.5 mm, positioned +/-0.05 mm. Prototypes ship in 5-10 working days.
Buyers come to borofloat 33 with edge notches with two kinds of parts: catalog-adjacent blanks that need accurate finishing, and genuinely custom geometry. We quote both from the same dataset – SCHOTT float production, wafer grade stock in 0.70 – 25.4 mm, blanks to 500 x 500 mm.
Specification envelope
| 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 |
| Feature | Edge Notches |
| Capability | notch width from 0.5 mm, positioned +/-0.05 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
What the process holds
Beyond this page, Borofloat 33 routinely runs through laser cutting, coring, dicing, ultrasonic machining in our shop – most real parts combine two or three of these steps.
These features are produced by cnc machining or laser cutting. Capability: notch width from 0.5 mm, positioned +/-0.05 mm. Design rule worth copying onto the drawing: radius every internal notch corner – sharp corners crack.
Design guidance
Before sending the RFQ, check these against your drawing:
- Material note: float tin side must be tracked when parts see coating or bonding steps.
- Feature rule: radius every internal notch corner – sharp corners crack.
- 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.
Where these parts end up
The recurring buyers of borofloat 33 with edge notches: led packaging (groove covers, phosphor carriers, package windows); machine vision (camera windows, ring-light diffusers, calibration plates); microfluidic devices (chips, manifolds, via plates, bonded stacks). Background reading on the underlying material science: SCHOTT BOROFLOAT product page.
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 Borofloat 33 selection guide, 4 inch Borofloat wafers, CCD screening plates.
Common questions
How does Borofloat 33 behave under heat?
CTE is 3.25 x 10^-6 /K and continuous service reaches 450 C continuous, which is what drives its use where float-glass flatness off the line matters.
What is the design rule for edge notches?
Radius every internal notch corner – sharp corners crack.
Is there a minimum order for borofloat 33 with edge notches?
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.
Specifications on this page were last reviewed by our engineering team in August 2026.