AR Coating Borofloat 33: Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um). Single-piece prototypes to production volumes, quoted from your drawing.
ar coating borofloat 33 is anti-reflective multilayer applied by ion-assisted e-beam deposition. On Borofloat 33 it raises transmission from ~92% to above 99% – the specification we run to is R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um).
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 |
| Treatment | AR Coating – anti-reflective multilayer |
| Specification | R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um) |
| Deposition / method | ion-assisted e-beam deposition |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Capabilities and limits
One material, many routes: on Borofloat 33 we also quote drilling, ultrasonic machining, edge grinding, cnc machining, and multi-step drawings are the norm rather than the exception.
DFM notes from the shop floor
The shop-floor rules that matter here:
- Material note: float tin side must be tracked when parts see coating or bonding steps.
- Sequence matters: all machining happens before ar coating; post-coating rework is not economical.
- 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.
Application context
ar coating borofloat 33 shows up across machine vision (camera windows, ring-light diffusers, calibration plates); microfluidic devices (chips, manifolds, via plates, bonded stacks); optical sensors (sensor windows, filter caps, lens covers). 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: JGS1 quartz glass, glass hole micromachining, alkali-free display glass.
Common questions
Is there a minimum order for ar coating borofloat 33?
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.
What tolerances are achievable on Borofloat 33 parts?
Ground features hold +/-0.01 mm and lapped thickness reaches +/-0.003 mm. Float tin side must be tracked when parts see coating or bonding steps.
Specifications on this page were last reviewed by our engineering team in September 2026.