Dichroic Coating Borofloat 33 – Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); cut-on/cut-off slopes < 2% of edge wavelength. No minimum order; DFM review included with every RFQ.
The point of dichroic coating borofloat 33 is simple: wavelength-selective reflection and transmission. We deposit it by ion-beam sputtering, 40 – 120 layers onto Borofloat 33 and verify cut-on/cut-off slopes < 2% of edge wavelength on every lot.
The numbers
| 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 | Dichroic Coating – thin-film interference stack |
| Specification | cut-on/cut-off slopes < 2% of edge wavelength |
| Deposition / method | ion-beam sputtering, 40 – 120 layers |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
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.
- Sequence matters: all machining happens before dichroic 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.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Manufacturing capability
One material, many routes: on Borofloat 33 we also quote grinding, etching, lapping, laser cutting, and multi-step drawings are the norm rather than the exception.
Typical applications
dichroic coating borofloat 33 shows up across mems devices (cap wafers, TGV substrates, motion-sensor lids); optical sensors (sensor windows, filter caps, lens covers); led packaging (groove covers, phosphor carriers, package windows). 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: Borofloat 33 selection guide, 4 inch Borofloat wafers, glass hole micromachining.
Frequently asked questions
Is there a minimum order for dichroic 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.