Quick answer: Borofloat 33 Perforated Glass Plates covers Borofloat 33 (CTE 3.25 x 10^-6 /K, 350 nm – 2.0 um); Hole grids from 0.15 mm diameter, pitch from 0.5 mm. Prototypes ship in 5-10 working days.
borofloat 33 perforated glass plates are ordered for airflow sensors, filtration and vacuum chucks. The geometry envelope is Hole grids from 0.15 mm diameter, pitch from 0.5 mm, held to hole position +/-0.02 mm, in Borofloat 33.
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 |
| Geometry | Perforated Glass Plates |
| Size envelope | Hole grids from 0.15 mm diameter, pitch from 0.5 mm |
| Key tolerance | hole position +/-0.02 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Design guidance
Three items decide most of the cost and lead time on this work:
- Material note: float tin side must be tracked when parts see coating or bonding steps.
- Hold the controlling dimension (hole position +/-0.02 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.
The full rules live in our tolerance design guide and holes and edges design guide.
Manufacturing capability
One material, many routes: on Borofloat 33 we also quote polishing, coring, sandblasting, drilling, and multi-step drawings are the norm rather than the exception.
Production route: drilling, laser cutting, ultrasonic machining – selected per geometry and volume. Edge condition: optional chamfered hole entry.
Who orders this
The recurring buyers of borofloat 33 perforated glass plates: led packaging (groove covers, phosphor carriers, package windows); machine vision (camera windows, ring-light diffusers, calibration plates); mems devices (cap wafers, TGV substrates, motion-sensor lids). 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.
Engineers scoping this work usually also review 4 inch Borofloat wafers, perforated quartz plates, ITO coated glass.
Common questions
Is there a minimum order for borofloat 33 perforated glass plates?
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.