Tempered Glass vs Chemically Strengthened Glass: How to Choose: custom precision glass machined to drawing with inspection reports. Single-piece prototypes to production volumes, quoted from your drawing.
Engineers rarely need a winner in tempered glass vs chemically strengthened glass: how to choose – they need the boundary. It runs along thick-panel safety versus thin-cover strength: thermal temper above 3 mm; ion exchange below 2 mm and for tight flatness.
Side by side
| Soda-Lime Glass | Thermal Tempering | |
|---|---|---|
| CTE | 9.0 x 10^-6 /K | – |
| Service temp | 350 C continuous | – |
| Transmission | 360 nm – 2.0 um | – |
| Hardness | 585 kg/mm2 | – |
| Density | 2.50 g/cm3 | – |
| Signature trait | lowest cost per square meter | – |
| What it is | – | full thermal temper |
| Specification | – | surface compression > 69 MPa per ASTM C1048 |
| Method | – | furnace + air quench, >3 mm parts |
| Benefit | – | safety-glass fracture and 4x strength |
The decision axis is thick-panel safety versus thin-cover strength. Thermal temper above 3 mm; ion exchange below 2 mm and for tight flatness.
Design guidance
Before sending the RFQ, check these against your drawing:
- 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.
Typical applications
tempered glass vs chemically strengthened glass: how to choose shows up across optical sensors (sensor windows, filter caps, lens covers); aerospace optics (sensor windows, star-tracker flats, radiation-tolerant ports); laser systems (windows, beam splitters, debris shields).
Prefer to sketch it? Our custom glass machining 3D + 2D builder accepts your dimensions directly and routes them to engineering.
Related reading on this site: ITO coating process, surface quality guide, fused silica wafers 2-12 inch.
Buyer questions, answered
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.
Which should I choose?
As a rule: thermal temper above 3 mm; ion exchange below 2 mm and for tight flatness. Borderline cases are worth a materials review with our engineers.
Is there a minimum order for tempered glass vs chemically strengthened glass: how to choose?
No. Single prototypes are accepted, and pricing steps down at 10, 100 and 1,000 pieces.
Specifications on this page were last reviewed by our engineering team in August 2026.