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Pricing & Ordering

Unit $
1/4" (6mm)

Product Description

Chemically strengthened glass is a type of glass that has increased strength as a result of a post-production chemical process. When broken, it still shatters in long pointed splinters similar to float glass. For this reason, it is not considered a safety glass and must be laminated if a safety glass is required. However, chemically strengthened glass is typically six to eight times the strength of float glass. The glass is chemically strengthened by a surface finishing process. Glass is submersed in a bath containing a potassium salt (typically potassium nitrate) at 300°C (572°F). This causes sodium ions in the glass surface to be replaced by potassium ions from the bath solution. These potassium ions are larger than the sodium ions and therefore wedge into the gaps left by the smaller sodium ions when they migrate to the potassium nitrate solution. This replacement of ions causes the surface of the glass to be in a state of compression and the core in compensating tension. The surface compression of chemically strengthened glass may reach up to 690 MPa. There also exists a more advanced two-stage process for making chemically strengthened glass, in which the glass article is first immersed in a sodium nitrate bath at 450°C (842°F), which enriches the surface with sodium ions. This leaves more sodium ions on the glass for the immersion in potassium nitrate to replace with potassium ions. In this way, the use of a sodium nitrate bath increases the potential for surface compression in the finished article. Chemical strengthening results in a strengthening similar to toughened glass. However, the process does not use extreme variations of temperature and therefore chemically strengthened glass has little or no bow or warp, optical distortion or strain pattern. This differs from toughened glass, in which slender pieces can be significantly bowed. Also unlike toughened glass, chemically strengthened glass may be cut after strengthening, but loses its added strength within the region of approximately 20 mm of the cut. Similarly, when the surface of chemically strengthened glass is deeply scratched, this area loses its additional strength. Chemically strengthened glass was used for the aircraft canopy of some fighter aircraft.



True Reflection

Applications for a glass first surface mirror require a true reflection with no ghosting effect, also known as front surface mirrors.


96% Reflective

The enhanced aluminum mirror coating allows for a high reflection over a large wavelength range. See the wavechart for more detail.


Custom Sizes

We can cut and ship any size smaller than 70.886″ X 52.756″ and can ship across the globe! There is no minimum order to check out online.

Applications include use in flight simulators, barcode scanners, periscopes. They may also be used for projecting video onto the floor or ceiling, or Hollywood special effects. Photography also finds many uses for this mirror type that allows for a true reflection.

Wave Chart


Order a Sample

6″ x 6″ Chemically Strengthened Glass First Surface Mirror – 1/4″ (6mm) Thickness $14.95   
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