TOUGHENED / TEMPERED GLASS

Tempered GlassRUNTAI TOUGHENED or TEMPERED GLASS is glass that has been processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempered glass is made by processes which create balanced internal stresses which give the glass strength. It will usually shatter into small fragments instead of sharp shards when broken, making it less likely to cause severe injury and deep lacerations. As a result of its safety and strength, tempered glass is used in a variety of demanding applications, including passenger vehicle windows, glass doors and tables, as a component of bulletproof glass, for diving masks, and various types of plates and cookware.Toughened glass is made from annealed glass via a thermal tempering process. The glass is placed onto a roller table, taking it through a furnace that heats it above its annealing point of about 720 °C. The glass is then rapidly cooled with forced air drafts while the inner portion remains free to flow for a short time.

An alternative chemical process involves forcing a surface layer of glass at least 0.1mm thick into compression by ion exchange of the sodium ions in the glass surface with the 30% larger potassium ions, by immersion of the glass into a bath of molten potassium nitrate. Chemical toughening results in increased toughness compared with thermal toughening, and can be applied to glass objects of complex shape.
Tampered Glass
Toughened glass is physically and thermally stronger than regular glass. The greater contraction of the inner layer during manufacturing induces compressive stresses in the surface of the glass balanced by tensile stresses in the body of the glass. For glass to be considered toughened, this compressive stress on the surface of the glass should be a minimum of 69 MPa. For it to be considered safety glass, the surface compressive stress should exceed 100 MPa. The greater the surface stress, the smaller the glass particles will be when broken. It is this compressive stress that gives the toughened glass increased strength. This is because any surface flaws tend to be pressed closed by the retained compressive forces, while the core layer remains relatively free of the defects which could cause a crack to begin. However, the toughened glass surface is not as hard as annealed glass and is therefore somewhat more susceptible to scratching. To prevent this, toughened glass manufacturers apply various coatings and/or laminates to the surface of the glass.

Tempered glass must be annealed to remove its internal stresses before cutting or grinding. The strain pattern resulting from tempering can be observed with polarized light or by using a pair of polarizing sun glasses.

Tempered Glass

Application & Uses


Safety approval markings on an automobile vent window made for a Chrysler car by PPG Toughened glass is used when strength, thermal resistance and safety are important considerations. The most commonly encountered tempered glass is that used for side and rear windows in automobiles, used for its characteristic of shattering into small cubes rather than large shards. Tempered glass is also used in buildings for unframed assemblies (such as frameless doors), structurally-loaded applications, and any other application that would become dangerous in the event of human impact. Toughened glass is used in some cell phones such as the Apple iPhone and LG Secret due to its scratch-resistant properties.

Rim tempered indicates a limited area such as the rim of the glass or plate is tempered and is popular in food service

Product Range


Thickness: 3mm,3.2mm, 3.5mm, 4mm,4.2mm, 4.5mm, 5mm, 6mm, 8mm,10mm,12mm,15mm,19mm
Regular Sizes:300*300, 500*700, 600*900, 1000*700, 1000*800, 1220*900, 1220*914, 1220*1000, 1830*1220, 2440*1830, 3300*2140, 3660*2140, 6000*2440, to the maximum.

we can do according to customer requirements if they can meet our MOQ (Minimum Order Quantity)

products

ARCHITECTURAL GLASS

Transparency and clarity are the distinctive characteristics

PROCESSED GLASS

The way of enhancing the safety and ability of the glass.

PATTERN / ROLLED GLASS

Decorative options to provide Style and Privacy

GLASS BLOCKS

Provide visual obscuration while admitting light.