How much do you know about tempered glass for doors and windows?
Release date:
2025-09-01
1. How can you tell the difference between tempered glass and ordinary glass?
1 Look for the glass sign
Check if the edges and corners of the glass have the 3C certification mark for tempered glass—glass with the indelible 3C marking (the kind that can’t be scraped off) is almost always tempered. The manufacturing process for tempered glass begins by cutting standard float glass into the desired dimensions, followed by edge grinding and cleaning. Next, a mandatory national CCC certification mark is applied using ink. Once the glass has been heat-treated in the tempering furnace to become a finished product, it can no longer be cut or further processed. And typically, after exposure to high temperatures, the ink becomes permanently embedded, making it impossible to remove.
If the 3C mark on your glass can easily be wiped off with your hand, it’s highly likely that the glass isn’t actually tempered—and is probably fake.
2 Check for minor deformations
Does the glass appear slightly warped when viewed from the side? After being fired at high temperatures, glass can develop subtle deformations—though these are usually too minor to notice on the surface. The distortion becomes visible only when examining the glass from its side, as the front typically remains smooth and unaltered.
3. Look at the glass shards
Ordinary glass, when broken, shatters into large, sharp-edged pieces that can easily cause injury. In contrast, tempered glass breaks into small, granular fragments with blunt edges, making it much less likely to harm someone.
Second, tempered glass classified by shape: flat tempered glass and curved tempered glass.
Generally, the more commonly used thicknesses for flat tempered glass are 4.5, 6, 8, 10, 12, 15, and 19 mm—eight options in total. For curved tempered glass, the most common thicknesses are 5, 6, 8, and 10 mm—four options in all.
Third, tempered glass classified by process: physical tempering and chemical tempering.
Physical tempered glass is produced by subjecting ordinary flat glass or float glass to a specific processing method—either quenching or air-cooled quenching—under controlled conditions. Chemical tempered glass, on the other hand, is created by altering the molecular structure of the glass surface through an ion-exchange process, which introduces a layer of compressive stress on the glass surface.
Four, Characteristics of Tempered Glass
1 High impact resistance
Four to five times stronger than ordinary glass; boasts high flexural strength—up to five times greater than standard flat glass—and excellent thermal stability, capable of withstanding temperature differences of up to 200°C. It also features a smooth, transparent surface and cannot be easily cut.
When subjected to extreme impact, the resulting fragments break into small, evenly dispersed particles without sharp edges or corners, which is why it’s also referred to as safety glass.
2. The tempered thickness will become slightly thinner.
The reason for the thinning is that after the glass is heated and softened, it undergoes rapid cooling caused by strong winds. This process compresses the internal crystal gaps within the glass, increasing the internal pressure. As a result, the glass becomes thinner after tempering compared to its original thickness. Typically, 4–6 mm glass sheets become 0.2–0.8 mm thinner after tempering, while 8–19 mm glass can lose 0.9–1.8 mm in thickness during the same process. The exact degree of thinning, however, depends on the specific equipment used.
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Contact Address: No. 7, Industrial Avenue East, Songxia Industrial Park, Shishan Town, Nanhai District, Foshan City
Warren Doors and Windows, south of Fangshan Road and west of Dongtai Road, Dongcheng Subdistrict, Linqu County, Weifang City, Shandong Province
Become A Deaters :Info@wolunmc.com
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