Standards for Selecting Tempered Glass

Tempered glass is actually quite common in our daily lives. It comes in two main types: flat tempered glass and curved tempered glass. It is used for architectural glass doors and windows, partition walls, glass curtain walls, as well as automotive and marine doors and windows.

2022-08-20

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　　I. Curvature
　　The curvature of tempered flat glass shall not exceed 0.5% for bow-shaped deformation and 0.3% for wave-shaped deformation.
　　II. Impact Resistance
　　Six tempered glass samples shall be tested. If the number of damaged samples does not exceed one, the batch is deemed合格 (qualified). If three or more samples are damaged, the batch is deemed 不合格 (unqualified). If two samples are damaged, an additional six samples shall be tested; if all six of these new samples are不合格 (unqualified), the batch is deemed 不合格 (unqualified).
　　III. Fragmented State
　　Four tempered glass samples shall be selected for testing. Within a 50 mm × 50 mm area, each sample must contain more than 40 pieces; a small number of elongated pieces is permitted, provided their length does not exceed 75 mm, their ends are not knife‑shaped, and the angle between the elongated piece and the glass edge does not exceed 45°.
　　IV. Impact Performance of Bullet Packages
　　Four flat tempered glass specimens shall be tested, and the specimens must meet one of the following requirements (1) or (2).
　　(1) When the glass is broken, the total mass of every set of 10 test specimens shall not exceed the mass equivalent to a specimen area of 65 m².
　　(2) When the bag is dropped from a height of 1200 mm, the sample remains undamaged.
　　V. Bending Measurement
　　Take flat tempered glass products as an example. The specimen shall be placed vertically, and a ruler shall be positioned horizontally near the specimen’s surface for measurement. The bow is expressed as the percentage of the ratio of the arc height to the chord length. In wave‑shaped profiles, it is indicated as either the ratio of the height between a trough and a crest, or the percentage of the distance between two adjacent troughs.
　　Tempered glass can withstand temperatures up to 380°C. It is classified as safety glass. In essence, tempered glass is a type of prestressed glass. To enhance its strength, compressive stress is induced on the glass surface through chemical or physical processes. When external forces are applied, this surface stress first counteracts the load, thereby increasing the glass’s load-bearing capacity and improving its resistance to wind pressure, thermal shock, and impact.

Keywords:

Tempered glass,Tablet,Curved surface,Glass doors and windows

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