What is 3D Cover Glass-What you should to know about 3D hot bending

 > What is 3D Cover Glass

With the development of technology, everyone is no longer satisfied with straight lines. More complex bends and curves will make the product more aesthetic and technological, and all 3D cover glass came into being. 3D cover glass is a three-dimensional shaped glass, suitable for handheld devices, instruments, various electronic devices with displays, watches, bracelets, music boxes and other smart wearable touch and tempering of household appliances and industrial equipment in the 5G field Glass panel.

3D cover glass

The influence of glass substrate on 3D cover glass

3D cover glass is processed using glass substrate, so the glass substrate has a great influence on 3D cover glass. Using high-quality and high-strength glass substrates can significantly improve product yield and performance. In addition to the well-known Corning, there are also many excellent products:

3D cover glass

Imported brands of cover glass: Corning from the United States, Asahi Glass from Japan, and Denki Glass from Japan

Chinese cover glass brands: Sichuan Xuhong, CSG, Kibin Group, CNBM

The performance of the best products from Chinese glass manufacturers such as CSG KK6 and Xuhong Panda 1681 has reached the performance comparison with common glass substrates of Corning GG5 and GG6.

Performance comparison of common glass substrates
Corning CG6Reinforcement depth 750-850Surface stress value CS≥750-850
Electric Glass T2XReinforcement Depth 40Surface stress value CS≥750-940
Asahi GlassReinforcement depth DOL≥8Surface stress value CS≥450
China XuhongReinforcement depth DOL≥35Surface stress value CS≥650

There are two key factors in the molding and manufacturing of 3D cover glass: a high-performance 3D hot bending machine and a graphite hot bending mold.

Impact of graphite hot bending mold on 3D hot bending

There are two key factors in the molding and manufacturing of 3D cover glass: a high-performance 3D hot bending machine and a graphite hot bending mold.

1. Select static pressure graphite materials with a density higher than 1.82g/cm3, a particle size less than 4u, uniform particles, and a tight structure. The expansion coefficient of graphite material is required to be as close as possible to the thermal expansion coefficient of glass, which helps in the size control of 3D cover glass products.

3D hot bending mold
hot bending mold

2. The mold structure design should be designed according to the appearance shapes of different glass products and the changing characteristics of 3D cover glass molding.

3. The processing quality of graphite molds is crucial to the yield of 3D cover glass. To improve the glass yield and reduce glass polishing time, high-precision machine tools are required for price. The contour accuracy after graphite mold processing is required to be 0.01mm. Within, the flatness is within 0.005mm, and the mold surface is smooth without obvious knife marks.

The impact of 3D hot bending machine on 3D cover glass

A high-performance 3D hot bending machine is very important for 3D cover glass. Fengxiao Technology participated in the design and development of this hot bending machine, making the effect of this hot bending machine even better. The parameters of the hot bending machine we use as follows,

3D hot bending machine
3D hot bending machine capabilities
Hot bending glass thickness range 0.4-4.0 mm
Hot bending glass size range 1800*800
Hot bending mold size range2000*1000
Product hot bending cycle30-420 seconds
3D hot bending glass productsConsumer electronics 3D cover glass
, automotive 3D cover lens, instrument
 3D cover glass
heating methodHigh frequency heating
Stable production quantity >20000PCS

3D cover glass production process

The process of 3D hot bending includes: CNC cutting, glass substrate cleaning, 3D hot bending process, double-sided glass polishing after hot bending, chemical strengthening after hot bending, pad printing or electroplating, lamination and other engineering processes

3D hot bending process

1. CNC glass substrate cutting: For glass material cutting, the glass substrate is CNC cut into rough blanks. CNC finely carved glass uses the grinding wheel groove of the precision engraving machine to grind the rough glass and remove the excess; and the glass raw material is chamfered and drilled through a drill bit.

 2. Glass substrate cleaning: Remove glass dust, particles, or oily dirt, etc., without making it foggy.

3.  3D hot bending process: The glass substrate with finely carved shapes and holes is placed in the graphite mold, and then the mold is placed in the hot bending machine. After preheating, pressing, and cooling, the glass is formed into curved glass in the mold .

4. Double-sided polishing of 3D cover glass: After the 3D cover glass is hot-bent, the surface of the product must be polished. A cashmere wheel is used to finely polish the surface of the glass product.

5. Chemical strengthening of 3D cover glass: Mixing high-purity potassium nitrate solution and matching catalyst, usually 4-6 hours of high-temperature tempering treatment at 450°C, to improve the glass’s anti-scratch and impact resistance.

6. 3D cover glass pad printing or electroplating: transfer ink or electroplating to the designated area of ​​the 3D cover.

7. 3D cover glass lamination: This process is to laminate the touch film to the glass cover.


The development of 3D cover glass provides more room for imagination for product definition. While retaining aesthetics and enabling interactive touch operations, Fengxiao Technology’s 3D cover glass is known for its high quality, competitive prices and on-time delivery. We are willing to accept challenging projects and achieve more impossibilities.

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