Product parameters

Product parameters

Our tempered vacuum glass separates the two glass pieces with a 0.2 mm high support and seals the edges of the two glass sheets with low temperature glass to remove the air. The vacuum between the glass is 10-4Pa, so the heat convection no longer exists, the heat conduction is reduced to the limit, and the LOW-E layer reflects more than 95% of the infrared radiation, so the heat between the inner and outer glass plates cannot be exchanged. Excellent thermal insulation. Tempered vacuum glass size: up to 3000x2000mm; minimum 200x200mm; thickness 6~20mm.

 Glass type Total thickness (mm) Heat transfer coefficient (K value: W/m2·K) Visible light transmittance (%)

Shading coefficient SC value

Passive room tempered vacuum glass








Tempered glass for curtain wall








Tempered glass for freezer








Steel window vacuum laminated composite glass for skylight








Customers often ask about the price/performance ratio of Longwang tempered vacuum glass. We can compare with the world’s most famous German three-glass two-chamber insulating glass. Our tempered vacuum glass is the most cost-effective window glass product in the world.

Germany’s three-glass two-chamber hollow glass contains two pieces of three-silver LOW-E glass. Both hollow layers are filled with argon and are sealed with super warm edge strips. The central heat transfer coefficient K at its best can only reach 0.7.

We use a tempered vacuum glass made of two pieces of three silver LOW-E glass, the central heat transfer coefficient has reached 0.23.

That is to say, our 8.2 mm thick tempered vacuum glass has more than three times the thermal insulation performance of the German 32 mm thick three-glass two-chamber insulating glass.

Our tempered vacuum glass has a life span of 50 years. The maximum life of the three-glass and two-chamber insulating glass in Germany is 25 years, which means that the service life is twice that of Germany.

Buying a piece of our tempered vacuum glass is worth more than 6 pieces of German three-glass two-chamber insulating glass. The minimum factory price for German products is 50 Euros per square meter, equivalent to RMB 368.8.

6×368.8=2212.8 yuan, then the value of our tempered vacuum glass has exceeded 2212.8 yuan / square meter.

What price are you willing to pay to enjoy this high-tech product?

1) Vacuum glass can be used independently, or it can be made into hollow vacuum composite glass, laminated vacuum composite glass, and solar vacuum composite glass.

2) When the window is made of vacuum glass, it is preferably designed as a casement window. Ordinary sliding windows are not easy to play the role of vacuum glass because of the tight sealing.

3) Vacuum glass should be selected according to different climatic conditions, uses and functions.

4) Vacuum glass cannot be cut, and the length and width of vacuum glass matched with different window frame materials are the same as that of insulating glass.

5) Non-tempered vacuum glass should be used vertically under normal conditions, and the tempered vacuum glass can be installed obliquely or horizontally.

6) Vacuum glass should be inspected for appearance quality before use. Do not use vacuum glass with cracks and obvious scratches. Scratching a hard object on the surface of a vacuum glass can cause damage, even if it does not fail at that time, which will greatly reduce the service life.

7) Protect the glass corner protection cap before installation. Squeeze, collision and manual disassembly are strictly prohibited.

8) The edge of the vacuum glass should not be exposed and must be installed in the window frame.

9) The vacuum glass installation position should be away from the heating and cooling equipment to avoid cold and hot air blowing directly on the glass.

10) When the vacuum glass is used, the vacuum eye is installed at the upper corner of the window.

11) When the vacuum glass is used at a temperature difference of more than 50 °C on both sides, use tempered vacuum glass.

12) During the process of handling, installing and using vacuum glass, vibration and impact should be prevented. When transporting, only vertical handling is allowed. Vacuum suction cups are forbidden. When placed on the ground, a soft rubber pad should be placed under the glass. The glass should not be in direct contact with the concrete floor to avoid corner breakage.