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Hangzhou Reach Building Co.,Ltd offers high-performance Vacuum Insulated Glass (VIG), a cutting-edge glazing solution with a vacuum layer between two panes. Featuring lead-free Ti-alloy edge sealing, tempered safety glass, and a 40m+ continuous vacuumizing process, it delivers exceptional thermal insulation (U-value: 0.44-0.50W/m²K), sound reduction (40dB), and energy efficiency. Suitable for residential, commercial, heritage projects, and refrigeration, it supports customization beyond the max size of 1200mm x 1800mm.
| Thickness | 8mm to 19mm |
| Thermal Transmittance | 0.44-0.50W/m²K |
| Visible Light Transmission (VLT) | 46%-79% |
| Solar Heat Gain Coefficient (SHGC) | 0.27-0.57 |
| Shading Coefficient (SC) | 0.31-0.66 |
| Light-to-solar Gain (LSG) | 1.39-1.79 |
| Weighted Sound Reduction Index (dB) | 40 |
| Maximum Size | 1200mm x 1800mm (Custom sizes available) |
| Delivery time | 14days |
The vacuum insulated glass uses a flexible, lead-free titanium-alloy edge-sealing system. Its plasticity and toughness help accommodate stress generated during the sealing process, supporting the bending strength, wind-load resistance, and long-term stability of the glass.
Titanium alloy also offers a high strength-to-weight ratio and relatively low thermal conductivity, helping reduce heat transfer around the glass edge while maintaining structural integrity.
A controlled vacuuming process is used to remove residual gases from the cavity between the glass panes. Exhaust temperature and negative pressure are managed along a vacuum production line measuring more than 40 metres.
After approximately two hours of evacuation, the vacuum level is checked through in-line monitoring and off-line measurement. Each qualified panel is inspected to confirm that the specified vacuum condition has been achieved.
Tempered safety glass can be used as the primary glass substrate for improved strength and impact resistance. The flexible edge-sealing system and post-sealing stress-control process help reduce additional stress around the perimeter of the panel.
This construction supports the bending strength, wind-pressure resistance, and overall safety performance required for windows, façades, and other architectural glazing applications.
Windows and doors for superior insulation and energy savings.
Suitable for retrofitting older homes without compromising aesthetics.
Curtain walls and facades for energy-efficient building designs.
Reduces heating and cooling loads in large buildings.
Ideal for museums, libraries, and healthcare facilities where thermal stability and noise reduction are critical.
Ultra-thin profile makes it suitable for upgrading older windows without altering their appearance.
Refrigeration and display cases for retail and food industries.
Skylights and greenhouses for optimized thermal performance.

Hangzhou Reach Building Co.,Ltd offers all-round support for its Vacuum Insulated Glass (VIG). It provides customization to meet specific project needs, with download access to relevant resources. A detailed FAQ addresses common questions like heat preservation vs insulation. Free samples are available on request. With over 20 years in building materials, it delivers tailored technical solutions fitting local traits, budgets, aesthetics and quality. Clients can get timely assistance via phone (+86-178-1653-4003), email or WhatsApp.
glass nominal thickness(mm) | front and back clearance(a/mm) | insert depth (b/mm) | edge clearance (c/mm) | |
sealant | Seal Tape | |||
8~12 | 5 | 3.5 | 10 | 5 |
12-19 | 5 | 4 | 12 | 8 |
w (groove width)=a (front clearance) +t (glass nominal thickness)+a (back clearance)
h (groove depth)=c (edge clearance) +b (insert depth)
Q: What is the difference between heat preservation and insulation?
A: Heat preservation and insulation are two concepts. Insulation performance indicates the ability to prevent heat transfer from the indoor high temperature to the outdoor low temperature side in winter, mainly through the vacuum between the glass and the hollow layer. Thermal insulation performance indicates the ability to block solar radiation heat in the summer, mainly through the configuration of Low-E coated glass to achieve. Therefore, when selecting glass, it is necessary to take into account two performance indicators of thermal insulation and thermal insulation, that is, the solar heat gain coefficient g value and the heat transfer coefficient U value.
Note: g value: (solar heat gain coefficient), the smaller the value, the better the heat insulation performance in summer.
U value: (thermal conductivity coefficient), the unit is W/m2·K, the lower the U value, the better the insulation performance.
Q: Can Vacuum Insulated Glass be customized in size?
A: Yes. The standard maximum size is 1200mm x 1800mm, and custom sizes are available to meet specific project needs (e.g., heritage retrofitting or special facades).
Q: How long is the delivery time for VIG orders?
A: The standard delivery time for qualified VIG products is 14 days, after strict processes like 2-hour exhaust, online vacuum detection, and offline measurement.
Q: What safety features does your VIG have?
A: It uses tempered safety glass and FLAS flexible lead-free Ti-alloy sealing. Stress balance control eliminates edge stress, enhancing bending strength, wind pressure resistance, and overall safety vs. similar products.