The Benefits of Tempered Vacuum Glazing


Vacuum glazing is an innovative fenestration product with multiple advantages for modern building industries. Its unique structure features two fully tempered glass substrates separated by a 0.3 mm vacuum space maintained with micropillars and advanced technology. The best guide to finding vacuum glass cost.

Though sometimes perceived as anomalies, subtle distortions may actually be positive characteristics that mirror historic glassware. Read on to gain more knowledge of tempered vacuum glazing.

Thermal Insulation

Vacuum glazing provides superior thermal insulation over traditional double-glass units. By blocking three forms of heat transfer (radiation, convection, and condensation), it reduces energy loss while improving building efficiency and providing excellent acoustic performance without thicker and heavier panes of glass.

LandVac tempered vacuum glazing consists of multiple pieces of toughened glass separated by tempered support and sealed with alloy material. Then, they are evacuated to create an effective vacuum chamber between them. This new generation of glazing boasts superior thermal insulation and sound abatement capabilities, as well as higher levels of safety and bending resistance than its predecessors.

Notably, vacuum glazing features minor visual distortions and exterior condensation as an inherent characteristic. These effects do not result from poor installation or manufacturing and, in fact, serve as a testament to its superior thermal efficiency. Exterior condensation occurs when air from inside cannot penetrate the outer glass to warm it; when this moisture settles on its surface, it evaporates away when the glass cools, leaving behind visible clear patterns on the outside surface that customers frequently consider positive features of vacuum glazing.

Vacuum glazing’s insulating properties are further enhanced through its use of frit-coated glass on both sides, further increasing its insulating capabilities. Due to its unique composition, this type of frit glass features a very low coefficient of transmittance that results in a U-value that falls well below building regulations’ minimum requirements and significantly less than traditional double-glazed glasses.

Vacuum glazing’s structural integrity is further strengthened by the addition of a stainless steel pillar as a spacer between glass sheets. This helps maintain vacuum pressure between panes while decreasing water ingress into cavities.

An analytical mechanical model of vacuum glazing was constructed and evaluated using ANSYS. The effect of different vacancies of support pillars on surface stress and deformation was examined, leading to the conclusion that continuous vacant support pillars (CVSP) in multi-pane vacuum glazing systems can result in higher surface stress, which may easily lead to the formation of glass defects, compromising reliability and durability of such systems.

Noise Reduction

Vacuum glass boasts a lower U-value than double or triple glazing and is capable of mitigating both heat transfer and noise transmission. This is mainly due to the absence of air between glass panes, which creates an effective insulating barrier without increasing thickness or weight. This makes vacuum glazing an ideal choice for modern buildings, passive houses, heritage window restoration projects, or retrofit projects.

Vacuum-glazed units differ from traditional double and triple-insulated glass in that their spacer bars do not detract from their appearance. This provides single-glazed window aesthetics that are ideal for listed buildings and conservation areas that aim to retain historic aesthetics. This can make vacuum-glazed units especially important.

LandVac vacuum-glazed units feature 4mm toughened safety glass bonded to a lead-free alloy frame containing a vacuum cavity for improved thermal and acoustic insulation performance and isolation. This innovation represents a significant advancement in vacuum glazing technology, allowing us to provide more excellent thermal and acoustic isolation capabilities.

This unique design utilizes proprietary technology to combine the safety benefits of tempered glass with those of a vacuum cavity. A fully tempered glass substrate is placed at the center of a vacuum chamber and coated with low-emissivity paint to reduce radiant heat loss, and a stainless steel ball array replaces cylindrical support pillars to reduce contact area and energy loss. Furthermore, the edge seal of an FTVG has also been significantly enhanced using Cerasolzer CS186’s excellent weather resistance and longer service life than standard gaskets.

CESUN’s patented vacuum glazing boasts an incredibly stable structure that is free from dew condensation, capable of withstanding atmospheric pressure and abrasion, and helps ensure optimal performance even in harsh environments. Furthermore, using the vacuum between glass panes prevents noble gas escape and eliminates the need for gas filling while simultaneously decreasing glass unit size, improving structural integrity, and improving safety performance.


Vacuum glazing offers superior safety and durability compared to traditional glass and superior resistance to impact. This makes it suitable for high-rise buildings, airports, and public areas; additionally, it serves as a sound barrier that reduces noise from traffic sources, construction works, and neighbors.

Vacuum glazing works on the principle of creating an atmospheric pressure differential between two panes of glass. To accomplish this task, an array of micro-spacers called support pillars must be utilized. These evenly spaced micro-spacers resist atmospheric pressure while keeping an equal gap between both panes, allowing light through yet maintaining excellent thermal insulation properties.

vacuum glazing provides superior energy efficiency regardless of its mounting position. This is due to the absence of gas molecules between panes that prevent heat transfer and maintain a constant gap. Furthermore, vacuum glazing also has the added advantage of reducing condensation risk.

Tempered vacuum glazing also has the added advantage of having a lower spontaneous breakage ratio compared to other forms of glass. This means it is less likely to shatter on impact, minimizing injuries caused by cutting or piercing. Furthermore, using more advanced and stronger substrate materials may make this type of glazing even safer.

LandGlass has overcome difficulties to create Enhance, an innovative product that successfully marries toughened glass safety with vacuum cavity performance benefits while using 10 times fewer support pillars than similar products on the market.

Timber windows created from this process seamlessly blend traditional charm with cutting-edge technology, offering the ideal solution for conservation and listed properties by increasing energy efficiency while simultaneously protecting the character and architectural integrity of historic homes.


Though vacuum glazing typically incurs a higher initial cost, its durability, and energy-saving capabilities often make it more economical than other windows. Vacuum glazing’s resistance to impact, pressure changes, and temperature fluctuations is greater than that of traditional windows, as it lasts up to 25 years without needing replacement or repair. Thus, tempered vacuum glazing is an investment with long-term returns.

While critics of vacuum glazing often point out the higher thermal conductivity of edge seals compared to central panes, this factor has minimal bearing on window performance overall. Furthermore, solutions like LandVac(tm) Enhance hybrid VIG allow for reduced edge seal thermal conductivity by forgoing evacuation ports in favor of using warm-edge Swisspacer bars instead.

Vacuum glazing compares favorably in terms of durability to other glass facade systems, such as double-glazed windows and insulating aluminum frames, yet its lifespan tends to outlive these products due to fewer moving parts and permanent bonding with air gaps between solid pieces of toughened glass bonded permanently together – creating an extremely sturdy structure.

A vacuum glazing system created with tempered vacuum glass seals uses low-emissivity glass that reduces radiant heat transfer for greater thermal efficiency and stainless steel support pillars designed to minimise contact with glazing surfaces.

Vacuum cavity windows do not expand with altitude changes, making installation possible across the country and making uniform facades more straightforward, especially those found in listed or conservation areas.

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