FAQ about vacuum glazing

Normally our posts are for glass professors ,while most end users don’t understand what’s vacuum glazing and the difference from normal double glazing,as well as the reasons why vacuum glazing is so expensive,here is a summary of FAQ about vacuum glazing for end users to understand well.

What is vacuum insulating glass?

Vacuum insulating glass,or vacuum glazing units,is new and revolutionary glass products.The aim is to meet the strict net zero laws and rules set by worldwide nations and countries.

Vacuum insulating glass,is sealed glass units contains 0.1-0.3mm high vacuum space (usually 10-4Pa) between glass panels.Different from normal double glass units,the vacuum space replaced air or argon and bring up huge performance improvement ,whether it’s thermal insulation,soundproof performance and anti-condensation performance.

Learn more:Ultimate vacuum glass guide-2022 version

vacuum glass structure-HaanGlas Glass-China manufacturer

How does vacuum glazing work?

Whether air,argon or other gas inside double glass units,the gas contribute to the heat transfer and exchange between inside and outside.

Through changing gas to vacuum, vacuum glazing eliminate the heat convection and prevent heat transfer from external lite to internal glass in summer and in winter prevent inside warm air transferred outside and keep house warm.

In addition to the low-E coating helps reflect most solar radiation and transfer the solar lighting into cold light,vacuum glazing final heat transfer performance is only 20% that of double glass units.

Vacuum glazing is the most efficient glazing till now,it makes windows &glass not only a shelter from wind and rain,but also work as a wall to reduce the energy used for heat and cooling.Many windows restoration projects has started to adopt vacuum sealed windows without changing the windows frame to expensive modern ones.

heat transfer types-conduction convection and radiation

What’s the benefit of vacuum glazing?

Vacuum glazing can not only decrease the energy consumption,make your summer cool and warm in winter.

Vacuum glazing also brings more benefits,such as make your house more quiet and decrease the noise,especially low and middle frequency traffic noise.Keep your glass free from condensation for up to 25 years.Even though initial investment is huge,the long lasting benefit worse it.

How vacuum insulated glass been sealed?

Traditionally sealing materials used in VIG sealing is glass solder,glass are permanently bonded by heating and melting the glass solder,but the high temperature used to melt glass solder will cause glass edge anneal and cause uneven strength of glass panels,and rigid bonding will decrease VIG overall bending strength.

HaanGlas used low temperature metal edge sealing technology,it won’t cause glass anneal and keep glass high strength,The metal edge sealing material can withstand greater deformation caused by temperature difference and wind load , so the vacuum glass with metal edge sealing is more reliable and better.

HaanGlas vacuum insulated glass is sealed by metals to keep high vacuum degree and long lifetime

Is vacuum glazing safe?

Despite excellent thermal and soundproof performance,safety is the biggest concern of end users.

World main VIG manufacturers can only produce annealed vacuum glass,it can be only applied in low story buildings,while high rise buildings require high strength glass to prevent impact and glass falling once broken.

Tempered vacuum glass will break into fragments after serious impact,the fragments counts in a area of 50 50mm is 65

Tempered vacuum insulating glass solved all these problem,the glass is fully tempered with 3-5 times higher strength with excellent impact resistance,even if glass broken,the fragment also prevent hurt.

Is vacuum glass flat?

Many VIG manufacturers use a cap to cover the evacuation holes after sealing the glass edge,while ,it’s necessary to drill holes on glass and affect glass strength,the cap will also fail after been installed,which has caused bad impression.

HaanGlas used creative production method,the glass is sealed in high vacuum degree condition,so the holes and end cap is not necessary ,glass lifetime is expected to reach 25 years.

What are vacuum sealed windows?

Vacuum sealed windows is windows using vacuum insulating glass.

Vacuum glass can be used in windows restoration directly without changing original windows frame and systems

Now popular windows with double glass units are quite thick and always expensive because of increased aluminium & PVC materials.Complex structures are added to make windows more energy saving,while the consequence is higher costs.

As vacuum glass is only 6-10mm thick,vacuum sealed windows can achieve same and much better performance with normal windows frame and help decreasing overall costs.

More importantly,the thin vacuum glass can fit almost any already installed windows frame,customers can replace the original glass and improve your windows performance 10 times higher directly without paying for new window systems and the long time site works.

Is vacuum glazing expensive?

Since vacuum glazing innovation 30 years ago,high vacuum glass price limited its large scale application.

The world main vacuum glass manufacturers include AGC-Fineo, Pilkington Spacia, China Landvac and HaanGlas.Generally the vacuum glazing price is USD150-250/SQM even though many of them are normal anneal vacuum glass.

The emergement of HaanGlas changed the situation and makes vacuum glazing price more friendly.Vacuum glass products varies from USD110-160/SQM based on different projects,vacuum glazed windows (U value 0.89W/M2.K，which is far more superior than passive house windows) reached USD350-500/SQM ,which is only half that of other windows manufacturers.

Large scale vacuum glass units production is available in HaanGlas

Vacuum glass supplied by HaanGlas is not only tempered to offer more safety,but also with superior metal edging sealing technology makes it the world most advanced vacuum glass products.

HaanGlas is turnkey vacuum glazing manufacturers ,we not only offer vacuum glass,but also developing vacuum sealed windows to fit your every project.