How to install capillary tube on glass correctly?

Capillary tube is used in insulated glass to balance the air pressure inside and outside of insulted glass to avoid glass contract or expand after installation.

Sometimes insulated glass production area altitude is quite different from the areas to be installed.If produced in seaside while the installation area latitude is over 1000M high,or produced in high altitude areas while used in seaside.For area pressure reason, glass will expand or shrink after installation,then the capillary is recommended to help keeping glass absolute flat and avoid visual distortion.

Capillary tube is small stainless steel tube with only 1mm diameter,it’s installed on insulated glass edge(from aluminium spacer bar) and certain parts(around 50mm) is exposed outside to keep air flow inside and outside glass.

Maybe some clients have received capillary tubes like below pictures,but we have to say this capillary tube is wrong,it was installed after sealant,which will affect the glass sealing effect.

Here is the instructions to produce insulated glass with capillary tube:

A capillary tube is designed to allow air to enter or scape an IGU chamber to avoid any damage to the unit due to atmospheric pressure differences. The tube should only allow enough air to move in and out without constituting a continuous communication, that’s why it’s important to make sure we are always creating a “gooseneck” . 

The tube should be placed on one of the sides of the unit, not on the top or the bottom spacer. 

Almast always the units will be transported on its side to fit in the container. It’s important to make sure that the gooseneck with the 50 mm difference is preserved. To ensure that please tape the tip of the tube to the front of the glass in a downward position. 

Here are some insulated glass we have finished with capillary tube,or breath tube.

Morn is your turnkey insulated glass supplier,welcome contact us for more info.