Low-E Insulating Glass (Low-E IGU) Limitations

The silver-ion metallic film deposited on the surface of Low-E glass is exceptionally vulnerable. Exposure to atmospheric moisture, oxygen, or other airborne contaminants triggers a chemical reaction that can lead to discolouration, blackening, or even complete detachment (peeling) of the coating.

Low-E Insulating Glass Units (IGUs) contain air or an inert gas (e.g., argon) in the cavity. Air continuously oxidises and degrades the Low-E coating, causing its performance to decline until it eventually discolours and fails progressively. 

Argon gas itself is prone to leakage, and once it leaks, the thermal insulation performance of traditional Insulating Glass Units (IGUs) decreases. Because the IGU contains a desiccant, the cavity can remain free of moisture and remain dry for a short period. The sealants used for IGUs are often organic adhesives, such as polysulfide, silicone, and butyl rubber, which generally have poor weather resistance. After prolonged use, these adhesives exhibit ageing, which allows moisture to enter the insulating cavity. This ultimately leads to the desiccant becoming saturated and failing, resulting in the gradual loss of Low-E glass performance. The typical service life of IGUs is generally less than 10 years.

Crucially, the Low-E coating within the IGU cavity only mitigates radiant heat transfer. It offers no defence against heat loss via gas convection and conduction.

LandVac Titanium Vacuum Glass Advantages

In contrast, LandVac Vacuum Insulating Glass (VIG) utilises a flexible metallic seal, and the internal support pillars are also made of low-conductivity metallic material. This construction offers excellent resistance to ageing, and the cavity is maintained in a vacuum state, which guarantees the stability and longevity of the Low-E glass performance. The expected service life of LandVac vacuum glass is over 25 years.