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8 Advantages and 2 Disadvantages of low E Glass

It is thought that between 10-50% of a given home’s energy loss occurs through its windows and doors, and that 90% of the energy lost through windows is lost through the glass itself. This is an undeniably hefty chunk of energy to be losing through such a small area of your house’s architecture. In 1975, the first low-emissivity glazing solution was brought to market in a bid to change this.Get more news about Low-e Glass Manufacturers,you can vist our website!

The emissivity of a surface refers to the amount of energy it emits at specific wavelengths, with thermal energy usually being the focus. A material is given a numerical thermal emissivity value of between 0 and 1, with a perfect reflector having an emissivity of 0 and the perfect absorber having an emissivity of 1.

Metals, such as Silver and Aluminium, have thermal emissivities of <0.05, while standard clear glass comes in at around 0.9, making it one of the higher emissivity materials out there. Breaking this down, standard glass with its thermal emissivity of 0.9, allows 90% of thermal energy to pass through it, reflecting the remaining 10%. Clearly then, window glass needs some help in reflecting heat back into the home. This is where low E glass comes in. Low E glass is essentially standard clear glass with a microscopic, transparent coating on its surface that is better at reflecting heat than the glass itself, creating a composition that has a lower emissivity than standard glass. Glass with a low E coating therefore keeps your home warmer by reflecting a higher proportion of the heat back into your home, and can keep you cooler by reflecting solar thermal energy from outside. This coating can either be “soft-coat” – applied to glass off-line in a vacuum chamber at room temperature and sealed within an IGU, or “hard-coat” – which is fused to the surface of the glass while it’s being produced. For the purposes of this piece, we’ll be focusing on soft-coat, as it is of lower-emissivity, and more commonly used in the UK market.