There are two types of Low-E glass: hard coat and soft coat. As you might imagine, they have different properties. In fact, they actually look different.In my factory, we produce the soft Low-E glass which have the better energy-saving ability.

Soft coat Low-E glass, on the other hand, involves the application of silver, zinc or tin to glass in a vacuum. The glass enters a vacuum chamber filled with an inert gas which is electrically charged. The electricity combined with the vacuum allows molecules of metal to sputter onto the glass. The coating is fairly delicate or "soft".