Different window glass types
At its most basic level, all glass is made by heating sand until it melts and turns into a liquid. By changing the ingredients or process, or adding different coatings, the colour, strength and other properties of the finished glass can be altered, making it useful for a range of situations.
Most window glass is made using the float glass process. A sheet of molten glass is ‘floated’ on a bed of molten metal to create glass that is smooth and flat with a uniform thickness. The colour of glass can change depending on the mix of raw materials used. Low iron content, for instance, will produce extra-clear glass.
This guide introduces the most common types of glass used in windows and doors in New Zealand.