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The extra clear glass is a type of float glass, which has very low iron content and hence is also called low iron glass. The iron content in float glass is usually 830 – 850 ppm (parts per million), while iron content in an extra clear glass is less than 150 ppm. It allows almost 92% of visible light to be transmitted. An extra clear glass is a colourless transparent glass and provides very clear view.

Low iron glass is not produced by processing a float glass, but instead raw materials which are free from iron impurity or have negligible iron content are used. Silica sand which has low iron content is mixed with other raw materials and melted in a furnace to produce molten glass. This molten glass is then cooled in similar way like float glass, to produce extra clear glass as a final product.

  • Extra clear glass offers clear view without distortion of colours. It shows the true colour of an object.

  • Due to low iron content, its reflective property is decrease and thus it allows maximum sunlight to pass through it. This helps in eliminating the unnecessary need of using artificial lights.

  • Along with light transmission, it also provides more heat gain as compared to float glass, which can be beneficial in countries, which have low or sub-zero temperatures throughout the year or for more time of the year.

  • It can be further processed to produce tempered glass, laminated glass, insulated glass units, frosted glass, and ceramic printed glass, just like a float glass.

  • Due to high clarity in vision, it increases the aesthetics of the structure.

  • An extra clear glass is extensively used in applications where edges of the glass are visible such as shower frames, table tops, office desks, shop counters, etc.

  • It is used in interior applications, where clear vision is desired such as doors, windows, glass partitions, wall cladding, handrails, balustrades, stairs, etc.

  • As it displays true colours, low iron glass is more preferred for making back painted glass (BPG) and ceramic printed glass rather than float glass.

  • It is used in solar panels, photovoltaic cells, medical equipments, etc. as it allows transmission of UV rays.

  • The extra clear glass is used in commercial applications such as showrooms of jewellery items, watches, crystal ware items, fine fabrics and art ware items, glass elevators, aquariums, museums, art galleries, etc.

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