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Pyrolitic or vacuum coated glass?
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Coated glass, such as reflective, low-e, self cleaning, etc., is produced by two different processes: Pyrolitic also known as on-line process and vacuum or off-line process.
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 As the name already suggests, the on-line process consists of applying the coating during the glass production. The coating is fused into the glass while it is still hot in the annealing lehr. The basic advantage of this process is durability. There are no special handling limitations, therefore the product can be treated as a normal sheet of glass. This glass is ready to be cut, heat strengthened and toughened. Due to its characteristics, it is also known as hard coated glass and the process as hard coating. In the off-line or vacuum process, metal oxide particles are deposited on the cold glass surface by a chain reaction in a vacuum vessel. It is often called 'soft coating', because the coating is more susceptible to damage than in hard coated glass. Due to its fragility, this soft coated glass has some special handling and processing requirements. However, with some exceptions, vacuum coated products have better shading co-efficient values than pyrolytic products. Find further information about both processes on the selected links.
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Photos: 3M.com
Last review: September, 2002 |
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