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• The letters are part of an internal code which refers to the composition of the layer.
• The first number indicates the base product: (1) PLANILUX, (2) PARSOL Bronze, (3) PARSOL Grey, (4) PARSOL Green, (5) PINK.
• The last two figures correspond to the transmission of light when the base product is a colourless glass. In the case of PARSOL and PINK the light transmission is lower than these two figures.
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