| http://www.w3.org/ns/prov#value | - According to one variant of the above two processes, which is particularly advantageous when the melting is performed in a combustion furnace (and with or without supply of electricity), the precursor glass (used as starting material or resulting from the melting of a mineral load) has an optical transmission, for any wavelength between 1000 and 2500 nm, of greater than 60%, for a thickness of 3 m
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