To improve the durability of articles of opal glass spontaneous the naf

摘要

P the invention relates to a process for the treatment of articles made of opal glass spontaneous the naf in order to improve their durability screw - to - screw of the attack of their surfaces with water. / p & & p & this process consists in placing the article in contact with a medium for the extraction of nao comprising water, at a temperature of about 50 has 100c, for a time sufficient to deplete of nao the surface layer, but insufficient to dispose of all the nad extractable. / p & & p & uitilisation in the manufacture of articles of dishes. / p