Ray-ban and most other manufacturers frames are made from Plastic compounds. Ray-ban used to make all its glasses out of 'glass'. Now it makes its sunglass products out of scratch resistent plastics. Often they will 'feel' like glass but are in fact most usually plastic production.
Helium. Properties. Gaseous chemical element, symbol: He, atomic number: 2 and atomic weight 4,0026 g/mol. Helium is one of the noble gases of group O in the periodic table. Itâs the second lightest element. The main helium source in the world is a series of fields of natural gas in the United States. Helium is a colourless, odourless, insipid and non-toxic gas. Itâs less soluble in water than any other gas. Itâs the less reactive element and doesnât essentially form chemical compounds. The density and viscosity of helium vapour are very low. The termic conductivity and the caloric content are exceptionally high.
Properties of fluorine Fluorine, a yellow gas (18), is the most electronegative and the most reactive chemical element. It reacts with nearly all organic and inorganic materials, even with gold and platinum. Hydrogen and fluorine react with explosive violence.