Raw materials: Glass

Working optical and related elements. Single optical elements also on order for use in many fields.
Acid-resistant, chemically-resistant, elastic, rigid, transparent, opaque, translucent, fragile, hard, ductile, high and low melting, absorbent, chemically inert, heat-resistant, economical, light, heavy, colourless, coloured, photoelectric, fìltering, monochromatic, photochromic, insulating, chrome absorbent, conductor, homogeneous, heterogeneous, with and without thermal dilation, selective, radiating or absorbing radiation, pressure-resistant, pull resistant, shiny, satin finished, smooth, rough, imporous, porous, laser effect, colour separator, high and low refraction, antinewton, antiphantom, incombustible, versatile, irreplaceable.
The Laboratorio Ottico Fiorentino is able to make colour filters using paste which have colour properties meeting customer specifications.
Advantages of using of optical elements and spherical, parabolic or square mirrors in heat-resistant glass or special optical glass for illuminated signals.
Special glass raw material, which is not subjected to significant deformations or thermal dilations during use, is more reliable during operation and provides, at the same time, greater resistance to  polluting agents in the atmosphere (being chemically resistant), which is especially important in the vicinity of big stations or large cities.
For economical reasons, in the past, an attempt was made to construct mirrors, lenses, Fresnell lenses and various optical elements in other materials - arriving even at using plastic - with results that were not exactly satisfactory, not to say dangerous.
Today, the advent of special glass with low dilation properties and a higher resistance than the metals confirms the greater merits of glass over every other type of solution. We list below some of its fundamental properties.
Greater reflective factor, almost zero deformation, higher quality of radiation reflected, greater possibility of carrying out processing in a vacuum given the material’s transparency, absence of porosity, greater internal and surface hardness of glass, scratch-resistant surface, insulation of glass with consequent reduction in electrical and  magnetic interference, greater lifetimes of glass reflectors and other components used in the interactions (light bulbs, filters, lenses, supports etc), no sliding between support (inert) and the reflective layer on top, removal of harmful infrared and ultraviolet radiation.