BITUMEN - is product of black color with a density of about one,
with a low thermal and electrical conductivity. It perfectly
resists various chemicals, water, and gas-tight, resistant to
different types of radiation and prolonged heat impact action. It
is such a valuable quality of bitumen combined with low cost and
mass production have made them indispensable in many areas of the
economy. Being amorphous material, bitumen has melting point.
