The containers or boxes polypropylene are structured in plastic material closed cell excellent performance in terms of strength and elastic memory, ability to absorb repeated shocks regaining its initial shape and, therefore, long life. low thermal conductivity poor water absorption plasticity and formability, high resistance to compression and dimensional stability resistance to high temperatures (120 ° C) resistance to chemical agents (solvents and oils) Resistance to environmental factors (UV-resistant) The particular nature chemistry of the raw material and production processes and make the EPP foam material far more environmentally friendly and versatile: expanding gases are not used (it is only air), the product is recyclable and, above all, can be reused several times.