KEY TO MATERIALS

LD.PE - Low Density Polyetylene

Thermoplastic resin obtained by the polymerization of ethylene .

Density between 0,915 e 0,930 g/cm3 depending on types.

Melting point 113°C. Brittle temperature -80°C aprox. Particulary suitable for flexible or semirigid itemssuch as films, hoses, bottles, hollow items and moulded articles such as container, toys or household goods. The operating temperature are between -60 and + 70°C.

Above this temperature the materials enters the softening phase, and the load-bearing capacity may be insufficient for some items, its most important qualities are its high impact strength and flexibility.

HD.PE - High Density Polyetylene

Thermoplastic resin obteined by the polymerization of ethylene.

Compared to L.D.PE. this polymer has a more linear (less branched) structure.

This is the reason for its higer density, between 0,945 and0,965 g/cm3 depending on types. The resistance to heat.

The meltin temperature about 120°C and the operating temperature of articles are generally between -40 and +90°C. The main application are for blow-moulded containers, house hold goods, boxes, pipes, and items in general where the higher load-bearing capacity than the low density material is a priority.

PP. - Polypropylene

Thermoplastic resin obtained by the polynerization of propylene. Density 0,910 g/cm3. Melting point 130°C approx. (depending on types). The operating temperature are about 0+120°C for the homopolymer and about -10, +100°C for the copolymer. The foundamental characteristics are high rigidy and hardness, with mechanical characteristicsof goods strenght for the copolymer and good resistance to high temperature (copolymer). Ideal for injection moulded and blow-moulded items (household goods and bottles respectively) with high quality appearance and good geometrical precision. Also has considerable impact strenght if oriented, and is therefore widely used for extruded products ( monofilaments, ropes, straps,etc....).