PP 5 TRIANGPP Food Container

The density of PP is between 0.895 and 0.92 g/cm³. Therefore, PP is the commodity plastic with the lowest density. With lower density, moldings parts with lower weight and more parts of a certain mass of plastic can be produced. Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as acrylonitrile butadiene styrene (ABS). Polypropylene is reasonably economical. PP has good resistance to fatigue.

Thermal properties
The melting point of polypropylene occurs at a range, so a melting point is determined by finding the highest temperature of a differential scanning calorimetry chart. Perfectly isotactic PP has a melting point of 171 °C (340 °F). Commercial isotactic PP has a melting point that ranges from 160 to 166 °C (320 to 331 °F), depending on atactic material and crystallinity. Syndiotactic PP with a crystallinity of 30% has a melting point of 130 °C (266 °F). Below 0°C, PP becomes brittle. The thermal expansion of polypropylene is very large, but somewhat less than that of polyethylene.

Applications Buckets, bowls, crates, toys, medical components, fibres for carpets and sports clothing. Rigid packaging includes a multitude of packaging applications from caps and closures to pallets and crates.It can also be produced in sheet form, widely used for the production of stationery folders, packaging, and storage boxes. The wide color range, durability, low cost, and resistance to dirt make it ideal as a protective cover for papers and other materials. The availability of sheet polypropylene has provided an opportunity for the use of the material by designers. The light-weight, durable, and colorful thermoforming plastic sheet and film makes an ideal medium for the creation of light shades, and a number of designs have been developed using interlocking sections to create elaborate designs. Polypropylene Rope is similar in strength to polyester rope but cheaper.

Polypropylene Data

General PropertiesTest MethodsUnitsValues
Melt Flow IndexISO 1133g/10 min0.8
Tensile Strength at YieldISO 527-2MPa24
Elongation at YieldISO 527-2%13
Tensile ModulusISO 527-2MPa1200
Flexural ModulusISO 178MPa1100
Izod Impact Strength (notched)ISO 180KJ/m²
At 23˚C>50
At (-20)˚C6
Charpy Impact Strength (notched)ISO 179KJ/m²
At 23˚C>50
At (-20)˚C6
Hardness Rockwell - R-ScaleISO 239-274
Melting PointISO 3146˚C165
Vicat Softening PointISO 306˚C
50N-50˚C per hour70
10N-50˚C per hour148
Heat Deflection TemperatureISO 752˚C
1.80 MPa - 120˚C per hour50
0.45 MPa - 120˚C per hour88
DensityISO 1183g/cm³0.902
Bulk DensityISO 1183g/cm³0.525