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POLYPROPYLENE (PP) BALLS
Polypropylene balls are featured by a low weight, good mechanical characteristics and corrosion, fatigue and collisions resistance. They are resisting to heat and excellent electric insulators. They are floating into water. Additives can be added to avoid degradation phenomena causing to a long exposure at sun light (UV radiation absorption). It is a recyclable material.
Applications
Low load bearings, special valves, check valves, flotage valves, fluid level indicators, carburetors, flow meters, chemical, medical and laboratory devices, blood transfusion kits.
Technical name | Commercial name | Abbreviation | Molecular formula |
Poly(propene) | Polypropylene | PP | (C3H6)n |
Physical / Mechanical / Thermal / Electric / Magnetic Properties
Property | Symbol | U.o.M. | Type | Notes | Value |
Density | δ | g/cm3 | Physical | Room temp. | 0.87 |
Young's modulus | E | GPa | Mechanical | - | 1285 |
Friction coefficient | µ | - | Mechanical | Room temp. | 0.30 |
Water absorption | Aw | % | Physical | 24h | 0.10 |
Coefficient of linear thermal expansion | α | 10-6/ºC | Thermal | (ΔT=0-100°C) | 135.0 |
Thermal conductivity | λ | W/(m·K) | Thermal | Room temp. | 0.19 |
Electric resistivity | ρ | Ω*m*10-9 | Electric | - | > 1014 |
Relative magnetic permeability | µ | - | Magnetic | Diamagnetic | <1 |
Technical Data
Property | Type | U.o.M. | Values | U.o.M. | Values |
Hardness | Mechanical | Shore D | 70-80 | - | - |
Ultimate compressive strength | Mechanical | MPa | 40-50 | psi*103 | 5.8-7.3 |
Service temperature | Thermal | ºC | -30/110 | ºF | -22/230 |
Range
Diameters | U.o.M. | Diameters | U.o.M. | Precision Grade |
2.381 - 350.000 | mm | 3/32 - 14 | inch | 0 - I - II - III |
Corrosion Resistance
Polypropylene balls are resisting into not concentrated acids, alkalis, alcohols, oils, greases and most inorganic compounds. Fair resistance in aromatic hydrocarbons, Polypropylene plastic balls are not resistant in contact with halogens. They provide corrosive phenomena even in presence of concentrated acids and oxidizing agents at high temperature.