Made of polypropylene, these balls have a light weight and excellent mechanical properties, offering increased resistance to corrosion, shock and fatigue. They are ideal when efficient electrical insulation is needed while floating in water. Additives, such as anti-UV agents, can be incorporated to prolong their durability in sunny environments. As a recyclable material, they represent an ecological choice. Note that the color of the balls may vary over time.
Physical characteristics of polypropylene ball (pp)
| Ownership | Value | Unit |
|---|---|---|
| Density | 0.87 | g/cm3 |
| Young Module | 1425 | MPa |
| Thermal expansion coefficient | 135 (T=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 0.19 | W/m·K |
| Volume resistivity | >10^14 | D·m |
| Relative magnetic permeability | <~1 | — |
| Magnetic behaviour | Diamagnetic | — |
| Friction coefficient | 0.3 | — |
| Absorption of moisture (24 h) | 0.01 | % |
Hardness and mechanical resistance of polypropylene ball (pp)
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 70-80 | Shore D |
| Exercise temperatures | -30/110 | ° C |
| Exercise temperatures | -22/230 | °F |
Available diameters and grades for polypropylene ball (pp)
| Parameter | Value |
|---|---|
| Minimum diameter | 1.5 mm — 1/16′′′ |
| Maximum diameter | 160 mm — 6.5/16′′ |
| Grades available | 0-I-II-III-IV-V |
Corrosion resistance of polypropylene ball (pp)
They are resistant to non-concentrated acids, alkalis, alcohols, oils, fats and most inorganic components. Low resistance in aromatic hydrocarbons, they do not withstand contact with halogens. Even in the presence of concentrated acids and oxidizing agents at high temperatures, corrosion phenomena appear.
Applications of polypropylene ball (pp)
Low load bearings, special valves, non-return and floating valves, fluid level indicators, carburettors, flow meters, chemical, medical and laboratory devices, blood transfusion kits.
