Polyurethane
| Chemical Name: | Polyurethane – elastomer |
| Abbreviation: | PUR |
| Common/ Trade Names: | Austane®, Urethane®, Lurathane® |
| Properties: | |
| Colour | Typically colour determines the hardness however uncoloured PUR typically is creamy in colour. This is also highly dependant on the isocyonate makeup of the urethane; either TDI, MDI, NDI or PPDI.
Typical colours range from Black, red, greens, yellows and Blues to name a few. Colours will determine a hardness grade with most manufacturers |
| Form | Rod, Tube, Sheet and Special purpose castings |
| Applications: | Drive Rollers, Drive and idler wheels
Sheave linings, Piston cups and seals Gaskets, Vibration Bushings Vibration isolation Wear pads Scraper Blades, Pump liners Impellors, Conveyor rollers |
| Machining: | Can be difficult to machine. Hardnesses above 80 Duro are more readily machined; below this hardness parts are usually cast to shape or rough machined. Closer tolerances are achieved by grinding. |
| Types: | Polyester base Urethanes mostly for dyamic applications and Polyether base Urethanes for moist environments. Hardness range from 40 Duro’A’ to 75 Duro ‘D’
Cellular foam |
| Advantages: | Can be cast with low cost moulds, Good abrasion resistance, Good tear resistance, High impact resistance. Polyurethane is resilient like rubber but the abrasion resistance and load-bearing capacity is better than rubber resulting in longer life. |
| Disadvantages: | Limited operating temperature range,
Hydrolysis & Hysteresis failures |
| Chemical Resistance: | Resists water, oils, chemicals and solvents |