Polyurethane
Polyurethanes are manufactured by mixing polyols and isocyanates along with additives and curing agents. By adjusting formulations, its finished hardness can be altered from being very soft to quite hard and rigid. The mixture is then poured into moulds or onto flat plates if sheets are to be made. The material is then heat cured to solidify and reach its final properties.
Polyurethanes are widely used in Industrial and Engineering applications due to their unique properties. Choosing the specific grade of hardness depends on the application. Soft grades such as 40 to 50 Shore A are quite flexible, allowing good cushioning, impact resistance and noise dampening. Medium grades 70 to 80 Shore A are a balance between flexibility and rigidity. Red coloured 90 Shore A is the most common and has been the Industry standard for decades.
Material properties of Polyurethane
- Exceptionally durable and impact resistant
- Highly resistant to abrasion
- Resistant to Oils, Solvents and many chemicals
- Able to operate in a wide range of temperatures
- Available in different hardnesses and food grades
- High load bearing capacity in compression
Applications for the use of Polyurethane
- Gaskets and Seals for high pressure applications
- Wheels in conveyor systems
- Coating of Industrial rollers and shafts
- Hydraulic and Pneumatic seals
- Screens in the mining industry
- Custom made parts using simple moulds
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