Overview
Low hardness polyether polyurethane is a specialized elastomer that combines the mechanical properties of polyurethane with enhanced flexibility. This material is engineered to provide superior shock absorption and vibration damping while maintaining durability. The polyether-based formulation offers better hydrolysis resistance compared to polyester polyurethanes, making it suitable for applications involving moisture exposure. Polyether polyurethanes are synthesized through the reaction of polyether polyols with diisocyanates, resulting in a polymer with excellent low-temperature flexibility and dynamic properties. The low hardness variants are particularly valued in applications requiring soft yet tough materials that can withstand repeated deformation without permanent set.
Physical and Chemical Properties
The defining characteristic of low hardness polyether polyurethane is its Shore A hardness, typically ranging from 30A to 70A. This softness provides exceptional elasticity with elongation at break values often exceeding 400%. The material exhibits good tear strength (30-50 kN/m) and compression set resistance, maintaining its shape after prolonged loading. Chemically, polyether polyurethanes demonstrate excellent resistance to water, fungi, and microbial attack, outperforming polyester-based polyurethanes in humid environments. They show moderate resistance to oils and hydrocarbons but may swell in strong solvents. The material maintains flexibility across a wide temperature range (-40°C to +80°C), with some formulations extending this range further.
Main Applications
In industrial settings, low hardness polyether polyurethane is extensively used for vibration isolation mounts and shock absorbers in machinery. Its ability to dampen vibrations while resisting environmental degradation makes it ideal for outdoor equipment and marine applications. The material is also popular in conveyor systems as soft rollers that reduce noise and protect delicate transported items. The medical field utilizes this material for prosthetic components and orthopedic devices where soft-touch interfaces are required. In consumer products, it appears in high-end sports equipment grips, ergonomic handles, and protective cases that combine impact absorption with durability. Automotive applications include soft bushings and suspension components that require long-term performance under dynamic loads.
Safety and Storage
While fully cured polyether polyurethane is generally considered safe for most applications, proper handling precautions should be observed. Uncured components (polyols and isocyanates) require proper ventilation and personal protective equipment during manufacturing. Machining operations may generate dust that should be controlled through local exhaust ventilation. Storage of raw materials should be in sealed containers below 30°C, protected from moisture and direct sunlight. Finished products have good shelf stability but should be kept away from strong oxidizers and concentrated acids. Disposal should follow local regulations for polymer materials, with recycling being preferred where possible.
B2B Procurement Guide
When sourcing low hardness polyether polyurethane, buyers should clearly specify the required hardness range (Shore A scale), as even small variations significantly affect performance. Key mechanical properties to define include tensile strength, elongation at break, and compression set values. Environmental factors such as expected temperature range and exposure to chemicals or UV radiation should be communicated to suppliers. For custom formulations, lead times may extend to 4-6 weeks for compounding and testing. Minimum order quantities typically start at 100 kg for standard grades, with price breaks at tonnage levels. Quality certifications to request include ISO 9001 and material-specific test reports (e.g., ASTM D412 for mechanical properties). Consider suppliers with in-house compounding capabilities for tailored solutions.
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