Oil-resistant Polyurethane
Overview
Oil-resistant polyurethane is a specialized elastomer formulation designed to maintain its physical properties when exposed to various oils and lubricants. This material represents an important category of polyurethane chemistry where the polymer backbone is modified to resist swelling and degradation from hydrocarbon exposure. Unlike standard polyurethanes, oil-resistant formulations incorporate specific chemical groups that reduce the material's affinity for oil molecules. This makes them particularly valuable in automotive, aerospace, and industrial applications where contact with lubricants or fuels is inevitable.
Physical and Chemical Properties
Oil-resistant polyurethane exhibits a unique combination of mechanical durability and chemical stability. Typical Shore hardness ranges from 60A to 90A, with tensile strength between 20-50 MPa depending on formulation. The material maintains these properties even after prolonged oil immersion. Chemically, these polyurethanes show minimal swelling (typically <10% volume increase) when exposed to ASTM #3 oil at elevated temperatures. They also demonstrate excellent hydrolytic stability and resistance to oxidation, which contributes to their long service life in harsh environments.
Main Applications
The primary use of oil-resistant polyurethane is in dynamic sealing applications where conventional rubbers would degrade. This includes hydraulic cylinder seals, fuel system components, and power transmission belts in oil-lubricated environments. In industrial settings, oil-resistant PU is widely used for protective coatings on equipment exposed to lubricants. The material's abrasion resistance makes it ideal for oil-resistant conveyor belts and rollers in manufacturing plants. Emerging applications include 3D printing materials for oil-resistant prototypes and functional parts.
Safety and Storage
While cured oil-resistant polyurethane is generally safe, uncured components may contain isocyanates that require proper handling. Always use appropriate PPE when machining or processing the material to prevent inhalation of particles. Storage conditions should maintain temperatures between 15-30°C with relative humidity below 65%. Raw materials in liquid form (prepolymers) require nitrogen blanketing to prevent moisture absorption. Shelf life typically ranges from 6-12 months when stored properly in sealed containers.
B2B Procurement Guide
When sourcing oil-resistant polyurethane, clearly specify your requirements including: oil type (mineral, synthetic, fuel), temperature range, dynamic/static application, and regulatory compliance needs (e.g., FDA, REACH). Quality indicators include certified test reports for ASTM D471 (oil resistance), D2240 (hardness), and D412 (tensile properties). For large-volume purchases, consider requesting material samples for application testing before finalizing orders. Lead times typically range from 2-6 weeks depending on formulation complexity.
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