Overview
Polyurethane rings are engineered sealing components made from polyurethane elastomers, valued for their exceptional mechanical properties and versatility. They are commonly used in dynamic and static sealing applications across industries such as automotive, manufacturing, and fluid power systems. These rings outperform traditional rubber seals in demanding environments due to their superior resistance to wear, compression set, and extrusion. Their ability to maintain elasticity under high pressure makes them ideal for heavy-duty applications.
Structure and Working Principle
Polyurethane rings are typically O-ring or custom-profile designs, manufactured through casting or machining. Their sealing action relies on elastic deformation to fill gaps between mating surfaces, creating a barrier against fluids or gases. Under pressure, the ring’s cross-section compresses, increasing contact stress with the housing. Polyurethane’s high tensile strength (up to 8,000 psi) prevents blowout, while its low friction coefficient (0.2–0.5) reduces energy loss in moving assemblies.
Key Features
1. **Durability**: 4–8x longer service life than nitrile rubber in abrasive environments. 2. **Temperature Range**: Performs from -40°C to 100°C (special grades up to 120°C). 3. **Chemical Resistance**: Compatible with most hydraulic oils, fuels, and solvents (excluding ketones/esters). Polyurethane’s Shore hardness options (70A–95A) allow customization for specific load requirements. Its tear strength (500–1,000 lbs/in) prevents damage during installation in tight tolerances.
Application Areas
**Hydraulic Systems**: Rod/piston seals in excavators and presses withstand 5,000+ psi pressures. **Pneumatics**: Used in air cylinders for factory automation, resisting micro-leakage. **Industrial Machinery**: Seal rotating shafts in pumps and mixers, handling abrasive slurries. Specialty applications include offshore equipment (saltwater resistance) and food processing (FDA-compliant grades). Unlike metal seals, PU rings dampen vibration and reduce noise.
Maintenance and Precautions
Inspect rings annually for cracks or flattening in high-cycle applications. Lubricate with compatible grease (e.g., PTFE-based) during installation to prevent startup wear. Avoid using in: 1) Ozone-rich environments (causes surface cracking), 2) Steam above 100°C (hydrolysis risk), and 3) Skewed gland designs (uneven compression). Store in dark, dry conditions below 30°C to prevent pre-installation degradation.
B2B Procurement Guide
Technical specifications to confirm: 1) Inner/outer diameter tolerances (±0.1–0.3mm standard), 2) Durometer hardness (e.g., 90A for dynamic seals), 3) Color coding (black for general use; colored for identification). Bulk orders (500+ units) typically reduce costs by 15–30%. For custom profiles, provide CAD drawings with radii callouts. Leading manufacturers include Parker Hannifin, Trelleborg, and local Asian suppliers with ISO 9001 certification.
Related Manufacturers
- 主营：大口径胶管、吸引胶管、耐高温胶管、耐磨胶管、夹布胶管、高压胶管、耐磨喷砂胶管、耐酸碱胶管、空压机胶管、钢丝骨架胶管、吸排水胶管、输油软管、大口径吸排胶管、金属软管、耐高温蒸汽胶管、橡胶软接头、挤压胶管、水冷电缆胶管、编线胶管、尼龙树脂管、尼龙制品、陶瓷胶管
- 主营：硅橡胶垫片、丁腈橡胶垫片、石墨碳纤维轴套
- 主营：泛塞封、液压缸密封件、微小泛塞封、密封圈、大规格密封圈、高压密封圈、弹簧蓄能密封圈、油缸密封圈、耐高压密封圈、高转速旋转密封圈、耐高温密封圈、耐低温密封圈、定制O型圈、格莱圈、密封圈生产厂家、泛塞密封圈、定制密封件、车削密封、密封件、密封件厂家、端面密封、导向环、导向带
- 主营：聚氨酯梅花垫、柱销弹性垫、联轴器缓冲垫、六角梅花垫
- 主营：聚氨酯柱销联轴器、联轴器
- 主营：聚氨酯包胶、聚氨酯v型轮
- 主营：密封管、靠车板、lbh油封、格莱圈、密封圈、聚氨酯、挡泥板、淘金锅、密封垫、牛皮碗、洗猪机、油缸轴、ydd油封、密封件、uhs油封、旋转轴、上下密、对轮垫、压缩机o、四氟泛塞、液压油封、加布油封、联轴器八、充气密封、复合垫片
- 主营：联轴器、梅花联轴器、鼓形齿式联轴器、聚氨酯缓冲联轴节、膜片联轴器、链条联轴器、凸缘联轴器、星型联轴器、弹性联轴器、十字滑块联轴器、轮胎联轴器、鞍型块联轴器、夹壳联轴器、齿式联轴器、带制动鼓形齿式联轴器、弹性套柱销联轴器、滑块联轴器
- 主营：聚氨酯制品各种异形件加工制作
- 主营：聚氨酯圈、高压胶管、金属软管
- 主营：减震垫块、橡胶垫块、橡胶异形件、聚氨酯产品、聚氨酯异形件、注塑尼龙、注塑ABS、注塑异形件
- 主营：机械密封件、橡胶夹布膜片、橡胶密封件
- 主营：橡塑制品、硅胶制品、高低压胶管及总成、聚氨酯减震圈、接头、橡胶止水带
- 主营：耐高压、kskttosog、nbr高温、密封圈、橡胶圈、fkmo型圈、nbro型圈、圈o型圈、进口O型圈、nbr耐磨、硅橡胶、乙丙epdm、三唇油封、液压油封、四氟垫片、六角螺丝、唇形油封、全氟橡胶、旋转油封、防水防尘、防尘耐磨、硅胶氟胶、氟胶油封、高温高压、四氟油封
- 主营：nbr油封、ttosognak、tto骨架、密封圈、nok氟胶、nsk轴承、轴承座、ina轴承、润滑油、skf油封、润滑脂、nok油封、cfw油封、fag轴承、密封件、skf轴承、斯凯孚、丁腈油封、骨架密封、绝缘轴承、油缸密封、油封骨架、高温油封、专用密封、skf耐高压
- 主营：O型密封圈、骨架油封