Hengshui Minai Rubber & Plastic Technology Co., Ltd. is one of the leading manufacturers and suppliers of pu rubber seal in China. We are committed to providing high quality customized service and OEM/ODM service to global clients. Please feel free to wholesale bulk durable pu rubber seal made in China here from our factory. If you have any enquiry about pricelist, please feel free to email us.
Products Description
This series of PU rubber seals is finely made of high-density polyurethane material with regular roundness, smooth pore-free and burr-free surface, high dimensional accuracy and stable sealing performance. The material features a dense molecular structure, strong elastic toughness and ultra-low compression set. Different from ordinary NBR and EPDM rubber, it has outstanding resistance to wear, tear and burst. It performs excellently against hydraulic oil, lubricating oil and fuel, suitable for long-term operation in various oil media. It also has good anti-aging, anti-oxidation and hydrolysis resistance, avoiding powder falling, cracking, relaxation and failure caused by high-pressure extrusion and high-frequency friction. It adapts to dynamic reciprocating motion, rotary motion and static high-pressure sealing scenarios, widely used in oil cylinders, air cylinders, hydraulic pumps, valve groups, automation equipment and engineering machinery with lasting sealing performance, strong pressure resistance and longer service life than conventional rubber seals.
Product Advantages
Super Wear Resistance for High-frequency Movement
PU material has excellent self-lubricating and wear-resistant properties with an ultra-low friction coefficient. It is not easy to wear, generate powder or scratch the cylinder wall during high-frequency reciprocating and continuous sliding, perfectly solving the problem of fast wear and failure of ordinary rubber rings under long-term friction, and greatly reducing equipment failure rate and replacement frequency.
High Pressure & Extrusion Resistance
Polyurethane features high hardness, sufficient toughness and high tear strength, which can withstand long-term high-pressure hydraulic impact without edge extrusion, edge biting, deformation or burst. It maintains extremely stable dimensions under high-pressure and heavy-load conditions, avoiding extrusion relaxation and permanent deformation common to ordinary rubber rings, and greatly improving sealing stability.
Outstanding Oil Resistance for Oil Circuit Working Conditions
It has strong compatibility with oil media such as hydraulic oil, engine oil, lubricating oil and diesel oil. It will not expand, shrink, swell or suffer corrosion and aging after long-term immersion, maintaining stable sealing performance all the time, making it the preferred sealing accessory for various hydraulic oil circuit equipment.
Low Deformation & Lasting Sealing
The product has low permanent compression deformation and rapid & uniform stress rebound. It keeps tight fitting without gap leakage under pressure fluctuation and frequent start-stop conditions, and is not prone to fatigue failure after long-term use. Its sealing service life is several times that of ordinary rubber rings.
Hydrolysis & Aging Resistance & Strong Environmental Adaptability
High-quality PU material has strong hydrolysis resistance, oxidation resistance and weather resistance, adapting to oil-water mixing, humidity and variable normal temperature working conditions. It is not easy to harden, crack or pulverize, and can be used stably for a long time in indoor industrial working conditions.
Product Applications
1. Core Application Scenarios
Polyurethane rubber sealing rings are mainly applied in high-pressure, wear-resistant, oil circuit and high-frequency motion working conditions. Designed for heavy-duty hydraulic and pneumatic industrial equipment, they solve common defects of ordinary rubber seals such as poor wear resistance, easy damage under high pressure and swelling in oil media, serving as core sealing parts for heavy-load hydraulic systems.
2. Construction Machinery Industry
Widely used in excavators, loaders, forklifts, hydraulic cylinders and lifting equipment. They are applied for high-pressure dynamic sealing of pistons and piston rods, resisting long-term heavy-load impact and high-pressure reciprocating movement to maintain stable sealing performance.
3. Hydraulic and Pneumatic Industry
Suitable for air cylinders, hydraulic cylinders, hydraulic valves, booster pumps and complete hydraulic systems. They adapt to dynamic sealing requirements under high-frequency reciprocating and high-pressure fluid conditions, resisting hydraulic oil corrosion and deformation to ensure stable system pressure and zero leakage.
4. Automation Equipment Industry
Applicable to high-frequency moving sliding tables, pneumatic components and precision transmission mechanisms of automation equipment. With excellent wear resistance, they reduce friction loss and avoid sealing wear, loosening and failure caused by long-term high-frequency operation.
5. General Mechanical Equipment Industry
Ideal for leakage prevention of oil pressure equipment, injection molding machines, stamping equipment and fluid control equipment. Resistant to oil swelling and abrasion in long-term fluid and oil circuit working conditions, they have a longer service life and effectively improve the overall stability of mechanical equipment.
Product Q&A
Q: What is the difference between PU rubber seals and ordinary rubber seals?
A: The core differences lie in wear resistance, pressure resistance and oil resistance. PU seals feature high hardness, great toughness and strong tear resistance, specially designed for high-frequency friction, high-pressure hydraulic and oil media working conditions. Their wear-resistant service life is 3-5 times that of ordinary rubber seals, with no easy wear, crack or swell. Ordinary rubber seals are soft and suitable for low-pressure, static and general waterproof scenarios, unable to withstand high-frequency wear and high-pressure impact, and easy to fail in hydraulic oil circuit equipment.
Q: Are PU rubber seals suitable for high-pressure hydraulic equipment?
A: Absolutely suitable. PU material has excellent extrusion resistance, burst resistance and deformation resistance, which can stably withstand long-term high-pressure hydraulic impact without edge extrusion, deformation, pressure relief and leakage common to ordinary rubber seals. It performs stably in high-pressure equipment such as oil cylinders, hydraulic pumps and heavy-load valve groups, and is a standard sealing part for high-pressure hydraulic systems.
Q: Will PU rubber seals be corroded and swollen by hydraulic oil?
A: No. The special polyurethane formula has excellent tolerance to hydraulic oil, engine oil and lubricating oil. It will not absorb water or oil, swell, soften or fail after long-term immersion. Its size and hardness remain stable without enlarged sealing gaps, maintaining zero-leakage sealing for a long time and adapting to various industrial oil circuit systems.
