The UN oil seal series is commonly used in hydraulic systems and features a U-cup style design. These seals are typically made from high-performance elastomers such as NBR (Nitrile Butadiene Rubber) and PU (Polyurethane).
NBR offers excellent resistance to oil, fuel, and many hydraulic fluids, making it suitable for medium-pressure applications.
PU, on the other hand, provides superior wear resistance, high elasticity, and better performance in dynamic sealing, especially under higher pressure and speed.
The UN series includes variants like UHS and UNS, which differ in lip geometry and pressure handling. These seals are often reinforced with back-up rings or anti-extrusion devices for enhanced durability. UN oil seals are widely used in hydraulic cylinders for industrial machinery, construction equipment, and agricultural systems.
Composition and Variants: UHS and UNS
· UHS (UN Hydraulic Seal – Symmetrical Type): UHS seals are symmetric in design, allowing for bi-directional sealing. They are typically made from high-performance polyurethane or nitrile rubber (NBR) and are ideal for standard hydraulic cylinders, offering excellent resistance to pressure, extrusion, and wear.
· UNS (UN Hydraulic Seal – Single Lip Type): UNS seals feature an asymmetric profile, designed mainly for rod sealing. They are constructed for optimized performance under higher friction conditions and are often combined with support rings or backup rings to improve stability under pressure spikes.
These two models cover a wide range of operating needs in hydraulic systems. Whether in linear actuators, machine tools, or industrial presses, UHS and UNS seals are integral in ensuring fluid retention, contaminant exclusion, and mechanical efficiency.
Tailored for Demanding Environments
The DEDE brand has built a reputation for delivering advanced sealing technology that serves industries where precision and endurance are critical. The UN Oil Seal Series has found broad utility in:
· Hydraulic and pneumatic cylinders
· Heavy-duty industrial machinery
· Construction and mining equipment
· Injection molding machines
· Agricultural and forestry equipment
· Material handling systems
· Energy equipment (wind turbines, gas compression systems)
· Marine and shipboard hydraulic systems
These seals operate reliably under dynamic mechanical stress, frequent pressure changes, and harsh working conditions, proving essential in reducing oil leakage, minimizing downtime, and extending service intervals.
DEDE is Engineering Services and Manufacturing Capabilities
DEDE is not just a product supplier, but a full-scale sealing system partner. The company delivers:
· Rapid dispatch of standard components: Over 10,000 sizes of O-rings, oil seals, and other seals are ready in stock, enabling fast delivery to meet emergency needs in global industrial chains.
· Custom-engineered solutions: From material selection and geometric design to in-house prototyping and testing, DEDE offers complete customization to match the operating parameters of non-standard equipment.
· Performance-driven consulting: With over 30 years of industry experience, DEDE supports clients in seal performance optimization, maintenance reduction, and system life extension through material upgrades and precision fitment.
Company Highlights That Reinforce Trust
DEDE is credibility is rooted in its status as:
· Real-sector intelligent manufacturing enterprise
· Industry-recognized leader in sealing technology
· Company with full model availability and stock
· Exporter to over 80 countries worldwide
· Brand acknowledged by global OEMs and industrial users
· Provincial-level technical innovation center
· Certified "Specialized and Innovative Enterprise"
· High-tech enterprise driving innovation in sealing materials and methods
· Flagship member of its local industrial cluster
These credentials underscore DEDE's consistent contribution to sealing innovation and manufacturing excellence.
Meeting the Needs of Modern Industries
Because the UN series (UHS and UNS) is mainly used in hydraulic systems, it is widely applied in industries that rely on precise pressure control and fluid motion. Suitable industries include:
· Energy and power generation
· Automation and robotics
· Metallurgy and rolling mills
· Aerospace ground support equipment
· Rail transportation
· Agriculture and food processing machinery
· Marine hydraulic systems
· Construction equipment (excavators, loaders, dumpers)
The UN Oil Seal Series—centered on UHS and UNS variants—reflects the
evolution of sealing technology in modern hydraulic engineering. Backed by DEDE
is extensive expertise, advanced production capabilities, and commitment to
tailored service, these seals contribute to reducing operational risk while
supporting long-term equipment stability. As industries worldwide continue to
push the limits of mechanical performance, robust sealing solutions like DEDE is
UN series remain an essential part of the equation.
