In recent years, global sealing technology companies—names like Freudenberg, Parker Hannifin, and SKF—have been pouring billions into one of the most volatile frontiers in clean energy: hydrogen.
At first glance, it seems obvious. Hydrogen boasts an energy density three times greater than gasoline, and a staggering 100 times that of lithium batteries. It’s often hailed as the "fuel of the future." But there's a catch: the molecule itself.
Hydrogen atoms are so small, they can slip through conventional rubber seals with ease. Add extreme conditions—pressures up to 70 MPa and temperatures plunging to minus 253°C—and you have a recipe for chaos. Materials brittle. Seals fail. And that’s precisely the opportunity.
Governments around the globe are throwing unprecedented financial support behind hydrogen infrastructure. From the European Union’s Hydrogen Strategy to China’s Five-Year Plan and the United States’ Inflation Reduction Act (IRA), decarbonizing industries like transport, steelmaking, and aviation has sparked a gold rush for advanced sealing systems.
These seals are no ordinary components. Whether it's a low-permeability O-ring inside Toyota’s Mirai fuel stack, a reinforced containment system for high-pressure hydrogen tanks, or a liquid hydrogen pump operating near absolute zero—engineers are relying on innovations like fluoroelastomers and metallic bellows to keep leakage rates under a microscopic 0.01%.
And the race isn’t just technical—it’s geopolitical.
In Europe, the focus is firmly on “green hydrogen.” The EU’s goal? 40 GW of electrolyzer capacity and 10 million tonnes of green hydrogen by 2030. France’s Air Liquide is leading with advanced cryogenic technology and transport networks, while the UK’s ITM Power pioneers PEM electrolysis, partnering with Shell and Linde on mega-scale hydrogen projects.
China is fast-tracking both renewable and byproduct hydrogen. The nation’s 14th Five-Year Plan explicitly promotes hydrogen stations and fuel cell vehicles. Players like Yihuatong and Weichai Power are pushing innovation deep into commercial transport.
Across the Atlantic, the U.S. is investing heavily in “blue hydrogen”—made from natural gas with carbon capture. The Department of Energy’s National Clean Hydrogen Strategy outlines consumption targets stretching to 2050. Plug Power, a leader in hydrogen solutions for logistics giants like Amazon and Walmart, is rapidly expanding its PEM electrolyzer capacity.
Japan, meanwhile, remains in a league of its own. Toyota’s Mirai remains the world’s top-selling hydrogen car, while Kawasaki Heavy Industries has developed the world’s first liquid hydrogen transport vessel. The country’s national hydrogen strategy has recently been revised, setting even more ambitious long-term targets.
And in the Middle East? The sunlight-rich region sees hydrogen as its post-oil future. Saudi Arabia’s NEOM project aims to become a global green hydrogen hub. Oman has introduced new land laws to accelerate clean hydrogen developments, with companies like Hydrom and OQ leading the charge.
So why are all these global giants sprinting toward hydrogen?
Because without advanced sealing technology—the unseen, unglamorous barrier between safety and disaster—the hydrogen economy quite literally doesn’t hold.

How to break the sealing dilemma under harsh working conditions? In the strong acid of chemical reactions, under the high temperature and pressure of 150℃ at the bottom of oil and gas wells, and in the extremely cold environment of liquid oxygen pipelines in spacecraft, traditional rubber seals are undergoing unprecedented tests. Brittleness, swelling, cracking... Every seal failure may cause equipment worth millions to shut down, or even cause major safety accidents. What kind of guardian do these key parts with "industrial blood" need?
Rubber more expensive than gold--perfluoroether rubber
The DMHUI (Demeihui) team has gone through difficulties and introduced the sealing material-perfluoroether rubber (FFKM) into the field of industrial sealing. This "magic rubber" with a raw material cost per kilogram of gold has amazing performance parameters:

• Temperature range
The temperature resistance of perfluoroether rubber has been verified by long-term experiments, and its operating temperature covers -25℃ to 327℃. This range is determined by the molecular structure of the material: the tetrafluoroethylene (TFE) of the main chain and the perfluoromethyl vinyl ether (PMVE) of the side chain form a stable chemical bond, which can still maintain elasticity at a high temperature of 327°C. In terms of low-temperature performance, the special formula can meet the requirements of -25°C, while ordinary FFKM is usually stable above -20°C.

• Chemical resistance
According to the ASTM D471 standard test, the volume swelling rate of FFKM in 20% nitric acid (23°C/72 hours) is only 10%, while fluororubber (FKM) is 35%. This difference is due to the molecular structure of FFKM that does not contain any C-H bonds at all, and its fluorine atoms are closely arranged to form a chemical barrier, which effectively resists strong acid corrosion. For example, after the Kalrez 0040 O-ring was immersed in nitric acid at 110°C for 168 hours, the swelling rate was still controlled within 10%, verifying the stability of FFKM in extreme chemical environments.

• Economic Benefits
1. Semiconductor industry: In plasma etching equipment, the application of FFKM seals reduces equipment downtime losses by 70%. For example, after a wafer fab adopted FFKM to replace traditional FKM, the average annual downtime was reduced from 48 hours to 14 hours, and the direct maintenance cost decreased by 65%. This improvement is due to FFKM's tolerance to corrosive gases (such as NF₃, Cl₂), which avoids production line interruptions caused by frequent replacement of seals.
2. Oilfield application: In high-pressure sulfur-containing oil and gas wells, the maintenance cycle of FFKM seals is extended from 3 months to 1 year, and maintenance costs are reduced by 50%. Perfluoroether sealing products certified by Norsok M710 can withstand long-term erosion by hydrogen sulfide (H₂S) and carbon dioxide (CO₂), reduce the frequency of downhole equipment replacement, and save about US$200,000 in annual maintenance costs per well.

The value logic behind the high price
The pricing strategy of "a seal is worth a precision equipment" has shocked many customers, but we prefer to do a long-term account: When you choose a sealing solution for key equipment, have you considered:
→Production loss caused by unplanned downtime?
→ Safety risks caused by leakage of hazardous media?
→ Labor costs caused by frequent replacement of seals?
Although the initial investment of perfluoroether O-rings is high, it brings:
√ Equipment availability increased to 99.6%
√ Safety hazards reduced by more than 90%
√ Full life cycle maintenance costs reduced by 60%

As our engineers said: "In extremely harsh environments, 0.01 mm deformation may be the line of life and death. What DMHUI (Demeihui) has to do is to make every O-ring a trustworthy line of defense." Born for the ultimate, trusted by professionalism From hydraulic oil seals for agricultural machinery to sealing systems for aviation machinery, DMHUI (Demeihui) has always been practicing the promise of "how harsh the working conditions are, how reliable the seal must be". Now, we hand you the key to open the door to extreme working conditions - when traditional sealing solutions are stretched to their limits, perfluoroether O-rings will be the ultimate answer to rewrite the rules.

Associate Professor Yong Zhanfu of the School of Polymer Science and Engineering of Qingdao University of Science and Technology, with his profound attainments in the fields of polymer material fatigue life prediction, rubber mechanical simulation and software secondary development, recently visited Demeirui Mechanical Seals Factory in Julu County, Hebei Province for in-depth technical guidance. This exchange is not a simple visit, but a key action to inject strong momentum into the future development of the factory and clarify the path of technological upgrading, which significantly enhances the core competitiveness of the enterprise.
On-site diagnosis, indicating the direction of process optimization and quality improvement:
In Demeirui's production workshop, Professor Yong went deep into the front line and carefully inspected the entire process of rubber seals from raw material processing, mixing, molding to vulcanization. With a deep understanding of the relationship between the microstructure and macroscopic performance of polymer materials, he accurately pointed out the key process nodes that affect the stability and final performance of product batches. For example, for core links such as mixing uniformity and precise control of vulcanization process parameters, Professor Yong provided specific optimization solutions based on materials science. These suggestions directly target production pain points, which not only help Demeirui to immediately improve the stability and consistency of existing product quality, but more importantly, point out a clear technical roadmap for it to establish a refined production system for high-performance and long-life seals.

Process upgrade:
Professor Yong diagnosed the production process on the spot, and proposed optimization solutions based on material science for key links such as mixing and vulcanization, which significantly improved the stability and life of product quality, and pointed out the technical path for the production of high-performance seals.

R&D empowerment:
In the laboratory, he proactively guided the establishment of accelerated fatigue testing and complex working condition simulation capabilities, and emphasized the use of experimental data to correct simulation models. This lays the foundation for the factory to directly apply Professor Yong's team's advanced fatigue life prediction technology and customized simulation tools (such as UMAT secondary development) in the future, turning simulation into a research and development tool.
Clear direction:
This guidance clarifies the core direction for Demeirui - from experience manufacturing to data-driven and simulation-led precision R&D manufacturing, focusing on improving the long life and adaptability of products to complex environments.
Solid backing: Professor Yong and his team from Qingdao University of Science and Technology have become a strong technical support and knowledge source for Demeirui, ensuring that it can continue to obtain cutting-edge technical support and clarifying a high-quality development path driven by scientific and technological innovation.

Associate Professor Yong Zhanfu's guidance is like lighting a bright light for Demeirui Mechanical Seals Factory, which not only solves the current technical confusion, but more importantly, relying on the strong academic resources of Qingdao University of Science and Technology, it has planned a clear path for it to lead development with science and technology and drive the future with innovation, so that Demeirui has unique technical advantages and a clear development direction in the fierce market competition.