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.