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Improve Leaking 850 bar Hydrogen Compressor with 20KD


Issue – KwangShin has developed hydrogen filling station compressors for automobiles that use hydrogen gas. The required pressure of the hydrogen filling station is 700 bar. But KwangShin gradually increased the pressure from 700 to 850 bar g. They used the 700 bar g O-ring for the first time. However, the O-ring did not withstand 700 bar g and burst.

Goal – They looked for a special O-ring to last 700 bar g, which is inaccessible.

Products featured in this case study:

Chesterton 20KD Face & Static Seal – O-ring upgrade for static sealing.

Chesterton 20KD face and static seal


The Chesterton specialist advised using Chesterton 20KDRFS combined with premium material AWC860.

Operating conditions:

  • Equipment: Hydrogen compressor
  • Fluid: Hydrogen Gas
  • Pressure: 850 bar g
  • Temperature: 150 -180 °C
  • Seal size:
    • 20KDRFS AWC 860 254.00 x 261.00 x 2.95 mm
    • 20KDRFS AWC 860 241.50 x 248.50 x 2.95 mm

Hydrogen filling station compressor

Hydrogen filling station compressor

Chesterton 20KD Static Seal in compressor

Chesterton 20KD Static Seal in compressor

Chesterton 20KD Face & Static Seal – ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​compression seal for use in static applications and as an upgrade on conventional face seals or O-ring designs.

Features and benefits:

  • Upgrade performance of conventional face seal and O-ring designs
  • Superior wear extrusion and resistance versus conventional methods
  • Low compression set characteristics
  • Unique manufacturing process allows the flexibility to create any size
  • Sizes made to accommodate international standards, including ISO and DIN


No issues have been recorded using Chesterton 20KDRFS Static Seal, for over 1,000 hours. The customer, therefore, decided to change to all Chesterton 20KDRFS Static Seal instead of using O-rings.

Product price$180$220
Replacement cycle50 hours1,000 hours
Labour cost on replacement$375 x 20 times = $7,500$375 x 1 time = $375
Production lossNANA
Total cost (1,000 hours)$180 + $7,500 = $7,810$220 + $375 = $595
Total savings$7,215 (over 12 times more cost-effective)

All amounts in USD. 

About Us

Chesterton® is a world leader in helping process industry companies and manufacturers improve the reliability and efficiency of their rotating, stationary, and fluid power equipment platforms. We are known across a wide range of industries for our award-winning pump and valve sealing solutions, applications expertise, equipment maintenance and wear-prevention products, and knowledgeable hands-on local service. Chesterton product range includes mechanical seals, packing and gaskets, industrial lubricants and coatings.

® Registered trademark owned by A.W. Chesterton Company

Issued 08/2022. APAC0043 – Korea.

Technical data reflects results of laboratory tests and is intended to indicate general characteristics only. A.W. Chesterton Company disclaims all warranties expressed or implied, including warranties of merchantability and fitness for a particular purpose. Liability, if any, is limited to product replacement only. Any images contained herein are for general illustrative or aesthetic purposes only and are not intended to convey any instructional, safety, handling, or usage information or advice respecting any product or equipment. Please refer to relevant Safety Data Sheets, Product Data Sheets, and/or Product Labels for safe use, storage, handling, and disposal of products, or consult with your local Chesterton sales representative.

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