Safety and Innovation: O-Rings Hydrogen-Proof
Hydrogen (H2) is at the forefront of a revolution that could transform the mobility, energy, and industrial sectors. However, managing it requires special attention, particularly in the selection of materials used, to ensure operational safety and efficiency.
Hydrogen Compatibility and Risks
Due to its physical properties, hydrogen poses unique challenges to the materials it contacts. As a colorless, odorless, and highly flammable gas, safety management is of utmost importance. Specifically, seals need to be made from materials with low hydrogen permeability to minimize the risks of leakage and volatilization.
The compatibility of elastomeric materials with hydrogen can be compromised by several mechanisms:
- Explosive Decompression: During rapid depressurization, the pressure difference can damage the elastomeric material, leading hydrogen to destroy its structure.
- Shrinkage: Hydrogen effusion from elastomeric materials can cause O-rings to shrink, causing a loss of seal tightness, resulting in a risk of gas leakage.
- Swelling: Hydrogen absorbed in the elastomeric material can cause swelling of the section and may be extruded out of its housing or damaged by the edge of the housing.
When working with hydrogen, four key factors influence the safety and performance of a system, including its seals:
- Hydrogen Leakage
- Hydrogen Flow Velocity due to its low density
- Thermal Capacity
- Resistance to Extreme Temperatures and Pressures
For these reasons, it is essential to produce O-rings that are highly compatible with hydrogen, capable of ensuring functionality and performance throughout the expected lifespan and under all operating conditions. Leakage and permeation must be carefully managed, as they represent significant safety risks.
Oringone's Solutions
To support sectors that require highly resistant and high-performing O-rings in contact with hydrogen, Oringone has developed a range of specific compounds:
- FKM 75 Black (Z079)
- FKM 70 Blue (Z228)
- EPDM 70 Black Perox FDA (Z534)
- FKM 90 black PLT ED (Z667)
These compounds have been tested and certified to ensure optimal safety, resistance, and performance when in contact with hydrogen. Learn more here at the materials page.
