Elastomer seals for hydrogen

Elastomer seals for hydrogen

Mobility, energy management and industry - hydrogen offers enormous potential as a climate-friendly energy carrier. Worldwide, experts from science and industry are researching at full speed in the field of hydrogen technology and its practical application. As an experienced seal manufacturer, C. Otto Gehrckens has already developed customer-specific solutions for H2 applications in various demanding projects.
and is now expanding its portfolio to include elastomer seals for this future technology.

To this end, COG is launching the new H2 Seal range of sealing materials and presenting two high-performance materials - a blue FKM and a blue EPDM compound that have been specially designed for applications with hydrogen. Both materials are the result of intensive development work at COG and have proven their optimal suitability for use in hydrogen technology in external tests of hydrogen permeability (gas permeability) by an independent laboratory.

Since the colourless and odourless gas H2 is extremely flammable and the production of molecular hydrogen is complicated and expensive, volatilisation must be avoided at all costs for both safety and cost reasons. The focus of the complex test series is therefore on measuring the hydrogen permeability by means of a pressure rise method based on DIN 53380.

The FKM material Vi 208 developed by the COG experts with a hardness of 80 Shore A impresses in the test with a very good hydrogen permeation coefficient of only 281 Ncm3 mm m-2 day-1 bar-1 on average and thus exhibits an H2 tightness that is far above what can normally be expected for FKM compounds. High chemical resistance and a wide application temperature range from -10 to +200 °C round off the material profile of Vi 208.

The new EPDM development AP 208 also performed very convincingly in the H2 permeation test - for an EPDM (hydrogen permeation coefficient: 1317 Ncm3 mm m-2 day-1 bar-1) and, with a compression set of <15% and a possible application temperature of up to -45 °C, offers a wide range of possible applications in the various sectors.

With the two H2 Seal compounds, COG provides developers and users of hydrogen technologies with two versatile special materials for challenging sealing solutions in this demanding application environment.