Back-up rings have no intended sealing function. Instead, as their name indicates, they are protective and supporting elements made from extrusion-resistant materials which generally have a rectangular cross-section. They are installed in a groove together with an elastomer sealing element, preferably with a corresponding O-ring in static applications.
EV targets set to cost UK auto makers billions
The UK car ´parc´ (technical term) in 2023 was 36 million, UK car sales in 2023 just under 2 million and as the report above says 363,000 EV sales,...