ISO 18955:2025

This international standard applies to suspension diaphragms designed to be fitted on railway vehicles and similar vehicles running on dedicated tracks with permanent guide systems, whatever the type of rail and the running surface. This international standard does not detail other components of pneumatic suspension assemblies or control systems such as air reservoirs, frames, stiffeners, emergency suspension systems or elastic supports (such as series springs), etc., which will affect the diaphragm performance. The international standard specifies terms and definitions,symbols and abbreviated terms, conditions of use, definition of the product, inspection and test methods, marking, definition documents, traceability, qualification and quality surveillance, inspection and quality surveillance.