DIN SPEC 91326 – to provide railway vehicle design


“Fire retardant, multiaxial reinforced composite parts, manufactured in vacuum process technologies for railway vehicle applications”

Using examples, DIN SPEC 91326 describes various lightweight structures made of fiber-reinforced plastics – so-called FRP structures – with tested fire protection properties according to DIN EN 45545 and known mechanical properties. In addition to isotropic structures, quasi-isotropic structures of various thicknesses are described, so that an example of direct lamination is given for each application; this can then be directly adopted by the user. This makes a modular system possible, in which the appropriate components can be selected for each project. The advantages provided by vacuum infusion result in reproducible, highly integrative FRP components with a high potential for lightweight construction – now for the first time with tested fire protection properties.

In addition to the mechanical properties, such as strength values, and modules of a unidirectional individual layer that serve as a design template for new composite structures, all fiber-reinforced plastic (FRP) parameters – such as the individual layer thickness, the fiber content and the material density – are described. With this information, a complete FEM (Finite Element Method) analysis of a component can be prepared.

This standard provides designers of railway vehicles with standardized material and process parameters for lightweight FRP structures as early as during the dimensioning and design phase. In terms of materials, the requirements for complying with the new European fire standard for railway vehicles according to EN 45545 are also taken into account.

LEO Infusion Resin

LEO Protection Layer (Topcoat / Gelcoat)

Core Materials (Optional)

LEO Reinforcement Material
(Glass / Carbon / Aramid / Hybrid)