Cast iron with vermicular graphite (CGI) is an iron/carbon material, the carbon part of which occurs mainly as graphite in flake form. Its characteristics are high static stability together with a still good workability, similar to cast iron with lamellar (scaled) graphite.
Datasheet about CGI issued by the VDG (German Association of Foundry Specialists)
In the qualities:
EN CGI 300 to 500 (also for thin-walled casts)