What is the definition of "CAST IRON JL 1040"?

Basically the numbers refer to higher hardness and generally better qualities. Everything you want to know is here:a href="http://www.claasguss.de/html_e/pdf/THBl1_engl.pdf" rel="nofollow"http://www.claasguss.de/html_e/pdf/THBl1…/a