UN 1408 Ferrosilicon, silicon < 25 % UN Rec. 23rd rev. ed. (Shortinfo)

This substance is not subject to these Regulations when it contains less than 30% or not less than 90% silicon.

If the chemical or physical properties of a substance covered by this description are such that when tested it does not meet the established defining criteria for the class or division listed in column (3), or any other class or division, it is not subject to these Regulations.