Polyvinyl chloride composition containing ferrocene smoke suppressant additives

A polyvinyl chloride plastic containing as a smoke suppression additive a dicyclopentadienyl iron compound incorporated in said plastic in chemically uncombined form and in smoke reducing effective amounts of about from 0.1 to about 1.0%, by weight, based on the polyvinyl chloride polymer content of said plastic, and wherein said dicyclopentadienyl iron compound is selected from the group consisting of dicyclopentadienyl iron, monoalkyldicyclopentadienyl iron;

• dialkyldicyclopentadienyl iron, monoalkanoyldicyclopentadienyl iron;
• dialkanoyldicyclopentadienyl iron;
• the dimer and polymer reaction products of dicyclopentadienyl iron, and alkyl substituted derivatives thereof, with aldehydes or ketones;
• and mixtures thereof, and wherein as used with respect to said dicyclopentadienyl iron compounds, the terms alkyl and alkanoyl refer to alkyl groups and alkanoyl groups having from one to eight carbon atoms.