Tin stabilisers for PVC compounds are characterised by a central tin atom, surrounded by alkyl and acidic groups. Mixtures of mono and dialkyl tin salts are used and commercial tin heat stabilisers typically vary the ratio, depending on the performance and property requirements of the final product.

Liquid tin stabilizers, primarily methyl tin mercaptides or octyl tin compounds, are essential additives for PVC, providing superior thermal stability, high transparency, and excellent processability. These clear to light-yellow liquids prevent PVC decomposition during heat processing and are vital for producing rigid, clear applications like pipes, profiles, and films.