PVC undergoes rapid dehydrochlorination between 160°C and 210°C, releasing HCl and forming conjugated polyene sequences that cause discoloration and mechanical property loss. Among available stabilizer systems, methyl tin mercaptide remains the top choice for engineers running high-clarity sheets, films, and heavily filled profiles.

Methyl tin stabilizers counteract degradation through a dual mechanism: they neutralize corrosive HCl, and their sulfur-containing ligands replace labile chlorine atoms in the PVC chain with more stable linkages. This delivers unmatched transparency, early color retention, and long-term heat stability.

Unistars XY-728 is our flagship methyl tin stabilizer, offering the industry’s best transparency and initial coloring performance. For PVC film applications, XT-188 provides exclusive-process lubricity and rheology specifically tuned for heat-shrink and printing films. Contact us for free samples.