Tetraphenyltin is primarily used as a stabilizer in the production of polyvinyl chloride (PVC) plastics. It helps prevent degradation of PVC when exposed to heat and light, ensuring the material remains durable and long-lasting. Additionally, it serves as a catalyst in organic synthesis, particularly in reactions involving the formation of carbon-carbon bonds. In the electronics industry, it is utilized in the manufacturing of semiconductors and as a precursor for depositing tin-containing films. Its applications also extend to research laboratories, where it is employed in studies related to organometallic chemistry and material science.