Aure Chemical supplies high-purity Tetramethyltetravinylcyclotetrasiloxane (D4Vi, CAS 2554-06-5), a clear, colorless liquid. This reactive cyclic silicone monomer is crucial for synthesizing high-performance silicone rubbers (LSR, RTV), high vinyl silicone oils, and other specialty silicone materials, acting as a vital crosslinking and chain extension agent in polymerization processes.