Carboxy silicone oils are modified polysiloxanes featuring carboxylic acid groups grafted onto side chains or terminal positions. These groups impart polarity, reactivity, and metal affinity, enabling coupling, lubrication, and anti-corrosion functions. They serve as lubricating anti-rust additives for metalworking fluids, structure control agents in silicone rubber, hydrophilic softeners for textile finishing, and surface modifiers for inorganic fillers to improve dispersion and compatibility in resin systems. SUNOIT supplies carboxy silicone oils with varying carboxyl values and viscosities, supported by consistent high purity and flexible supply, helping customers achieve differentiated product performance in metal protection, textile finishing, and composite materials.