Phosphorous Trichloride / Phosphorus Trichloride (PCl₃) Rubber O-Rings & Gasket Compatibility

Phosphorous trichloride, designated by the chemical formula PCl3, is a reactive inorganic compound that appears as a colorless to pale yellow fuming liquid with a sharp, irritating odor. It is widely used as a key intermediate in the manufacture of organophosphorus chemicals. These downstream products include agricultural pesticides, specialty plasticizers, flame retardants, and various performance additives used across industrial sectors. PCl3 serves as an important building block in phosphorus chemistry because of its ability to participate in chlorination and substitution reactions. Its high reactivity makes it valuable in controlled synthesis processes but also contributes to its hazardous nature. When exposed to moisture, phosphorous trichloride can hydrolyze, releasing corrosive hydrogen chloride vapors and forming phosphorous acids. Due to its corrosive and toxic properties, strict handling precautions are essential. Direct contact may result in severe skin and eye burns, and inhalation of vapors can cause significant respiratory injury and systemic effects. Safe handling requires chemical resistant gloves, protective eyewear, face shields, and properly engineered ventilation or fume extraction systems. Storage must be in tightly sealed, corrosion resistant containers kept dry and isolated from strong bases, oxidizers, and other incompatible substances. In the event of a spill, prompt containment, neutralization, and controlled cleanup are critical to minimize environmental and health risks. Careful adherence to established safety protocols is mandatory when working with phosphorous trichloride.

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