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Stannous octoate CAS 301-10-0 is a tin-based organometallic compound formally known as Tin(II) 2-ethylhexanoate (also called stannous 2-ethylhexanoate, tin bis(2-ethylhexanoate), or tin(II) octoate).
CAS number: 301-10-0
Chemical name: Tin(II) 2-ethylhexanoate (Stannous octoate)
Molecular formula: C₁₆H₃₀O₄Sn
Molecular weight: ~405.1 g/mol
Appearance: pale yellow to light brown liquid or paste, depending on form and purity.
Stannous octoate is an organotin compound in which tin is in the +2 oxidation state (Sn²⁺) coordinated by 2-ethylhexanoate (octoate) ligands. It is typically a viscous liquid that is soluble in organic solvents but not in water and has a relatively high flash point and low vapor pressure.
Stannous octoate is principally used as a catalyst and polymerization initiator in industrial chemistry:
Polyurethane production: It catalyzes the reactions that form flexible and rigid polyurethanes (foams, coatings, elastomers).
Polylactic acid (PLA) polymerization: It initiates ring-opening polymerization of lactide for biodegradable plastics.
Silicone rubber curing: In some formulations, it helps cure room-temperature-vulcanizing (RTV) silicones.
It can also act as an antioxidant in polymer foams after reaction.
This compound is considered hazardous if improperly handled: it may irritate skin and eyes, and there are suspected reproductive hazards and aquatic toxicity concerns. Basic protective measures (gloves, goggles, ventilation) are recommended when working with it.
Stannous octoate’s effectiveness as a catalyst comes from the Sn²⁺ center’s ability to coordinate reactants and lower the activation energy of polymerization reactions — which is why it’s widely used in polyurethane and biopolymer manufacturing.
