Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Tributyltin Oxide

Dow AgroSciences Organotin TBT-OX-100 Tributyltin Oxide is a biocidal organotin compound used in marine antifouling paints and wood preservatives. It effectively inhibits algae and barnacle growth via tin-mediated enzyme disruption. Highly lipophilic and persistent in aquatic environments but phased out in many regions due to ecotoxicity concerns. Supplied as white crystalline solid with 98% purity.
  • tributyltin oxide_faacd6be
  • tributyltin oxide_faacd6be

Features Of Tributyltin Oxide

  1. Highly effective biocide with broad-spectrum activity against fungi, bacteria, and algae.

  2. Thermally stable up to 200 °C, enabling incorporation into high-temperature polymer processing.

  3. Low volatility and minimal leaching in properly formulated matrices, supporting long-term efficacy.

  4. Excellent compatibility with PVC, polyolefins, and silicone-based elastomers.

  5. Acts as both a biostatic and biocidal agent, inhibiting microbial growth and preventing biofilm formation.

Typical Applications Of Tributyltin Oxide

  1. Antifouling additives in marine coatings for ship hulls and offshore structures.

  2. Biocontrol agent in industrial water treatment systems (e.g., cooling towers, paper mill process water).

  3. Preservative in PVC-based construction materials, including sealants, adhesives, and roofing membranes.

  4. Fungistatic component in wood preservatives for non-residential outdoor applications.

  5. Stabilizer and antimicrobial co-additive in silicone rubber used for HVAC gaskets and medical device housings.

Specifications Of Tributyltin Oxide



Chemical TypeOrganotin compound (triorganotin oxide)
CAS Number56-36-0
Product FormWhite to off-white crystalline powder
AppearanceFree-flowing, odorless solid
Melting Point105–115 °C (decomposes above 180 °C)
Purity (by GC)≥ 97.0%
Primary ApplicationsAntifouling, industrial biocide, polymer preservative
Regulatory ComplianceREACH registered; not authorized for consumer biocidal products under EU BPR


Compatible Systems Of Tributyltin Oxide

Common Compatible SystemsSuitability
Polyvinyl Chloride (PVC) compoundsHighly Recommended – Excellent dispersion and thermal stability during extrusion/calendering
Silicone elastomers (HTV & RTV)Recommended – Stable below 150 °C; enhances resistance to mold in humid environments
Solvent-based marine antifouling paintsHighly Recommended – Maintains biocidal activity and film integrity in epoxy and chlorinated rubber binders
Aqueous industrial coolant formulationsSuitable – Requires pH control (7.5–9.0) and chelant stabilization to minimize hydrolysis

Tributyltin Oxide – Frequently Asked Questions (FAQ)

Q1: What is the CAS number for Tributyltin Oxide?

A: The CAS Registry Number for Tributyltin Oxide is 56-36-0.


Q2: What is the typical loading range when using Tributyltin Oxide in PVC formulations?

A: Standard dosage ranges from 0.2 to 1.0 phr (parts per hundred resin), depending on end-use requirements and regulatory constraints.


Q3: How does Tributyltin Oxide compare to newer alternatives like silver zeolites or isothiazolinones?

A: Tributyltin Oxide offers superior longevity and thermal resilience but faces stricter regulatory restrictions; alternatives provide lower ecotoxicity yet may lack equivalent persistence in harsh environments.


Q4: Is Tributyltin Oxide subject to migration or extraction in aqueous contact scenarios?

A: Yes — hydrolysis can occur in acidic or highly alkaline water, releasing Bu₃Sn⁺ species; formulation with hydrophobic resins and pH buffering significantly reduces extractable tin.



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