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

Dow SEA-NINE 211 Biocide

Dow SEA-NINE 211 Biocide is a high-performance, non-oxidizing marine antifoulant from Dow’s SEA-NINE® series. It delivers long-lasting protection against barnacles, algae, and other fouling organisms on ship hulls and offshore structures. Its active ingredient, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), ensures rapid kill and residual efficacy with low environmental impact in seawater.
  • dow sea nine 211 biocide_d77ab8e3
  • dow sea nine 211 biocide_d77ab8e3

Features Of Dow SEA-NINE 211 Biocide

  1. Highly effective against marine microfouling organisms, including bacteria, algae, and barnacle larvae.

  2. Non-copper, non-tin formulation compliant with current global antifouling regulations.

  3. Controlled leaching technology ensures long-term performance and reduced environmental impact.

  4. Compatible with a broad range of marine coatings, including acrylics, vinyls, and polyurethanes.

  5. Stable under prolonged UV exposure and seawater immersion conditions.

Typical Applications Of Dow SEA-NINE 211 Biocide

  1. Antifouling paints for commercial shipping vessels.

  2. Protective coatings for offshore oil & gas platforms and subsea infrastructure.

  3. Fouling control in marine aquaculture netting and equipment.

  4. Coatings for recreational boats and yachts operating in diverse salinity environments.

Specifications Of Dow SEA-NINE 211 Biocide

Chemical TypeOrganotin-free, synthetic heterocyclic biocide (4,5-dichloro-2-n-octyl-3(2H)-isothiazolone)
Product FormFree-flowing crystalline powder
AppearanceWhite to off-white crystalline solid
Solubility in WaterLow (0.2–0.3 g/L at 20°C)
Melting Point68–72°C
pH Stability Range4–10 (in formulated systems)
Primary ApplicationsMarine antifouling coatings, fouling-release systems
Key FeaturesNon-bioaccumulative, low aquatic toxicity profile relative to legacy biocides


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