Overview

DCOIT (4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one) is a highly active isothiazolinone-based biocide formulated to control biofouling in extreme marine and industrial conditions. With a broad antimicrobial spectrum, it is effective against bacteria, algae, yeast, and fungi even in low concentrations. DCOIT exhibits excellent compatibility with resin systems, making it ideal for antifouling marine paints, adhesives, and coatings. It has low water solubility and a controlled-release profile, reducing environmental discharge while ensuring long-term protection. DCOIT meets regulatory approvals in many regions as a safer alternative to persistent heavy-metal-based biocides. It is particularly effective in antifouling paints for ships and underwater structures due to its stability and low leaching profile. DCOIT biodegrades rapidly in aquatic systems, making it an environmentally safer alternative to heavy-metal biocides like copper oxide.

Benefits

• Broad-Spectrum Efficacy – Active against fungi, algae, bacteria, and biofilm-formers

• Excellent Marine Stability – Performs reliably in saltwater and submerged conditions

• Low Leaching Profile – Ensures prolonged protection with minimal environmental impact

• Biodegradable in Water – Breaks down rapidly in aquatic environments

• Compatible with Resins – Easily incorporated into paints, coatings, and polymers

• Heavy-Metal-Free Alternative – Safer than traditional copper-based antifoulants

Applications

• Marine Antifouling Coatings – Protects ship hulls, submerged structures, and offshore platforms

• Cooling Water Systems – Prevents microbial slime and biofilm formation

• Paints & Industrial Coatings – Preserves paint integrity and resists microbial degradation

• Adhesives & Sealants – Ensures microbial resistance in humid environments

• Wood Preservation – Guards against fungal and algal attack in treated timber

• Personal Care Products – Used in formulations (with controlled use levels) for microbial protection

Properties Table