SDMDC

SDMDC, or Sodium Dimethyldithiocarbamate, is a fast-acting, non-oxidizing biocide widely used for microbial control in industrial water systems, cooling towers, paper mills, and oilfield applications. It is particularly effective against bacteria, fungi, and algae, including slime-forming organisms.

Overview

Sodium Dimethyldithiocarbamate (SDMDC) is a broad-spectrum microbiocide based on the dithiocarbamate chemistry, which works by chelating metal ions and disrupting microbial enzymatic systems. It is highly effective against bacterial, fungal, and algal populations in industrial process water and other contaminated systems. SDMDC is stable across a wide pH range and decomposes rapidly after use, making it environmentally favorable. It is widely used in paper mills to prevent microbial spoilage, in cooling water to control slime and fouling, and in oilfields to maintain the integrity of injection water. Its low dosage requirement and strong efficacy make it an economical choice for large-scale operations.

Benefits

  • Fast-Acting Biocide – Rapid knockdown of microbial populations in active systems

  • Broad-Spectrum Control – Effective against bacteria, fungi, and algae

  • Non-Oxidizing Formula – Safe for use in corrosion-sensitive environments

  • Stable Across pH Range – Performs consistently from pH 5 to 9

  • Low Dosage, High Efficiency – Reduces chemical costs in large volume applications

  • Environmentally Friendly Degradation – Breaks down into non-toxic residues after use

Applications

  • Cooling Towers & Heat Exchangers – Controls microbial growth and prevents biofilm accumulation

  • Pulp & Paper Industry – Prevents slime formation and spoilage during the wet-end process

  • Oilfield Water Treatment – Inhibits sulfate-reducing and iron bacteria in injection systems

  • Recirculating Water Systems – Used in HVAC, manufacturing, and water-cooled systems

  • Wastewater Treatment – Reduces microbial load and assists in sludge control

  • Industrial Cleaning Formulations – Used in antimicrobial detergent and surface cleaner blends

Properties Table

Property Details
Product Name SDMDC
Chemical Name Sodium Dimethyldithiocarbamate
Chemical Type Non-oxidizing dithiocarbamate biocide
Active Ingredient SDMDC (≥40% in aqueous solution or >98% as solid)
Physical Form Liquid or powder
Appearance Yellow to amber liquid / pale yellow solid
Odor Slight sulfurous odor
pH (1% Solution) ~9.0 – 10.5
Solubility Completely soluble in water
Density @ 25 °C ~1.18 g/cm³ (liquid)
Flash Point Non-flammable (aqueous form)
Recommended Use Level 50 – 300 ppm depending on application severity
pH Stability Range 5.0 – 9.0
Shelf Life 12–18 months (sealed container)
Packaging Options 25 kg drums, 250 kg barrels, 1000 kg IBCs

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