• ✅ Two concentrations available: 48-52% and 78-82% liquid grades to meet different application requirements
• ✅ Controlled low foam performance: Exhibits low, fast breaking foam with exceptional dynamic controlled foam properties
• ✅ Superior hard water tolerance: Delivers potent germicidal action even in hard water and high organic soil loads
• ✅ Broad spectrum antimicrobial activity: Effective against bacteria, fungi, viruses and algae
• ✅ Third generation quaternary ammonium compound: Advanced formulation with enhanced biocidal efficacy
• ✅ FIFRA registered formulation ingredient: Meets strict regulatory standards for disinfectant applications
• ✅ Excellent compatibility: Can be compounded with CLO2 and other common industrial chemicals
• ✅ Versatile applications: Suitable for water treatment, disinfection, wood preservation and textile processing
• ✅ Long-lasting protection: Provides extended control of undesirable microbes
• ✅ Strict quality control: Batch-to-batch consistency guaranteed for reliable performance

Dioctyl Dimethyl Ammonium Chloride, commonly known as DDAC, is a high-performance third generation quaternary ammonium biocide with CAS number 5538-94-3. Its molecular formula is C18H40ClN, with a molecular weight of 305.97 g/mol. Our industrial grade product is available in two liquid concentrations: 48-52% and 78-82%, appearing as a clear, pale yellow to straw liquid.

DDAC is composed of twin chain dimethyl ammonium chloride. The dioctyl dimethyl structure provides a controlled foam biocide, exhibiting low, fast breaking foam with exceptional dynamic controlled foam performance. When used as an active ingredient in FIFRA registered formulations such as hard surface disinfectants, sanitizers and/or certain types of water treatment formulations, these products have been found to provide superior biocidal action against a broad spectrum of microbial organisms such as bacteria, fungi, viruses, and algae. This third generation quaternary ammonium compound delivers potent germicidal action in hard water and organic soil loads.

Our DDAC is produced with advanced synthesis and purification technology, with full batch traceability and complete supporting quality documents. We offer both standard concentrations and customized specifications to meet specific customer requirements and ensure long-term stable bulk supply for global industrial manufacturers.

Appearance: Clear, pale yellow to straw liquid

Packaging: 200L plastic drum; 1000L IBC tote; Customized packaging available upon customer request

Storage Conditions: Store in tightly sealed containers in a shady, cool and dry warehouse at 5-30℃; Keep away from heat sources, direct sunlight and strong oxidizing agents; 12-month shelf life under proper storage conditions

Transport Classification: 8 (Corrosive Liquid)

Packing Group: III

• DDAC
• Dioctyl Dimethyl Ammonium Chloride
• N,N-Dioctyl-N,N-dimethylammonium chloride
• Di-n-octyl dimethyl ammonium chloride
• Octyl decyl dimethyl ammonium chloride
• CAS 5538-94-3
• Quaternary Ammonium Biocide DDAC
• Water Treatment Biocide DDAC
• Industrial Disinfectant DDAC

1. Water Treatment Industry (Core Application): Used as fungicide and bactericide for oilfield injection water and industrial circulating cooling water systems. Controls microbial growth, prevents biofilm formation and protects equipment from corrosion.
2. Disinfection & Preservation Industry: Applied as disinfectant, fungicide and wood preservative agent. Used for hard surface disinfection in industrial, commercial and institutional settings, and for preservation of wood products against fungal decay.
3. Textile Industry: Used as mothproofing and antimicrobial agent for textiles and fabrics. Provides long-lasting protection against bacteria, fungi and moths.
4. Hard Surface Disinfection: Can be compounded with CLO2 for enhanced bacterial killing efficacy on hard surfaces. Suitable for use in hospitals, schools, food processing plants and public areas.
5. Other Industrial Fields: Employed in paper manufacturing as a slime control agent, in coatings and paints as a preservative, and in leather processing as an antimicrobial agent.

A1: The main difference is the active ingredient concentration. The 78-82% grade has higher active content, requiring lower dosage for the same biocidal effect and reducing transportation and storage costs. The 48-52% grade is more economical for general applications where higher dilution is acceptable.

A2: The recommended dosage varies by application:

• Industrial circulating cooling water: 10-50 ppm
• Oilfield injection water: 20-100 ppm
• Hard surface disinfection: 0.1-0.5% solution
• Wood preservation: 1-5% solution
• Textile treatment: 0.5-2% by weight of fabric
• The exact concentration depends on the specific application, microbial load and environmental conditions.

A3: Yes, DDAC exhibits excellent hard water tolerance and maintains its biocidal efficacy even in high hardness water and in the presence of organic soil loads. This makes it ideal for industrial water treatment applications.

A4: Yes, DDAC is compatible with most common biocides including chlorine dioxide (CLO2), glutaraldehyde and isothiazolinones. Combining DDAC with other biocides can provide synergistic effects and broader spectrum antimicrobial activity.

A5: DDAC is a corrosive substance and may cause skin and eye irritation. Required PPE includes:

• Chemical-resistant gloves (nitrile or butyl rubber)
• Safety goggles with face shield
• Chemical-resistant apron and protective clothing
• Respiratory protection if working in poorly ventilated areas

A6: DDAC has a shelf life of 12 months when stored in tightly sealed original containers under proper storage conditions. It should be protected from heat, direct sunlight and moisture to maintain its biocidal activity.