Sodium Dimethyldithiocarbamate (SDDC)
1. Basic Identification
- Chemical Name: Sodium dimethyldithiocarbamate
- Abbreviation: SDDC, NaDMDTC
- Synonyms: Sodium N,N-dimethyldithiocarbamate, Dimethyldithiocarbamic acid sodium salt
- EINECS No.: 205-760-8
- MDL No.: MFCD00004858
- Molecular Formula: \(\boldsymbol{C_3H_6NNaS_2}\)
- Molecular Weight: 143.20
- SMILES: CN(C)C([S-])=S.[Na+]
- UN Number: UN 3077
- HS Code: 2930200090
- Hazard Classification: Class 9 Miscellaneous Dangerous Goods, PG III
- Chemical Category: Dithiocarbamate biocide, heavy metal chelating precipitant, industrial fungicide & water treatment biocide
2. Physical & Chemical Properties
Appearance
Commercial forms: 40% aqueous amber liquid / solid crystalline powder (anhydrous). The aqueous solution has characteristic sulfur odor, stable under neutral/alkaline conditions; decomposes under strong acid to release toxic carbon disulfide gas.
Physical Constants (Anhydrous Solid)
| Parameter | Standard Value | Remarks |
| Melting Point | 122–124 ℃ (decomposes) | Decomposes above melting point to CS₂ and dimethylamine |
| Solubility in Water | Highly soluble | Forms stable alkaline aqueous solution |
| Solubility in Organic Solvents | Soluble in methanol, ethanol; insoluble in benzene, hexane, chloroform |
|
| pH (40% aqueous solution) | 8.5–10.5 | Weakly alkaline |
| Stability | Stable in alkaline medium; rapid hydrolysis under pH <5 releasing CS₂ fumes |
|
Core Chemical Characteristics
- Heavy metal chelating & precipitation performance
Dithiocarbamate anion forms insoluble chelate precipitates with Cu²⁺, Pb²⁺, Cd²⁺, Ni²⁺, Zn²⁺, Hg²⁺; widely used for heavy metal wastewater treatment. - Broad-spectrum biocidal & fungicidal activity
Inhibits microbial enzyme activity, suppresses bacteria, algae, fungi, slime organisms in industrial circulating water. - Acid-sensitive decomposition
Contact with acid releases highly toxic, flammable carbon disulfide vapor and dimethylamine irritant gas; strictly avoid mixing with acidic substances. - Vulcanization accelerator intermediate
Raw material for rubber vulcanization accelerators (zinc dimethyldithiocarbamate ZDMC). - Incompatible materials: Mineral acids, chlorine-based oxidants, alum, acidic flocculants, edible chemicals.
3. Export Industrial Quality Specifications
40% Aqueous Biocide Grade (Mainstream Export)
| Test Item | Standard Spec | Test Method |
| Sodium dimethyldithiocarbamate content | 40.0 ±1.0 wt% | Titration with copper standard solution |
| Free dimethylamine | ≤0.30 % | GC |
| Free sulfide ion (S²⁻) | ≤0.05 % | Iodometric titration |
| pH value (undiluted liquid) | 8.5–10.5 | pH meter |
| Heavy metal (Pb, Cd) | ≤10 ppm | AAS |
| Color | Amber clear liquid, no suspended sediment | Visual Inspection |
Solid Anhydrous Powder Grade ≥98.0%
Low moisture, used for solid compound fungicide formulations and heavy metal solid precipitant agents.
4. Main Industrial Applications
4.1 Industrial Circulating Cooling Water Biocide (Largest Consumption)
- Slime control agent for power plant, chemical factory, air-conditioning cooling towers; inhibits algae, bacteria and biofilm to prevent pipeline blockage and microbial corrosion.
- Papermaking white water biocide, eliminates mold and slime microorganisms to improve paper surface quality.
4.2 Heavy Metal Wastewater Treatment Agent
- Chelating precipitant for electroplating, printed circuit board, smelting wastewater; removes residual copper, nickel, lead, cadmium to meet discharge standards.
- Stabilizer for landfill leachate heavy metal fixation, prevents metal ion leaching into soil and groundwater.
4.3 Rubber & Polymer Auxiliary Raw Material
Synthetic precursor of ZDMC (zinc dimethyldithiocarbamate), ultra-fast vulcanization accelerator for natural rubber, latex and synthetic rubber products.
4.4 Agricultural & Leather Industry
- Fungicide for crop seed treatment, inhibits soil pathogenic fungi.
- Antimildew agent for raw hide tanning process, prevents leather mildew during storage.
4.5 Laboratory Analytical Reagent
Special chelating reagent for spectrophotometric detection of trace heavy metal ions in water and soil samples.
5. Toxicology, Health Hazards & First Aid
Toxicity Profile
- Acute Oral LD50 (Rat): 1,000–2,000 mg/kg (Category 4, harmful if swallowed)
- Skin hazard: Moderate irritant, may trigger allergic dermatitis for sensitive population
- Inhalation hazard: Mist irritates nasal and respiratory tract; acid decomposition produces toxic CS₂ vapor which damages nervous system
- Environmental hazard: Highly toxic to fish and aquatic organisms, long-term aquatic risk
Exposure Symptoms
- Inhalation of mist: Throat irritation, cough, dizziness; CS₂ vapor inhalation causes headache, fatigue and neurasthenia.
- Skin contact: Red rash, itching, mild chemical irritation after prolonged contact.
- Eye splash: Stinging, conjunctival congestion and temporary blurred vision.
- Oral ingestion: Nausea, stomach pain, gastrointestinal discomfort.
Complete First-Aid Procedures
- Inhalation: Move victim to fresh air, supply oxygen if breathing difficulty occurs, send to hospital for observation of neurological symptoms.
- Skin Contact: Remove contaminated clothes immediately, rinse skin with plenty of running clean water for at least 15 minutes.
- Eye Contact: Force open eyelids, continuously flush eyes with clean cold water for more than 15 minutes and consult an ophthalmologist.
- Oral Intake: Do NOT induce vomiting; drink large amounts of clean water or milk for dilution and seek emergency medical treatment.
6. Storage, Handling & Incompatibility Rules
Mandatory Storage Conditions
- Warehouse classification: Class 9 miscellaneous dangerous goods warehouse, separated from acids, oxidants, food and feed materials.
- Temperature control: Store at 10–30 ℃, avoid direct sunlight and heating; high temperature accelerates decomposition.
- Sealing requirement: HDPE plastic drums fully sealed to prevent volatile sulfur odor leakage; warehouse equipped with ventilation system.
- Shelf life: 12 months under original sealed packaging; avoid long-term storage after opening.
Strictly Separated Incompatible Materials
All mineral acids, hydrochloric acid, sulfuric acid, chlorine disinfectants, alum, acidic flocculants, edible raw materials.
Safe Operation Specifications
- Operators wear nitrile chemical-resistant gloves, impact safety goggles and dust-proof / mist-proof respirator.
- Avoid mixing with acidic reagents at all times; neutralize waste liquid with alkali before discharge.
- Small liquid leakage: Absorb with dry sand, collect waste into sealed plastic hazardous waste barrels.
- Large leakage: Build sand retaining dikes to contain liquid, prevent infiltration into rivers and sewers.
7. Export Packaging & Global Transportation Regulations
Standard Export Packaging Modes
- 40% liquid grade: 200L HDPE plastic drum
- Solid powder grade: 25kg woven plastic bag with inner PE liner
- Small lab reagent package: 1L / 5L plastic bottle with outer protective carton
UN Transport Compliance Rules
UN 3077, Class 9 Environmentally Hazardous Substance, Packing Group III
- Road transport: Vehicles equipped with ventilation, avoid high-temperature exposure during transit.
- Ocean shipment: Comply with IMDG Code class 9 dangerous goods rules, affix marine pollutant hazard label, stacking height ≤2 layers.
- Loading ban: Mixed loading with strong acids, edible goods and drinking water additives is prohibited.
Full Export Document Package
- Batch Certificate of Analysis (COA)
- GHS-compliant MSDS / SDS
- Technical Data Sheet (TDS)
- Marine Dangerous Goods Declaration
- REACH compliance registration report
8. GHS Global Hazard Label Statements
Signal Word: Warning
Hazard Statements:
H302 Harmful if swallowed
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H400 Very toxic to aquatic life
H410 Very toxic to aquatic life with long lasting effects
Precautionary Statements:
P261 Avoid breathing mist
P280 Wear protective gloves and eye protection
P305+P351+P338 IF IN EYES: Rinse continuously with water for several minutes
P403+P235 Store in a cool, well ventilated place, tightly sealed
P501 Dispose of contents/container as hazardous waste
9. Fire Emergency Disposal Plan
Approved Fire Extinguishing Agents
Dry chemical powder, carbon dioxide (CO₂), water mist
Forbidden Agents
Concentrated acid foam extinguishing agent (acid triggers toxic CS₂ release)
Fire Site Operation Steps
- Evacuate personnel to upwind safe zone, isolate the fire area.
- Cool surrounding plastic drums with water mist to avoid thermal expansion leakage.
- Collect all fire waste liquid to prevent direct discharge into water bodies; treat residues as environmentally hazardous waste.
10. Printable Export COA Template
CERTIFICATE OF ANALYSIS
Product Name: 40% Sodium Dimethyldithiocarbamate Aqueous Solution (SDDC)
CAS No.: 150-46-9
Grade: Export Industrial Biocide Grade
Batch No.: ____________
Net Weight: 200kg/drum
Manufacture Date: ____________
| Test Item | Standard Spec | Test Result | Test Method |
| Sodium dimethyldithiocarbamate Content | 40.0 ±1.0 % |
| Copper Complex Titration |
| Free Dimethylamine | ≤0.30 % |
| GC |
| Free Sulfide Ion | ≤0.05 % |
| Iodometric Titration |
| pH Value | 8.5–10.5 |
| pH Meter |
| Heavy Metal (Pb+Cd) | ≤10 ppm |
| AAS |
| Appearance | Amber clear liquid without sediment | Visual Inspection |
|
Conclusion: This batch complies with export industrial standard of Sodium Dimethyldithiocarbamate.
Inspector Signature: ____________
Issuance Date: ____________
11. E-commerce Listing Copy (Alibaba / Chemical Platforms)
Product Title
Sodium Dimethyldithiocarbamate SDDC CAS 150-46-9 40% Amber Liquid Water Treatment Biocide Heavy Metal Chelating Precipitant Rubber Vulcanization Accelerator Precursor Cooling Water Slime Controller
Short Description
Sodium dimethyldithiocarbamate (C₃H₆NNaS₂, CAS 150-46-9) 40% amber aqueous solution, class 9 environmentally hazardous industrial chemical. Dual functions of broad-spectrum biocide and heavy metal chelating precipitant, widely used for circulating cooling water algae/slime control, electroplating wastewater heavy metal removal and raw material for rubber vulcanization accelerator ZDMC. Full set of UN3077 class 9 dangerous goods export documents COA, MSDS and TDS available for global bulk shipment.
Full Description
Sodium dimethyldithiocarbamate (abbreviated SDDC, CAS 150-46-9) is a typical dithiocarbamate fine chemical, supplied as stable 40% weakly alkaline amber liquid with efficient biocidal and metal chelating properties. It decomposes only under acidic conditions to release carbon disulfide, so storage and application must avoid contact with all acid substances.
Core downstream application sectors: industrial circulating cooling water biocide to inhibit bacteria, algae and biofilm slime; heavy metal wastewater treatment precipitant for electroplating, PCB and smelting plants to remove Cu, Ni, Pb, Cd ions; synthetic raw material of zinc dimethyldithiocarbamate (ZDMC) rubber ultra-fast vulcanization accelerator; leather anti-mildew agent and crop seed fungicide. We supply standard 40% liquid industrial grade and ≥98% anhydrous solid powder grade for different formulation needs.
Packed in sealed HDPE plastic drums for full-container sea shipment. Classified as UN3077 Class 9 environmentally hazardous miscellaneous dangerous goods, we provide complete customs clearance and IMDG transport compliance certificates for stable long-term global supply to water treatment, rubber and electroplating factories.
TDS
India
