Dicamba (CAS 1918-00-9) is a benzoic-acid systemic herbicide that acts as a synthetic auxin, supplied as an off-white to tan crystalline solid in technical grade at ≥98% purity, and is used for selective post-emergence control of annual and perennial broad-leaved weeds in crops such as cereals, maize, sorghum and sugarcane. Density 1.57 g/cm³, melting point 114–116 °C, vapour pressure 4.5 mPa at 20 °C. Moderately soluble in water (6.5 g/L at 25 °C, pH-dependent), highly soluble in polar organics. It is a benzoic-acid systemic herbicide that acts as a synthetic auxin, rapidly absorbed by leaves and roots and translocated throughout the plant.
Typical Properties
| Molecular formula | C8H6Cl2O3 |
|---|---|
| Molecular weight | 221.04 g/mol |
| Form | Crystals |
| Color | White |
| Melting point | 114-116 °C |
| Density | 1.57 g/cm³ @ Temp: 25 °C |
| Water solubility | 50 g/100 mL |
| Flash point | 2 °C |
| GHS signal word | Danger · Corrosive, Irritant / harmful, Environmental hazard |
| HS code | 29189900 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Dicamba
Applications
Selective post-emergence control of annual and perennial broad-leaved weeds in cereals, maize, sorghum, sugarcane, turf, pastures, rangeland, non-crop, and forestry. Widely used on dicamba-tolerant (DT) soybean, cotton, and maize. Often tank-mixed with glyphosate, 2,4-D, or other herbicides for resistance management and broader spectrum.
Safety & Risks
Acute toxicity low (LD50 oral rat >2000 mg/kg); moderate eye irritant (H319), skin sensitiser possible. Chronic concerns include potential endocrine disruption and developmental toxicity (EPA/EU review ongoing). Low bioaccumulation, moderate aquatic toxicity (fish LC50 ~100 mg/L). Stable under normal conditions but hydrolyses in strong alkali. Use PPE (gloves, goggles, respirator if dusty); ventilate; avoid drift to sensitive crops.
Packaging
Technical grade supplied in 25 kg or 500 kg multi-wall paper bags or fiber drums with PE liners; formulated products in 10–20 L HDPE coex jerricans or 200 L drums; store cool, dry, well-ventilated, away from food/feed.