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Dazomet

Identification

Synonyms: 3,5-dimethyl-1,3,5-thiadiazinane-2-thione (IUPAC); DMTT; Tiazon; 'Basamid' (Advan, Agro-Kanesho, Certis). Other products 'Dacorn' (Vapco); 'Dazom' (Chemia); 'Fongosan' (Kwizda). Discontinued products 'Dacron' * (Vapco); 'Dazoberg' * (Chimiberg); 'Mylone' * (Union Carbide); 'Salvo' * (Stauffer).
CAS No.: 533-74-4
EC No.: 208-576-7
Molecular Weight: 162.3
Molecular Formula: C5H10N2S
Structural Formula: dazomet
Form Colourless crystals; (tech. is an off-white to yellowish solid, with a sulfurous odour).
M.p. 104–105 °C (decomp.; tech. grade)
V.p. 0.58 mPa (20 °C); 1.3 mPa (25 °C)
Kow logP = 0.63 (pH 7)
Henry 2.69 × 10-5 Pa m3 mol-1
S.g./density 1.36
Solubility In water 3.5 g/l (20 °C). In cyclohexane 400, chloroform 391, acetone 173, benzene 51, ethanol 15, diethyl ether 6 (all in g/kg, 20 °C).
Stability Stable at temperatures up to 35 °C. Sensitive to temperatures >50 °C, and to moisture. Aqueous hydrolysis DT50 6–10 h (pH 5), 2–3.9 h (pH 7), 0.8–1 h (pH 9) (all 25 °C) (FAO Specifications).

Application

Dazomet is a pre-planting soil fumigant, acting by decomposition to methyl isothiocyanate. Used as soil sterilant, applied prior to planting out crops, at 200–600 kg/ha. Controls soil fungi (Fusarium, Pythium, Rhizoctonia, Sclerotinia and Verticillium spp., and Colletotrichum coccodes), nematodes, germinating weed seeds, bacteria and soil insects. Also used as a slimicide in pulp and paper manufacture, and as a preservative in adhesives and glues. Phytotoxicity Highly phytotoxic to all green plants. Treated soils should not be planted until shown to be free of dazomet and its degradation products.

Specification

98% granular TC; 98% powder TC
Preparation: 50% WP; 80% WP

Standard Packaging

20kgs/multi-ply bag, on pallet.

Packaging photo coming soon

Risks and Safety Information

Dazomet is regulated by UN as hazardous substance UN 3077, Class 9, PG III

Acute oral LD50 for rats 519 mg/kg. Skin and eye Acute percutaneous LD50 for rats >2000 mg/kg. Inhalation LC50 (4 h) for rats 8.4 mg/l air. NOEL NOAEL (90 d) for rats 1.5 mg/kg b.w. daily. Birds LD50 for bobwhite quail 415 mg/kg b.w. Fish LC50 (96 h) for rainbow trout 0.16 mg/l. Algae EC50 (96 h) for Scenedesmus subspicatus 1.0 mg/l. Bees Not toxic to bees when used as directed. LD50 (oral) >10 μg/bee; (contact) >50 μg/bee.

Warning, Hazard to environment

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