Composition Methomyl is a mixture of (Z)- and (E)- isomers, the former predominating. Mol. wt. 162.2 M.f. C5H10N2O2S Form Colourless crystals, with a slight sulfurous odour. M.p. 78-79 V.p. 0.72 mPa (25 ) KOW logP = 0.093 Henry 2.13 ?10-6 Pa m3 mol-1 S.g./density 1.2946 (25 ) Solubility In water 57.9 g/l (25 ). In methanol 1000, acetone 730, ethanol 420, isopropanol 220, toluene 30 (all in g/kg, 25 ). Sparingly soluble in hydrocarbons. Stability Stable in water for 30 d (pH 5 and 7); DT50 c. 30 d (pH 9). Stable up to 140 . Stable to sunlight when exposed for 120 d.
