Properties: Tech .is a yellow-rown to brown liquid, which sometimes tends to crystallise partly at room temperature. M.p. 34-35 C . cis-isomers 63-65C;trans-44-47C;B.p.200 C/0.1mmHg. 290C/760mmHg; V.p. cis-0.0025mPa; trans-0.0015mPa (both 20 C ). Soluble in water 60-3mg/L (pH 7 ,20 C ). In xylene, hexane 1000,methanol 258(all in g/kg,25C) Stability: Stable to heat(≥2y at 50C),more stable in acidic than alkaline media with optimum stability c. pH4;DT50.50d(pH9),stable( pH5,7)(all 25C).Some photochemical degradation observed in laboratory studies, but field data indicate this does not adversely affect biological performance.