Composition Tech. material is >91% pure.
Mol. wt. 523.4
Form White powder; ( tech. , off-white to buff or beige powder).
M.p. 228-232 ºC (tech. )
V.p. <<0.001 mPa (20 °C, gas saturation method)
KOW logP = 8.5 Henry <1×10-1 (pH 5.2); <1×10-3 (pH 7.4); <1×10-5 ( pH 9.3) (all in Pa m3 mol-1, calc.)
S.g./density 1.42 (25 °C, tech.)
Solubility In water 3.8×10-3 ( pH 5.2), 0.24 (pH 7.4), 10 (pH 9.3) (all in mg /l, 20 °C). In acetone 20, chloroform 3, benzene <6 (all in mg /l, 20 ºC).
Stability Thermally (up to 50 ºC) and photolytically (30 d in direct sunlight) stable. Degraded by u.v. light when in solution.
pKa A very weak acid which is too lipophilic to form water-soluble salts.
Mode of Action:
Oral Acute oral LD50 for male rats 0.4, male rabbits 0.2, male mice 0.4, female guinea pigs 2.8, cats c. 25, dogs 0.25-3.6 mg/kg. Skin and eye Acute percutaneous LD50 for rabbits 0.25-0.63 mg/kg. Slight to mild skin and eye irritant (rabbits). A moderate skin sensitiser (guinea pigs), but negligible risk of sensitisation from formulated product.