FORM 2 THE PATENTS ACT, 1970 (39 of 1970) PROVISIONAL SPECIFICATION (See Section 10) "A NOVEL AND IMPROVED SYNERGISTIC COMPOSITION" We , UNITED PHOSPHORUS LIMITED, a company incorporated under the Companies Act, 1956 and having its registered office at 3-11, GIDC, Vapi-396 195, State of Gujarat, India, INDIAN. The following specification describes the invention: 1 Field of the Invention The present invention relates generally to a storage stable composition of Lambda Cyhalothrin. More particularly it relates to a composition in the form of emulsifiable concentrate by using a dispersant system as a stabilizer for the impurities causing turbidity to the formulation. Background of the Invention Lambda Cyhalothrin is a reaction product comprising equal quantities of (R)-a-cyano-3- phenoxybenzyl0(lS,3S)-3-[(Z)-2-chloro-3,3,3-trifluoropropenyl]-2,2-dimethylcy clopropanecarboxylate and (S)-a-cyano-3-phenoxybenzyl (lR,3R)-3-[(Z)-2-chloro-3,3,3- trifluoropropenyl]-2,2-dimethylcyclopropanecarboxylate, CAS name is (7?)-cyano(3- phenoxyphenyl)methyl (15,,35)-re/-3-[(lZ)-2-chloro-3,3,3-trifluoro-1 -propenyl]-2,2-dimethylcyclopropanecarboxylate. It is used as an insecticide (pyrethroid ester insecticides) and has the chemical structure, "• Lambda Cyhalothrin is a pyrethroid insecticide registered by the U.S. Envionmental protection Agency (EPA) in 1988. Pyrethroids are synthetic chemicals that are structurally 2 similar to the natural insecticides pyrethrins. Scientists developed pyrethroid insecticides to have enhanced biological activity and desired physical and chemical properties relative to pyrethrins. Lambda Cyhalothrin is similar to the pyrethroid Cyhalothrin. Pyrethroids affect the nervous system of an organism or insects. They act by disrupting the gating mechanism of sodium channels that are involved in the generation and conduction of nerve impulses. Pyrethroid disrupt the sodium channel activation gate by keeping it in open position. Delayed closing of the gate results in prolonged excitation of nerve fibers, thus causes paralysis and death of the insects. Cyhalothrin is a mixture of four isomers, and two of these isomers compose Lambda Cyhalothrin. Due to their similarity, researchers sometimes use toxicity tests conducted with Cyhalothrin to evaluate the toxicity of Lambda Cyhalothrin. Lambda Cyhalothrin is a colorless to beige solid that has a mild odor. It has a low water solubility and is nonvolatile. Technical Cyhalothrin is a mixture of 4 isomers. 1) A pair of enantiomers: (Z(l R) cis(R)alpha-CN and Z(l S) cis(S)alpha-CN) 2)B pair of enantiomers: (Z(l R) cis (S)alpha- CN and Z(l S) cis(R)alpha-CN. The enantiomers are present in equal amounts within each pair. Lambda -Cyhalothrin consists entirely of the B pair of enantiomers. F r c=c. P (s)-alcohol (Z)-(1R)-c/s-acid C—O, / H D o - MX H> u u n CK \__y LAMBDA H (R)-alcohol (Z)-(1S)-e/'s-acid ^N -, MX C—C C-—C' -^