The main factors affect the contact action is physical and chemical properties of insect cuticle structure and tag agent: the cuticular wax contained, lipids and proteins tanning compounds are non-polar (hydrophobic material) and water, no affinity . Fat-soluble strong, water-soluble weak wholesale 5% diazinon granules, can not easily be wetted water. Insecticides Properties: Pharmacy and insect body wall affinity 5% diazinon granules manufacturers, mainly as absolute pesticide emulsifier used in the process, the role of wet exhibition and a solvent. Emulsifiers and surface activity agent wet exhibition, agents can easily insect body wall wetting and spread 5% diazinon granules, soluble solvent in the waxy cuticular lipids and tanning China protein, and carrying agent through the epidermis. Insect body wall of the outer skin, the epidermis is made of chitin and protein composed of a hydrophilic substance may be permitted by polar compounds.