Nicotine sulfate 40% is a formulation where nicotine is combined with sulfuric acid to create a salt form. It is commonly used as an insecticide in agricultural applications to control pests such as aphids, thrips, and caterpillars. This concentration indicates that the formulation contains 40% nicotine sulfate and 60% other inert ingredients or carriers. When using nicotine sulfate 40%, it's essential to follow all safety guidelines and regulatory requirements to ensure proper application and minimize environmental impact.