Welcome. Sumitomo Chemical's Olyset Net was the first long-lasting insecticidal net (LLIN) to be submitted to the World Health Organization Pesticide Evaluation Scheme (WHOPES) for evaluation and was the first LLIN to receive a full WHO recommendation.

Sumitomo Chemical is active in helping the world control insect vectors which transmit diseases, cause human sickness and mortality, and contribute to poverty throughout the world.