The Olyset Story

Sumitomo Chemical pioneered a revolutionary technology to develop a net that effectively prevents mosquito biting, lasts for a long time and resists both washing and tearing.  Olyset® incorporates the insecticide permethrin into the actual fibres of the net, and releases it slowly over a number of years.

The Olyset net passed the rigorous testing procedure known as WHOPES (WHO Pesticide Evaluation Scheme). This involved extensive laboratory and field studies held under scientific scrutiny, and a commitment to quality assurance through the publication of agreed specifications. Olyset was the first LLIN to pass WHOPES and earn WHO’s recommendation.



Olyset is unique in many ways:

• Guaranteed to last at least five years – latest research indicates that a seven- or eight-year life is often achievable.
• Ready to use – never needs treatment
• Tough – Olyset  uses polyethylene technology that makes the net stronger and more tear resistant than polyester nets
• Wash proof – Olyset is designated as a LLIN by WHO – this means that it remains effective even when washed twenty times.
• Maximum ventilation – Wide mesh improves air flow
• Controlled release technology – unlike polyester nets, the insecticide in Olyset is contained within the fibre, not coated on the outside.  This technology provides a slow release of the active ingredient which continues to control mosquitoes for more than five years
• Quadruple insecticide effect on mosquitoes – bite inhibition, repellency, knockdown, kill.  All contribute to protection from biting mosquitoes and other insects

The paper Development of Olyset Net as a Tool for Malaria Control provides a detailed technical and production history of Olyset.