... WHO requirement Washes at leas 20times, Min 5 years Insecticide Mosquito Net Net specifications:Material:100% Polyester, 32 ... cm130x180x250180x180x250All sizes will have a tolerance ± 5%. Deltamethrin Insecticide:Deltamethrin lasts 4-5 years, This net has been ... protection, unlike permathrin which only lasts about 1 year. Insecticide-treated mosquito nets, if used properly, are one ...