I want to be able to re-impregnate a couple of mosquito nets with Permethrin in preparation for a trip to Ghana. One used to be able to buy a little bottle of this, with clear instructions (including not to contaminate the environment) from travel stores. However, they all seem to have discontinued this product, and I have acquired some via Amazon from Italy. The only problem is that the instructions are in Italian. They seem to be describing dilution and use as a spray, rather than what I reckon I need, which is to produce a 0.5% mixture of max 500ml. My calculation tells me that 2.5ml (how do I measure that little?) of PERTRIN S in 500ml water would give me that. The bottle contains 250ml, so good for about a century, I reckon!
Amazon description:
"Liquid concentrated insecticide in aqueous phase with killing and residual action. 250 ml for civil and industrial use. Medical-surgical areas - Registration No. 11809 of the Italian Ministry of Health. Composition: 100 g of the product contains permethrin tec. (25/75 cis-trans) 5.0 g, tetramethrin 0.75 g, piperonyl butoxide tec. 3.0 g, emulsifiers, carriers and sufficient water for 100 g. Characteristics: Pertrin S is an odourless and non-flammable concentrated insecticide to be diluted in water before application. It is effective against all environmental insects: domestic, civil and industrial (excluding food industries). Pertrin S has both a residual effect, produced by permethrin, and a killing and expelling effect produced by tetramethrin, synergised with piperonyl butoxide."
Italian instructions for use:
"Contro moshe ed altri insetti volanti: diluire in acqua impiegando il 2% di PERTRIN S per infestazioni normali e come dose di mantenimento, oppure il 3% per infestazioni forti o per ottenere un maggiore effetto residuale. Applicare poi l’emulsione così ottenuta con i normali nebulizzatori a mano o meccanici sia del tipo a freddo che a caldo sulle superfici infestate dagli insetti, distribuendo circa 1 litro di emulsione ogni 15 mq. Per trattamenti in esterni ed in particuolare per la lotta adulticida contro le zanzare PERTRIN S può essere impiegato in percentuali varianti dallo 0,25% allo 0,5% (250 – 500 ml in 100 lt d’acqua)."
Any chemists fluent in Italian able to help?