Unfortunately there are widely used refractometers which have just one scale for for measuring of windscreen washer fluids. There are several refractometers with different scales designed for measuring of windscreen washer fluids. It is necessary to select the correct refractometer to be not unpleasantly surprised by the measurement results. Therefore it is necessary to know not only which substance we measure but also which device we should to use. Watch out, because the Isopropanol + water mixture and Ethanol + water mixture have completely different dependence of the refractive index on their concentrations! Due to the costs and availability is in Europe mostly used Ethanol. The main antifreeze alcoholic ingredient is usually one of the alcohols, which we will continue to talk – Isopropyl alcohol, Ethanol or toxic Methanol. Because we know the dependence of the refractive index on the alcohol/water mixture concentration and we know also the dependence of freezing point on that concentration, we are able to determine the freezing point (temperature of solidification) of mixtures by using a refractometer.Ī windscreen washer fluid contains water, main antifreeze ingredient (an alcohol) and the additional ingredients (polyhydric alcohols such as ethylene glycol, propylene glycol or Glycerin etc.). We do not measure directly the freezing point, in the fact we measure refractive index (see Snell's law). I bought the windscreen washer fluid declared as -40 ☌, but by using a refractometer I measured only -27 ☌ĭetermination of freezing point using a refractometer is an indirect method of measurement. We would like to thank him for the kind permission to use his work and also for the final review of this text. Jan Skolil, head of quality and development in company CLASSIC Oil s.r.o., the leading producer of windscreen washer fluids in the Czech Republic. The basis for this article, several papers published by Ing. We will try to answer in this article some of the frequently asked questions to the quality of windscreen washer fluids (windshield wiper fluid, wiper fluid, screen wash, washer fluid). Home Encyclopedia Refraktometers for motorists Windscreen washer fluids (ScreenWash) - frequently asked questions Windscreen washer fluids (ScreenWash) - frequently asked questions
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