It becomes less poisonous. The active principles of a disinfectant, insecticide or chemical defensive are effective with an expiry date. Over time, they all lose their power of action. Assets are degraded and, therefore, it is more correct to say that they become less efficient, although they are not inert. Some factors, such as sunlight, heat and humidity, accelerate the deterioration of these chemical compounds. However, in general, the expiration date on the packaging does not exactly correspond to the complete aging of the product, especially if it is kept in suitable placesv, without exposure to the sun. In any case, the Health Surveillance Agency (Anvisa) requires the manufacturer to collect expired products.
There may also be sales when the store has a deadline to meet sales targets or is about to close – then, almost everything goes on sale
SOURCES National Health Surveillance Agency; Iran de Soares, chemist at Sanigrans
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