Nano particles were not the cause of health problems triggered by sealing sprays
Products did not contain any ultrafine particles
Immediately after the occurrence of the first cases, BfR set out obtaining the exact formulation of the products from the manufacturers in order to establish the causes of the incidents. An expert meeting with the companies responsible for manufacturing the sprays at BfR on 23 May 2006 revealed that the products do not, in fact, contain any nano particles. This was also confirmed by chemical analyses commissioned by BfR from two specialist laboratories. Hence, nano particles are not a potential cause of the health problems experienced by users.
The extent to which other components in the products caused the symptoms has not yet been fully elucidated. However, there is no doubt that the same liquid, which does not contain any nano particles either, was sold for several years as a pump spray without any health impairments being notified. Taking into account ongoing studies another expert meeting at BfR will aim to identify, the toxic mechanisms responsible for the disorders that occurred after inhaling the aerosols.
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