The aquatic concentrations are expected to be at least three orders of magnitude less than the ecotoxicity results presented above and indicate Dynasylan BSM 100 N is unlikely to present either an acute or chronic hazard to aquatic invertebrates, freshwater fish and microorganisms at likely environmental levels. If the notified chemical and/or its condensate (polymer) does bind to sediment to some extent it is unlikely that significant toxic levels of the notified chemical or the polymer will occur due to the indicated high level of biodegradation and expected lack of bioaccumulation potential. Recent reviews of the environmental fate and effects of polysiloxanes suggest that any Dynasylan BSM 100 N released to the aquatic compartment will become a permanent but biocompatible resident of sediments (17). ASSESSMENT OF PUBLIC AND OCCUPATIONAL HEALTH AND SAFETY The likely modes of exposure to Dynasylan BSM 100 N are via inhalation, dermal or eye exposure during application. Animal tests have demonstrated that Dynasylan BSM 100 N is of low oral toxicity but causes slight irritancy to the eyes,and mild to moderate irritancy to skin and the respiratory system. The impurities present are not expected to be hazardous. Once dried onto the concrete Dynasylan BSM 100 N is inert and provides no hazard. Dynasylan BSM 100 N has potential to be a fire hazard due to the ethanol vapours that are produced by hydrolysis during its use. The low flash point of 66°C is further reason to take care with sources of heat. The chemical has a low vapour pressure but is expected to vaporize to some extent during the application procedure. Dynasylan BSM 100 N is not reported to have any hazardous degradation products. Provided that the precautions recommended by the manufacturer are adhered to it is unlikely that Dynasylan BSM 100 N cause any significant public or occupational health problems.
The aquatic concentrations are expected to be at least three orders of magnitude less than the ecotoxicity results presented above and indicate Dynasylan BSM 100 N is unlikely to present either an acute or chronic hazard to aquatic invertebrates, freshwater fish and microorganisms at likely environmental levels. If the notified chemical and/or its condensate (polymer) does bind to sediment to some extent it is unlikely that significant toxic levels of the notified chemical or the polymer will occur due to the indicated high level of biodegradation and expected lack of bioaccumulation potential. Recent reviews of the environmental fate and effects of polysiloxanes suggest that any Dynasylan BSM 100 N released to the aquatic compartment will become a permanent but biocompatible resident of sediments (17). ASSESSMENT OF PUBLIC AND OCCUPATIONAL HEALTH AND SAFETY The likely modes of exposure to Dynasylan BSM 100 N are via inhalation, dermal or eye exposure during application. Animal tests have demonstrated that Dynasylan BSM 100 N is of low oral toxicity but causes slight irritancy to the eyes,and mild to moderate irritancy to skin and the respiratory system. The impurities present are not expected to be hazardous. Once dried onto the concrete Dynasylan BSM 100 N is inert and provides no hazard. Dynasylan BSM 100 N has potential to be a fire hazard due to the ethanol vapours that are produced by hydrolysis during its use. The low flash point of 66°C is further reason to take care with sources of heat. The chemical has a low vapour pressure but is expected to vaporize to some extent during the application procedure. Dynasylan BSM 100 N is not reported to have any hazardous degradation products. Provided that the precautions recommended by the manufacturer are adhered to it is unlikely that Dynasylan BSM 100 N cause any significant public or occupational health problems.
NA70FR.docx