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EC number: 701-124-4
CAS number: -
PMDI reacts readily with water to form predominantly insoluble and inert polyurea (Yakabe et al 1994) and therefore long-term tests are not appropriate for the derivation of PNEC values.In a study with Daphnia magna (Caspers et al, 1986) no long-term toxicity was observed after 21d exposure to 10mg/L. The test was carried out according to OECD Guideline 211 and the result was corroborated by the mesocosm study where no chronic effects were seen to the zooplankton at 1000 and 10,000 mg/L.
PMDI is rapidly hydrolysed in aqueous solution. However, PMDI is
hydrophobic and poorly soluble in water and thus the heterogeneous
reaction with water or soil is less rapid. The major product of such a
reaction is insoluble polyurea.
In the production of PMDI the formation of insoluble polyurea would
cause abrasion problems and blockage of valves and pipes and therefore
releases of PMDI to effluents are expected to be non-existent. Since
production is performed in closed systems, releases to soil and sediment
are also expected to be negligible.
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