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Report of the Board of Review for Decamethylcyclopentasiloxane (Siloxane D5)

6 Conclusions of the Board of the Review

292. The evidence presented to the Board demonstrated that Siloxane D5 exceeded the regulatory threshold for persistence. However, Siloxane D5 did not exceed the thresholds established in the Regulations for bioaccumulation.

293. Siloxane D5 does not biomagnify through the food chain, although it can be accumulated into organisms from environmental matrices or food. That is, concentrations of Siloxane D5 do not increase in predators relative to their prey.

294. There is no evidence to demonstrate that Siloxane D5 is toxic to any organisms tested up to the limit of solubility in any environmental matrix. The Board is of the opinion that Siloxane D5 will not accumulate to sufficiently great concentrations to cause adverse effects in organisms in air, water, soils, or sediments.

295. Consequently, taking into account the intrinsic properties of Siloxane D5 and all of the available scientific information, the Board concluded that Siloxane D5 does not pose a danger to the environment. Furthermore, the Board concluded that, based on the information before it, the projected future uses of Siloxane D5 will not pose a danger to the environment.

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