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67 substances were nominated as "endocrine disruptors" by the Environmental Agency in May 1998. The substances include phthalic acid plasticizer, that is used as plasticizer (ex DOP DBP DEP DCHP BBP) for rubber and is obtained at low cost, and DOP is frequently used.
As the "rubber development & adoption for countermeasure of Endocrine Disruptors" contains no plasticizer similar to endocrine disruptor, the water drained from washing the mats has no toxic effects in the environments.
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