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Russian to English translations [PRO] Tech/Engineering - Manufacturing
Russian term or phrase:р.з.
наименование, номера CAS и ЕС (при наличии), массовая доля, ПДК р.з. или ОБУВ р.з., классы опасности, ссылки на источники данных
Actually, I only need to know what the r.z. stands for. PDK is Maximum Permitted Level and OBUV is Safe Reference Levels of Impact. At least I think so. But I can't understand what RZ might represent. This is a description of a chemical product.