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How is a medium with minor hazard (Category IV) defined?

2021-09-10View Original

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Hello everyone, HG/T 20660-2017 specifies four levels of toxicity hazard. Levels 1 to 3 list all types of media, but there is no specific list for media with mild hazard at level 4 (Level IV). So how is it determined whether a medium falls under Level 4? Does it mean that anything toxic that is not in levels 1 to 3 falls into level 4? Is ethylene a fourth-level compound?

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