Product labels and an MSDS include terminology that you might be unfamiliar with. Here are four terms you should clearly understand. Permissible Exposure Limit (PEL). This is a daily exposure limit that OSHA considers to be safe. You can’t aggregate or average exposure times; if you go over the PEL on any given day, that’s a reportable event. Threshold Limit Value (TLV). This is similar to the PEL. But instead of being set by OSHA, it’s set by the American Conference of ...

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