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In the US there is no requirement, as of 2011, for any particular frequency of revision of MSDS. They must be revised when the information changes.
Canada expects MSDS to be revised not less often than every three years.
Other countries have other requirements.
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∙ 13y ago
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Information about a material's health hazard?
Information about the health hazards of a material will be found on its safety data sheet. They are intended to provide workers and emergency personnel with procedures for handling or working with that substance in a safe manner.
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