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You will find free MSDS's here for chemicals, like acetone, methanol, benzene, toluene, on our Right-to-Know fact sheet page and you will find the Worker Right-to-know regulations here. You may also search the CDC here for generic compound-specific data sheets:
For commercial product MSDS's - if you have a commercial product or formulation, rather than a simple, single chemical compound click this link for the products Material Safety Data Sheets, listed by manufacturer!
Click here for household products master list
And if you are not a scientist, and are looking for general information about the safety of a common household product, you might want to try this search engine, Scorecard , rather than the list below.