CAS Number: 109-99-9. A flammable liquid ether that is derived from furan and used as a solvent and as an intermediate in organic synthesis. Chemical formula = C4H8O. Molecular weight = 72.1 g/mol.

Solvent used for many plastics including vinyl.

A solvent welding solution.

Irritant to eyes and mucous membranes. Neurotoxic. Can cause injury to liver and kidneys. Used in some adhesive products.

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