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  1. Propylene glycol - Wikipedia

  2. Propylene Glycol - NIST Chemistry WebBook

  3. Propylene Glycol - NIST Chemistry WebBook

  4. Propylene glycol | Description, Formula, Production, & Uses

  5. Propylene Glycol | C3H8O2 | CID 1030 - PubChem

  6. Propylene Glycol - Properties - Matmake

  7. Liquids and Gases - Boiling Points - The Engineering ToolBox

  8. PROPYLENE GLYCOL | CAMEO Chemicals | NOAA

  9. PROPYLENE GLYCOL | OSHA.gov - Occupational Safety and Health Administration