Source: https://www.shell.com/business-customers/chemicals/our-products/propylene-glycols/_jcr_content/par/tabbedcontent/tab_372273154/textimage.stream/1576570677727/0d6b9e80eeb6de54d7f09745084804d87b6436d7/tds-mpg-industrial-updated-december-2019.pdf