The Story of PFAS PFAS (Per- and poly-fluoroalkyl substances) or ‘forever chemicals’ are a class of over 15,000 toxic chemicals. Members of this chemical class feature the strongest chemical bond known to organic chemistry- the carbon fluorine bond. This incredible chemical bond leads to properties like not reacting with other substances- including an ability to repel grease, oil, and water. In this story, chemical manufacturers wanted to give their products these properties, such as jackets that didn’t get wet, refrigerants that didn’t corrode copper pipes, and frying pans that eggs didn’t stick to. PFAS chemicals were added to pizza ...