Our regular gaskets are made of PVC (poly vinyl chloride) and our heavy duty gaskets are made of Santoprene® (a/k/a Sanaprene®) or Alcryn®.
Cool Seal Gasket Facts: What are your gaskets made of?

Our regular gaskets are made of PVC (poly vinyl chloride) and our heavy duty gaskets are made of Santoprene® (a/k/a Sanaprene®) or Alcryn®.