Induron Coatings began researching and developing their ceramic epoxy pipe lining, Protecto 401, in 1979. The first lined pipe was installed in 1981 and since then thousands of miles have been lined with Protecto 401. It provides unmatched corrosion protection for ductile iron sewer pipes through its novolac epoxy material. Protecto 401 has been extensively tested by Induron and third parties to ensure it meets strict specifications for application and performance in protecting sewer systems. It is applied at 40 mils thick and tested to confirm uniform thickness and absence of pinholes.