May 2012 marks the 25th anniversary of Purafil’s Corrosion Classification Coupons (CCCs) analysis. Originally, CCCs were mainly intended for monitoring control rooms in industrial settings and to this day, over 75% of CCCs analyzed come from industrial facilities that have high levels of corrosive gas exhaust such as paper mills, oil and gas refineries, etc. Since the first coupon analysis, Purafil’s laboratory scientists have analyzed thousands of field- exposed coupons each year, providing comprehensive reports in 10 languages; Purafil reports detail the types of contaminants in the environment and the severity of corrosion in the room as defined by the International Society of Automation (ISA) Standard 71.04-1985, the accepted guideline for warranties of electronic equipment.