LYNGBY, Denmark — A fast-drying, alkylamine-cured epoxy paint, Hempaprime CUI 275 from Hempel helps to combat corrosion under insulation. With extremely short overcoating intervals and a wide temperature resistance, Hempaprime CUI 275 is designed to increase productivity and improve corrosion protection at energy generation and oil and gas facilities.

The company reports that during tests, Hempaprime CUI 275 has shown significantly higher crack resistance at high temperatures than traditional epoxy phenolic coatings, which reduces the risk of cracking and premature failure during service. It is also reportedly extremely fast-drying, which increases applicator productivity. Zechariah Lim, Product Manager at Hempel, said, “Insulated pipework and equipment can be exposed to temperature fluctuations and harsh wet/dry cycling, which makes specifying for CUI service challenging. Hempaprime CUI 275 is suitable for use in a wide range of temperatures from cryogenic up to 275 °C and has excellent crack resistance under cycling. This makes specification simpler and ensures a more reliable performance in service.” He continued, “Importantly, Hempaprime CUI 275 also has a very short overcoating interval – just 90 minutes at 20 °C. As a result, applicators can coat more sections in one shift, increasing productivity in fabrication situations and reducing the time needed to re-insulate equipment during maintenance work. This can lead to significant cost savings for customers.”

Hempaprime CUI 275 meets the ISO 19277: 2018 standard for categories CUI-1, CUI-2, CUI-3 and all cryogenic equivalents. 

Other benefits include:

  • A long-lasting barrier protection in severe corrosive environments, high temperatures and wet conditions beneath thermal insulation;
  • A short overcoating interval (90 minutes at 20 °C (68 °F) to increase productivity during application;
  • Wide temperature resistance from cryogenic up to 275 °C (527 °F) to simplify specification;
  • Excellent crack resistance compared to traditional epoxy phenolic coatings;
  • Wide application temperature range, down to -10 °C (14 °F), reducing heating costs during in-shop application and extending the maintenance season in cold climates; and
  • Application on hot surfaces up to 204 °C (399 °F) to minimize disruption and shutdown during maintenance. 

Learn more about Hempaprime CUI 275 here