Welcome to Techlines...February 2008

ColorGard

This series of coatings is designed to be applied in very thin films. Unique ingredients impart the high temperature characteristics that exceed the typical operating limits for coatings using resins from this family of chemicals. It is extremely important to avoid thick films. If the coating is applied in a thick film certain of the ingredients will migrate away from the surface. The result is a soft surface, even after curing and a lowered temperature capability. To avoid this problem make sure to use a spray gun with a 1mm or smaller nozzle and apply with about 30PSI at the gun. Apply as a thin, wet coat and allow drying before overlapping. Overlapping is not a problem unless the application is wet on wet, then the potential for the film to be built up too thick, can occur. Minor overlapping is not of concern such as can occur when spraying adjacent tubes on a header. For a slightly glossier appearance allow the base coat to full dry before applying a coat of CGCC (ColorGard Clear).

The maximum base metal temperature or exhaust gas temperature a specific color in the series can handle will be dependant on the coloring pigments used. Aluminum colored systems will have a temperature capability of approximately 1300F base metal or 1600F Exhaust Gas temperature.

Exhaust Gas Temperatures

Normal exhaust gas temperatures (EGT) typically run in the 1000F to 1350F range. In Turbo Charged engines or in many Race engines the EGT can be even higher. EGT’s in the 1800F to 2000F plus range are becoming common, particularly in Turbo Charged engines running high boost.

When choosing an exhaust coating the expected EGT must be considered. Any coating containing aluminum will be usable in the normal EGT range and with specific base coats may handle an EGT to 1800F. For an application where the EGT exceeds this temperature it is recommended that a our BHK or Turbo X be utilized over a base coat of HHBK. If the base metal temperature exceeds 2000F it can lead to a failure of the coating.

High Temperature coatings are rated based on their ability to maintain adhesion. The corrosion protection offered by any coating will vary depending on the temperature expected to be seen in operation and the level of protection will vary depending on the formula. In normal applications Cermakrome either as a single coat or as a base coat, offers the best corrosion protection. Applying Cermakrome over a base coat of MCS will raise the maximum EGT that Cermakrome can experience without failure. If temperatures are expected to run in the 1800F range and above, it is recommended that Stainless Steel be used in the construction of the tubing. This reduces the concern regarding corrosion if a high quality Stainless is used. Cast Iron handles higher EGT’s without the problems.

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Send e-mail to the editor: Leonard Warren

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