Annotation of standard text ASTM ADJD3241 :
Anodized aluminum strips plastic encased plaque (8.0 by 4.0 in.) consisting of 5 colored aluminum strips rated 0, 1, 2, 3, 4. The complete scale is 0, < 1, 1, < 2, 2, < 3, 3, < 4, 4, > 4. These strips are provided for the visual rating of the heater tube produced by Test Method D 3241, Thermal Oxidation Stability of Aviation Turbine Fuels Procedure. The colors of deposits on the heated tube are rated by using a tuberator and the ASTM Color Standard.