by pressure laminating vacuum laminating extrusion coating flame spraying or any other method suitable for thermoplastic coating thicker coatings which generally provide better protection of the coated metal can be applied without the problems presented by the brittleness of thermoset epoxy resins however coatings as thin as 10 mil 0 25 millimeters have been found entirely suitable 34 coated plaques 34 for testing were prepared in the laboratory as follows 34 treated carbon steel plates 34 were made by first sandblasting and then washing with 1 1 1 trichloroethane and then treating with a solution of u03b3 aminopropyltriethoxysilane in 50 50 ethanol water 0 2 0 4 solution if filler was used it was blended with polymer using a roll mill at a temperature of about 180 u00b0 c until a homogeneous blend was obtained typically about ten minutes polymer mixed with filler if any was made into sheets by compression molding using a hydraulic press at a temperature of about 190 u00b0 c and a pressure of about 2 76 u00d7 10 8 pa to obtain a film of about 10 mil 0 25 the sheet was then laminated to the treated carbon steel plate by either vacuum forming techniques at 190 u00b0 c and a vacuum of 8 94 u00d7 10 4 pa or by pressing the sheets onto the treated carbon steel plate at 160 u00b0 c with minimum pressure for about 3 minutes followed by pressure of 6 9 u00d7 10 6 pa for.