PRECISE APPLICATION MEANS LONG LIFE FOR THERMOPLASTICS

Studies suggest that the problem with thermoplastics is usually traceable to the application process. A 1987 report, "The Evaluation of Pavement Marking Tapes and Thermoplstics," states that thermoplastic markings used in long line conditions provide acceptable reflectivity for up to 8 years. It also notes that in-service tests of thermoplastic markings show that white materials provide 6 to 8 years of service and yellow materials provide approximately 5 years of service according to reflectivity. Used properly, thermoplastics should last more than 5 years and provide reflectance of at least 130 millicandelas. Incorrect blend of ingredients can result in application which fail to perform as desired. Temperature to which thermoplastics are heated and the time for which they are heated also determine performance. Road surface conditions, as well as application methods also determine durability. A check list of problem areas is provided.