Synthetic thermoplastic road marking material consists of a mixture of pigment, glass beads, binder and filler materials. The general composition is as follows. However this will be varied for different grade of materials that is to be produced.
Application
The thermoplastic material shall be melted down in a pre-heated boiler fitted with a mechanical stirrer to prevent overheating and discoloring.
The temperature shall not exceed the manufacturer's specified application temperature of 200 °C for white and 180 °C for yellow. At this temperature the thermoplastic melts into the upper surface of the asphalt forming a thermal bond.
Application is done either by hand-propelled or self-propelled machine.
The surface to be applied shall be free from dirt, dust and other objectionable materials
During application, drop-on glass beads is applied concurrently on to the line. This will provide the line with immediate reflectivity.
Road marking visibility at night can only be achieved by the addition of tiny solid glass beads during the application of thermoplastic line. Maximum reflectivity of individual glass beads occurs when the optimum degree of embedment is achieved. This happens when 60% of the bead is below the surface of the pavement marking materials.
Proper Embedment
Improper Embedment
Optimum retro-reflectivity requires round spheres. Non-round spheres do not reflect light efficiently but scatter it in random direction.
Light returned by true
round spheres
Light scattered by non round spheres
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