AASHTO M 247-13 (2018) PDF Download

AASHTO M 247-13 (2018) is a standard specification that identifies the requirements for glass beads used in pavement markings. The purpose of this standard is to ensure that the glass beads meet the necessary criteria to create reflectorized pavement markings. These pavement markings rely on the reflective properties of the glass beads to enhance visibility and safety on roadways.

The specification sets out the characteristics that the glass beads must possess in terms of size, shape, specific gravity, refractive index, and roundness. Additionally, it establishes the requirements for color, transparency, and clarity of the glass beads. These parameters aim to guarantee that the glass beads will effectively reflect light and maintain their performance over time.