4 In. Retroreflective Ceramic Marker

The Apex Retroreflective Ceramic Markers are engineered to offer a dual benefit, providing outstanding visibility both during the night and in broad daylight. These markers are designed to meet the highest standards for road safety and visibility.

Key Features:

  • Day and Night Visibility: These markers harness the power of retroreflection technology to ensure brilliant nighttime visibility, enhancing road safety in low-light conditions.
  • Self-Cleaning Glazed Surface: The markers feature a self-cleaning glazed surface, which not only keeps them looking clean and clear but also ensures exceptional visibility during daylight hours.
  • Convex Design: Each marker boasts a gently curved, convex top surface, ensuring an optimal change in curvature for seamless integration into road surfaces.
  • Impeccable Finish: The top, bottom, and sides of the markers are free of any unsightly marks or discoloration that may compromise adhesion or appearance.
  • Enhanced Bonding: The bottom of the markers features strategically placed protrusions and indentations, increasing the adhesive’s bonding surface area. The bottom surface remains flat within strict tolerance, with protrusions projecting approximately 0.04 inch.
  • High-Quality Material: These markers are crafted from a heat-fired, vitreous ceramic base and possess an opaque, glazed surface that meets specified requirements. The markers are produced from a blend of meticulously mixed clays, shales, talcs, flints, feldspars, and other inorganic materials to ensure desired properties.
  • Uniform and Defect-Free: Each marker undergoes thorough and consistent maturation to guarantee uniformity and freedom from defects that could impact appearance or functionality.
  • Stringent Testing: The markers conform to the rigorous testing requirements outlined in California Test 669.


  • Bond: 1700 osi minimum
  • Glaze Thickness: 0.007″ minimum
  • Hardness: t6 minimum
  • Yellowness Index (Type A, white markers)
  • Color: Yellow (Type AY, yellow markers only)