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Technical Overview of Colored High Friction Surface Treatment (HFST)
Time: 2026-09-14

Technical Overview of Colored High Friction Surface Treatment (HFST): Systems, Materials, and Installation


High Friction Surface Treatment (HFST) is a high-performance, ultra-thin functional overlay designed to dramatically increase roadway micro-texture and macro-texture. By combining tough polymer resin binders with high-hardness colored aggregates, HFST provides clear visual demarcation while significantly increasing the skid resistance (BPN/PSV rating) under wet and icy conditions—reducing braking distances by 30% to 40%.

Internationally, this system is widely deployed on high-risk roadway segments, including sharp horizontal curves, steep grades, interchange ramps, toll plaza approaches, signalized intersections, bus rapid transit (BRT) lanes, and pedestrian crosswalks.



Key Material Systems Used Globally

The HFST system comprises two essential components: an engineered Polymer Resin Binder and Wear-Resistant Aggregates.

Material ComponentInternational Standards / BenchmarksKey Properties & Application Suitability
Two-Component Polyurethane (2K PU)BBA/HAPAS Type 1 certified, ASTM specificationsHigh flexibility, elongation, and impact absorption. Accommodates thermal movement and reflective cracking in flexible asphalt pavements. Delivers UV and weather resistance in regions with extreme temperature swings.
Two-Component Epoxy Resin (2K Epoxy)AASHTO / FHWA HFST standard specificationsSuperior tensile and compressive strength with rigid bonding performance. Requires thoroughly prepared, dry substrates. Extensively specified on rigid concrete bridge decks and heavily trafficked highways.
Methyl Methacrylate (MMA)Cold-weather rapid-setting standard systemsRapid cure profile (opens to traffic within 30–60 minutes) and functional at sub-zero temperatures (down to -10°C). Ideal for high-density corridors, toll gates, and bridges where lane closure windows are tightly restricted.
Calcined Bauxite Aggregate1–3 mm grading; Polished Stone Value PSV ≥ 70The global gold standard for heavy-duty vehicle traffic. Mohs hardness 8.5–9. Retains its angular, sharp micro-texture under continuous heavy truck tire abrasion without polishing. Typically supplied in natural buff/gray or dark brown.
Color-Sintered Ceramic Granules1–2 mm or 2–3 mm grading; through-coloredExcellent color fastness and UV stability. Available in vibrant shades (red, green, blue, yellow) for visual delineation in bus lanes, bicycle pathways, urban intersections, and low-to-medium traffic zones.

Standard Installation Procedure (Cold-Applied Broadcast System)

The standard installation method follows the cold-applied resin broadcast system, yielding a finished profile thickness between 3.0 mm and 4.0 mm:

1. Surface Preparation and Inspection
2. Masking and Perimeter Protection
3. Priming (Substrate-Dependent)
4. Binder Mixing and Application
5. Aggregate Broadcasting
6. Curing and Aggregate Recovery
7. Demasking and Quality Acceptance

  • Strip masking tape along the perimeter, confirm surface friction levels (BPN/PSV testing), and re-open the lane to traffic.

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