HINCOL Bitumen Emulsion & Bituminous Products

Bitumen emulsion is a stable dispersion of bitumen droplets in water, held together by an emulsifying agent (surfactant). Unlike hot bitumen which must be heated to 150–180°C before application, bitumen emulsion is applied at ambient temperature — making road construction dramatically safer, faster, and more environmentally friendly.

HINCOL bitumen emulsions are cationic, meaning the bitumen droplets carry a positive electrical charge. This makes them adhere strongly to negatively-charged aggregates (silica, granite, basalt) commonly used in Indian roads — delivering superior bond strength compared to conventional cutback bitumen.

When emulsion is applied to a road surface, the water phase evaporates and the bitumen droplets coalesce, forming a continuous bitumen film. This process is called “breaking” — and the time it takes determines the type of emulsion (Rapid, Medium, or Slow Setting).

Bitumen emulsions are classified by setting rate — how quickly they break after application. Each type is suited to different applications:

• Rapid Setting (RS) — Break within 5–15 minutes. Used for tack coat, surface dressing, grouting, penetration macadam. HINCOL grades: RS1, RS2, HINTAC, Chip Seal RS2.
• Medium Setting (MS) — Break within 30–60 minutes. Used for premix patching, dense graded premix, OGPC machine mix. HINCOL grades: MS, Premix-M.
• Slow Setting (SS) — Break time over 60 minutes (some up to 24 hours). Used for prime coat, fog seal, slurry seal, soil stabilization, cold mix bituminous concrete. HINCOL grades: SS1, SS2, SS2-Stab, CMBC.

Bitumen emulsion has three components:

1. Bitumen droplets (40–70% of total volume) — the binder that ultimately remains on the road surface
2. Water phase (30–55%) — the carrier medium that evaporates during application
3. Emulsifier (0.5–2%) — the chemical agent that prevents droplets from merging during storage

When bitumen emulsion contacts the road surface and aggregate, the emulsifier’s chemical balance is disrupted. The positively-charged bitumen droplets are attracted to the negatively-charged aggregate surface, water begins to evaporate, and droplets coalesce — forming a continuous bitumen film. This is called “breaking”.

The speed of breaking depends on: emulsifier type, surface characteristics, ambient temperature, humidity, and aggregate composition. HINCOL’s R&D team formulates emulsions to break at precise rates suited to each application.

HINCOL bitumen emulsions are used at every stage of road construction and maintenance:

• Tack Coat — A thin layer of emulsion applied between two pavement layers to ensure proper bonding. Uses RS1 or HINTAC trackless emulsion.
• Prime Coat — A penetrating coat applied on the granular base before laying the asphalt layer. Uses SS1 IS or HINPRIME SS1 ASTM.
• Surface Dressing & Chip Seal — Economical pavement resurfacing — emulsion sprayed and aggregate spread on top. Uses RS2 or Chip Seal RS2.
• Fog Seal & Slurry Seal — Preventive maintenance treatments that restore aged surfaces and seal fine cracks. Uses SS2.
• Cold Mix Bituminous Concrete — Pre-mixed bituminous mix that cures at ambient temperature — used for rural roads, pothole repair, trench reinstatement. Uses CMBC or MS.
• Soil Stabilization & Emulsion Treated Base (ETB) — Strengthening of weak subgrades and granular bases. Uses SS2-Stab.
• Full Depth Reclamation (FDR) — In-situ recycling of existing damaged pavement. Uses SS2-FDR.
• Pothole Repair — Quick patching of road potholes using cold mix products. Uses Road Bond (cold mix) or Roadbond Max (solvent-free).

For most modern road construction applications — especially tack coat, prime coat, surface dressing, and cold mix — bitumen emulsion is the preferred choice. It offers lower cost, lower environmental impact, better worker safety, and equivalent or superior road performance compared to hot bitumen.

• No heating required — Apply at ambient temperature, save fuel, eliminate fire hazards
• Environmentally friendly — Zero solvent emissions, minimal CO₂ footprint vs hot bitumen
• Works in monsoon — Many HINCOL grades bond on cool and damp surfaces — year-round application
• Superior adhesion — Cationic chemistry ensures strong bond with Indian aggregates (silica, granite, basalt)
• Faster construction — No heating delays, immediate application, faster road opening
• Cost effective — Lower binder usage, less labour, reduced equipment cost
• HPCL + COLAS quality — Manufactured by HINCOL — HPCL’s petroleum infrastructure + COLAS’s global road technology
• ISO 9001:2015 certified — Every batch tested in NABL-accredited laboratories before dispatch
• Pan-India supply — 10 manufacturing plants ensure delivery to any project location

HINCOL bitumen emulsions are manufactured to multiple international and Indian standards:

Every batch produced at HINCOL plants is tested in our NABL-accredited laboratories before dispatch. Test certificates are provided with every consignment.

Match your application to the right HINCOL product: