Sripath ButaPhalt for PMB: bonding performance and mix design notes for engineers
Reviewed by Joe Ashwell

First reported on Roads & Infrastructure (AU)
30 Second Briefing
Sripath has launched ButaPhalt, a new polymer additive for polymer modified bitumen (PMB) blends designed to address long‑standing bonding and durability issues in road surfacings. The formulation is engineered to increase crosslinking connectivity within the binder matrix, improving cohesion between bitumen, polymer and aggregate while also boosting plant production efficiency. For pavement designers and asphalt producers, this signals potential for longer‑life wearing courses, better resistance to rutting and cracking, and fewer processing constraints when specifying high‑performance PMB mixes.
Technical Brief
- ButaPhalt is supplied as a pelletised additive, allowing easy dosing into existing asphalt plants.
- The additive is formulated to be compatible with a wide range of PMB chemistries already in use.
- Sripath draws on field performance data from multiple continents to calibrate ButaPhalt’s binder–aggregate interaction.
- The product targets legacy failures where PMB layers debond from underlying conventional asphalt or sprayed seals.
- Application focus is high-stress surfacings on freight routes, intersections and heavy commercial vehicle corridors.
- Sripath positions ButaPhalt for both dense-graded asphalt and open-graded friction courses in highway works.
- The company is marketing the additive to road agencies and asphalt producers as a retrofit to existing PMB specifications.
- Wider adoption could influence future PMB performance clauses in national road authority specifications and tender documents.
Our Take
Within the 14 Materials stories in our database, Australia-focused pieces often emphasise performance-based road specifications, so any Sripath product gaining traction there will likely need to demonstrate measurable lifecycle or maintenance benefits rather than just upfront cost savings.
Among the 175 Product-tagged items, bitumen and asphalt additives aimed at lowering mix temperatures or improving recyclability have been prominent, suggesting that if Sripath is targeting Australian roads it will be judged against competing modifiers on sustainability metrics as much as on mechanical performance.
For suppliers like Sripath entering or expanding in Australia, state-by-state procurement and specification differences can be decisive, with past Materials coverage indicating that early adoption in one jurisdiction (e.g. a trial by a single road authority) often acts as the gateway to broader national uptake.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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