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Sripath PGXpand, a specially-engineered innovative polymer, vetted and evaluated by RMIT

The RMIT team has conducted a comprehensive evaluation of PGXpand against Australian A35P specification.

Sripath Asia-Pac, located in Melbourne, an affiliate of Sripath Technologies LLC located in New Jersey USA, has announced that the Royal Melbourne Institute of Technology (RMIT) has completed the testing and evaluation of PGXpand, a specially-engineered innovative polymer marketed by Sripath.

“The RMIT team has conducted a comprehensive evaluation of PGXpand against Australian A35P specification. All other raw materials used for this study were locally sourced materials commonly used by the industry in Australia,” Associate Professor Filippo Giustozzi at RMIT’s Civil and Infrastructure Department said.

PGXpand enhances the high temperature properties of bitumen without impacting the low temperature properties. It is a highly bitumen-compatible plastomeric polymer.

“PGXpand has been specifically designed to interact with bitumen in a very unique and innovative manner, allowing the product to deliver outstanding roadway performance, even though it does not confer any significant elastic recovery properties to the bitumen,” said Krishna Srinivasan, President of Sripath Technologies.

PGXpand polymer easily melts into bitumen. It mixes into bitumen using low shear mixers, lowering mixing temperatures and shortening mixing times. It is easy to incorporate into a mix plant and exhibits excellent storage stability. PGXpand is highly dosage efficient, it lowers the viscosity of bitumen and aids in lowering the paving temperature. It helps lower energy consumption and reduces overall costs.

The polymer interacts with bitumen in a unique fashion and tends to provide exceptional properties to the PGXpand Modified Bitumen hot mixes. It improves the key performance qualities of Bitumen, such as, softening point, penetration, and true high grade.

Deepak Madan, Chief Marketing and Business Development Officer of Sripath emphasised that “PGXpand lowers viscosity of the PMB mix, improves its workability and makes the mix easier to compact. It delivers roadways with outstanding rutting resistance, fatigue properties and long-term durability.”

For Hybrid PMB systems, PGXpand is highly compatible with elastomeric polymers. It allows engineers to design mixes with lower levels of elastomeric polymers while delivering better or equivalent roadway properties. Hybrid PMB mixes made using PGXpand have lower viscosity, better workability, and are significantly easier to manufacture and pave.  At the same time, they deliver excellent rutting properties, fatigue performance, and roadway durability.

Bitumen modified with PGXpand can also be used in hot spray seal applications on roadways, allowing for improved workability and better performance. PGXpand Modified Emulsions are used for repair and maintenance applications in the paving industry to deliver long-term durability and reduce frequency of road repairs.

“Sripath’s PGXpand has been tested, evaluated, and vetted by leading experts in academia, industry and transportation agencies from around the world. It has been trusted and effectively used on roadways across the globe since 2015,” remarked Ravi Rajagopalan, General Manager of Sripath Asia-Pac.

For a copy of the report summarising the RMIT results, further details on PGXpand or information on other Sripath products, please visit or contact


About Sripath Technologies & Sripath Asia-Pac

Sripath Technologies develops, manufactures and markets innovative additives, such as, rejuvenators, oils, and polymers to enhance performance of bitumen for paving and roofing applications. ​ Established in 2006, Sripath’s team of industry veterans have a track record for cutting edge innovation and an excellent suite of products and sustainable solutions. ​Sripath Asia-Pac markets Sripath products in Australia, New Zealand and the Asia-Pacific region.

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