Polymer Modified Bitumen

PMB Bitumen is one of Aras Petrochemical Company Bitumen products with 25 years experience of producing and exporting to all over the world.

Polymer Modified Bitumen (PMB) is a type of bitumen (asphalt) that has been enhanced with polymers to improve its performance characteristics. It is widely used in road construction, roofing, and other waterproofing applications due to its superior properties compared to conventional bitumen.

What Is Polymer Modified Bitumen?

PMB = Base Bitumen + Polymers + Additives

Base Bitumen: Acts as the primary binder.

Polymers: Improve elasticity, strength, and resistance to deformation.

Common polymers used:

SBS (Styrene-Butadiene-Styrene) – a thermoplastic elastomer that gives elasticity and strength.

APP (Atactic Polypropylene) – a thermoplastic polymer that improves heat resistance.

Additives: May include anti-stripping agents, plasticizers, or stabilizers to enhance performance.

Properties of PMB

Property                                                          Benefit

Improved Elasticity                                      Better recovery after deformation

Higher Softening Point                                Resists rutting and bleeding in heat

Lower Temperature Flexibility                   Withstands cracking in cold weather

Enhanced Adhesion                                      Better bonding with aggregates

Fatigue Resistance                                         Extends pavement life under traffic

Applications

Road Pavements

Highways

Urban roads

Bridges & flyovers

Airports (runways and taxiways)

Roofing Materials

PMB membranes for waterproofing

Durable roofing sheets

Waterproofing

Basements

Tunnels

Foundations

Manufacturing Process

Heating the base bitumen to a workable temperature.

Blending the polymer into the hot bitumen using high shear mixers.

Stabilization with additives to ensure consistent performance.

Storage and transport under controlled temperatures.

Advantages Over Conventional Bitumen

Longer pavement life

Reduced maintenance costs

Better performance in extreme temperatures

Resistance to rutting, fatigue, and thermal cracking

Considerations

Cost: Higher initial cost than regular bitumen

Handling: Requires specialized equipment and temperature control

Compatibility: Not all bitumen types are compatible with all polymers