What Is Hybrid PMB (Polymer Modified Bitumen)? – Iran Bitumen Supply │ IBITMCO
Hybrid PMB is an advanced form of Polymer Modified Bitumen created by blending paving‑grade bitumen with a combination of elastomeric and plastomeric polymers. This dual‑polymer system allows Hybrid PMB to deliver the best performance characteristics of both SBS‑modified (elastomeric) and EVA/PE‑modified (plastomeric) binders. At Iran Bitumen Supply │ IBITMCO, Hybrid PMB is engineered for road networks that require both high elasticity and high stiffness — a balance that neither elastomeric nor plastomeric PMB can achieve alone. The elastomeric component provides flexibility, crack resistance, and excellent recovery, while the plastomeric component enhances rutting resistance, high‑temperature stability, and structural strength. This makes Hybrid PMB ideal for regions with mixed climate conditions, high‑stress pavement zones, and infrastructure exposed to both heavy traffic and temperature variations. Hybrid PMB is typically produced in the same standardized grades used for PMB products: PMB 40, PMB 70, PMB 120.
These grades indicate the binder’s stiffness and performance characteristics:
- ✔ PMB 40 – High stiffness, ideal for hot climates and heavy traffic
- ✔ PMB 70 – Balanced performance for moderate climates
- ✔ PMB 120 – Higher flexibility for cold climates or fatigue‑critical applications
Hybrid PMB is most commonly produced as PMB 70, because this grade benefits most from the combined polymer system — but PMB 40 and PMB 120 are also used depending on climate and project requirements.
Description of Hybrid PMB – Iran Bitumen Supply │ IBITMCO
Hybrid PMB is designed to outperform conventional PMB in environments where pavements must resist both deformation and cracking. By combining elastomeric polymers (such as SBS) with plastomeric polymers (such as EVA or PE), Hybrid PMB forms a complex polymer network that enhances elasticity, stiffness, and long‑term durability. This dual‑modification approach allows Hybrid PMB to maintain flexibility in cooler temperatures while resisting rutting and shoving in hot climates. It also improves fatigue life, adhesion to aggregates, and resistance to moisture damage. As a result, Hybrid PMB is widely used in high‑performance asphalt mixes, highways, urban intersections, bridge decks, and industrial pavements.
Applications of Hybrid PMB
Hybrid PMB is ideal for pavements exposed to mixed climate conditions, heavy axle loads, and high shear stress. It is commonly used in the construction of expressways, national highways, and urban roads where braking, turning, and acceleration forces are concentrated. Its balanced performance makes it suitable for bridge decks, airport taxiways, roundabouts, and steep gradients, where asphalt must resist both cracking and deformation. Hybrid PMB is also used in waterproofing membranes, roofing systems, and industrial coatings due to its excellent adhesion and resistance to aging.
Properties of Hybrid PMB
Hybrid PMB combines the strengths of elastomeric and plastomeric modification. It offers high elastic recovery, improved flexibility, and excellent resistance to cracking, while also providing superior stiffness, rutting resistance, and high‑temperature stability. Its softening point is higher than conventional bitumen, ensuring stability in warm climates, while its enhanced elasticity prevents cracking in cooler temperatures. Hybrid PMB also exhibits improved resistance to oxidation, UV exposure, and fatigue, making it ideal for long‑life pavement applications.
Packing Options for Hybrid PMB
At Iran Bitumen Supply │ IBITMCO, Hybrid PMB is available in New steel drums, Bitubags, Bulk shipments via bitumen carriers, Tanker trucks for direct delivery to asphalt plants. These packaging options ensure efficient handling and continuous supply for large‑scale infrastructure projects.
Difference Between Hybrid PMB, Elastomeric PMB, and Plastomeric PMB
Elastomeric PMB (SBS‑Modified)
- ✔ Highly elastic and flexible
- ✔ Excellent crack resistance
- ✔ Best for cold climates and high‑stress intersections
- ✔ Recovers shape after deformation
Plastomeric PMB (EVA/PE‑Modified)
- ✔ Stiffer and more rigid
- ✔ Superior rutting resistance
- ✔ Best for hot climates and heavy‑load pavements
- ✔ Does not recover shape like elastomeric PMB
Hybrid PMB (SBS + EVA/PE Combined)
- ✔ Combines elasticity + stiffness
- ✔ Balanced performance in mixed climates
- ✔ Excellent rutting resistance AND crack resistance
- ✔ Ideal for highways, bridge decks, and industrial pavements
- ✔ Longer lifespan and improved fatigue resistance
In short:
- ✔ Elastomeric PMB = flexibility
- ✔ Plastomeric PMB = stiffness
- ✔ Hybrid PMB = both flexibility and stiffness together
Specification of Polymer Modified Bitumen