PMB 25/55 Polymer Modified Bitumen Supplier and Exporter

PMB 25/55 is a medium-hard grade in the Tiger Bitumen range of Polymer Modified Bitumen. Its penetration range is 25 to 55 tenths of a millimetre (0.1 mm) at 25°C. It sits between the harder PMB 10/40 and softer wearing-course grades such as PMB 45/80. As a result, it can offer a balance of stiffness, rutting resistance, cohesion and polymer-enhanced elasticity, depending on the formulation. Engineers may consider this grade for hot-mix asphalt base and binder courses, high-modulus mixtures and stone mastic asphalt where the project specification supports its use.

Key Characteristics and Benefits of PMB 25/55

• Medium-hard, low-penetration binder: Its penetration range of 25–55 (0.1 mm at 25°C) makes it harder than softer PMB grades while generally offering more workability than PMB 10/40.
• Resistance to permanent deformation: Its stiffness can help asphalt resist rutting under heavy, slow-moving traffic and high pavement temperatures when the formulation suits the application.
• Polymer-enhanced cohesion and fatigue resistance: Depending on the polymer system, modification can improve cohesion, elastic recovery and resistance to fatigue cracking compared with the unmodified base binder.
• Versatility across pavement layers: It may suit base and binder courses, high-modulus mixtures and, where permitted by the specification, stone mastic asphalt (SMA) on heavily trafficked sections.
• Mixing and compaction temperatures: PMB grades may require different working temperatures from unmodified bitumen. Therefore, follow the product data sheet and approved asphalt mix design.

Applications of PMB 25/55

• Asphalt concrete base and binder courses for heavily trafficked roads
• High-modulus asphalt mixtures for structural layers
• Stone mastic asphalt (SMA) on sections with slow and heavy traffic, such as intersections, bus lanes and industrial areas
• Asphalt mixtures for hot-climate regions where rutting resistance is a key design requirement
• Mastic asphalt, where the relevant product and project specifications permit its use
• Pavement strengthening and reinforcement layers where the approved mix design requires improved fatigue performance

Selecting PMB 25/55 for Your Project

Engineers may select this grade when a pavement needs stiffness and resistance to rutting but also requires a different balance of workability and flexibility from the hardest grade. For projects where maximum stiffness is the priority, such as certain high-modulus base layers under very heavy loads, PMB 10/40 may warrant consideration.

Conversely, where flexibility at lower temperatures or in thin wearing courses matters more, a softer grade such as PMB 45/80 may be worth evaluating. The project specification, climate, traffic loading and asphalt mix design should determine the final selection. Share your requirements with our team so the applicable product specification can be reviewed.

Tiger Brand Polymer Modified Bitumen PMB 25/55 Specifications

EN 14023 provides a specification framework for polymer-modified bitumen used on roads, airfields and other paved areas. The 25/55 designation identifies the penetration range at 25°C, measured according to EN 1426. However, this range alone does not represent the complete grade designation.

The full designation also includes the applicable minimum Ring and Ball softening-point class, measured according to EN 1427. Examples of designations used for this grade include PMB 25/55-60 and PMB 25/55-65. The applicable designation and required properties depend on the product specification.

Other properties, including cohesion, resistance to hardening, flash point and, where required, Fraass breaking point, elastic recovery and storage stability, depend on the relevant specification and declared product properties. Therefore, confirm the complete grade designation and test values against the product-specific technical data sheet.