Developed in line with Transport for Scotland Methodology, this low void, high bitumen content Stone Mastic Asphalt designed product is ideal for sites where safety and reduced noise are paramount but also where a whole life cost saving is required through the use of more durable products.

Compared to traditional asphalt surfacing, Tufflex® D offers texture, high deformation resistance and a very low air void content. The solution also delivers Highways England’s highest level of wheel rut resistance, level three. Tufflex® D’s design uses specialised binders and incorporates best-in-class polymer technology. With its optimum surface texture of approximately 1.1mm and designed low voids, it effectively protects the surface it covers from water ingress.

Available in 6mm, 10mm and 14mm nominal sizes, Tufflex® D can be laid between 25mm and 50mm thick using a traditional asphalt paver with a 6-10 tonne roller. Special attention should be given to compaction at the joints, which should ideally  be from hot matching by “en echelon” paving or by being cut and painted with a bituminous joint paint, to maintain resistance to the tensile stresses of turning  vehicles. Installation should be strictly in accordance with BS 594987. To enhance  early life skid resistance, it is advisable to apply 1-4mm grit or coated grit on the  
first pass of the roller with a dedicated attached grit box.



  • A best-in-class flexible Polymer Modified Binder (PMB)
  • Suitable for any class of road network
  • Cost-effective over the whole life
  • Quick installation
  • Prevents water ingress
  • Highly sustainable and durable, and offers improved performance over conventional asphalt materials
  • Increased stiffness



  • Trunk roads

  • Urban roads
  • Local Authority Network


Tufflex® D technical data

Material property Test specification Typical results
Design void content BS EN 12697-6 Vmin 1.0% – Vmax 5.0%
Binder drainage BS EN 12697-18 Beaker Method < 0.3%
Water sensitivity BS EN 12697-12 Method A (ITSR) BS EN 12697-23 ≥ 80%
RTPD (wheel tracking) BS EN 12697-22 Procedure B WTS in Air ≤ 1.0mm/103