Global Bitumen Standardizing Bodies
The quality and performance of petroleum bitumen are determined through internationally recognized standards and grading systems. Different regions apply specific specifications to ensure consistency, safety, and suitability for various paving and industrial applications.
The most widely recognized bitumen standards are developed and published by the following organizations
European Standards (CEN – European Committee for Standardization)
European countries commonly follow harmonized standards issued by the European Committee for Standardization (CEN), including
DIN EN – German Standards
NF EN – French Standards
BS EN – British Standards
These standards provide unified technical requirements for bitumen products across Europe.
American Standards
In North America, bitumen specifications are primarily regulated by
ASTM – American Society for Testing and Materials
AASHTO – American Association of State Highway and Transportation Officials
These organizations establish detailed testing and grading methods for paving and performance-grade binders.
Other International Standards
Several countries and regions maintain their own recognized systems, including
SABS – South African Bureau of Standards
AS – Standards Australia
IS – Indian Standards
These standards ensure bitumen products comply with local climatic and infrastructure requirements.
Most Commonly Used Bitumen Specifications
Bitumen binders are classified according to their physical and performance characteristics. The most commonly used specifications are outlined below.
Standard Petroleum Bitumen Grades
Conventional paving bitumen is generally classified based on penetration, viscosity, or performance grading systems.
Common specifications include
| Standard | Grading Method |
|---|---|
| ASTM D946 / AASHTO M20 | Penetration at 25°C |
| ASTM D3381 / AASHTO M226 | Viscosity at 60°C |
| ASTM D6373 / AASHTO M320 | Performance Grade (PG) Binder |
| EN 12591 | Penetration Graded Bitumen |
| AS 2008 | Viscosity Grading |
| SABS 307 | Penetration and Viscosity after RTFOT |
| IS 73 (India) | Viscosity Grade (VG) System |
India revised its grading system in 2006, moving from penetration grades to viscosity grading (VG), although CRMB modified binders are still classified based on penetration.
Polymer Modified Bitumen (PMB)
Polymer Modified Bitumen is engineered to provide enhanced elasticity, durability, rutting resistance, and improved performance under extreme traffic and temperature conditions.
Key specifications include
ASTM D5976
ASTM D5840
ASTM D5841
ASTM D6373
AASHTO M320
EN 14023
Austroads Framework Specifications
While certain ASTM polymer classifications are no longer commonly used in the United States, they continue to be applied in some developing markets.
Bitumen Emulsions
Bitumen emulsions are widely used in road maintenance, tack coats, slurry seals, and cold-mix applications. These products may be
Anionic
Cationic
Polymer Modified
Unmodified
Major specifications include
USA Standards
Anionic Emulsions
ASTM D977
AASHTO M140
Cationic Emulsions
ASTM D2397
AASHTO M208
AASHTO M316 (Polymer Modified)
European Standards
European emulsion products are generally regulated under
EN 13808
This harmonized framework covers both cationic unmodified and polymer modified emulsions, supported by various national annexes.
Because emulsion technology varies significantly worldwide, specification systems can differ considerably between countries.
Cutback Bitumen
Cutback bitumen is produced by blending bitumen with petroleum solvents to reduce viscosity and improve workability at lower temperatures.
International specifications include
ASTM Standards
ASTM D2026 – Slow Curing (SC)
ASTM D2027 – Medium Curing (MC)
ASTM D2028 – Rapid Curing (RC)
AASHTO Standards
AASHTO M81 – Rapid Curing
AASHTO M82 – Medium Curing
European Standard
EN 15522 – Cutback and Fluxed Bituminous Binder
Penetration Grade Bitumen
Penetration Grade Bitumen is one of the most widely used paving-grade bitumen products in road construction and asphalt manufacturing. It plays a critical role in binding aggregates and creating durable, cohesive, and stable asphalt mixtures.
This type of bitumen is primarily used in
Hot Mix Asphalt (HMA)
Base courses
Wearing courses
Road paving and infrastructure projects
Penetration grading is determined through penetration and softening point testing, with product designation based mainly on penetration range.
One of the defining characteristics of penetration grade bitumen is its thermoplastic behavior. The material softens at elevated temperatures and hardens at lower temperatures, making temperature–viscosity relationships essential when evaluating