30/45 is a penetration-grade bitumen. Its suitability depends on the required specification, pavement conditions and asphalt application.

What Do the Numbers 30 and 45 Mean in 30/45 Bitumen?

The numbers in a penetration-grade designation refer to the penetration range measured using a standardized penetration test. The test evaluates how far a standard needle penetrates the bitumen under defined test conditions.

For 30/45 bitumen, the designation indicates that the measured penetration must fall within the range associated with this grade when tested according to the applicable standard. Penetration is traditionally expressed in tenths of a millimetre.

What Are the Main Technical Properties of 30/45 Bitumen?

Penetration is the defining property used in the grade name, but it is not the only characteristic that should be reviewed when evaluating 30/45 bitumen. Product conformity normally involves a broader set of physical and performance-related properties according to the applicable specification.

Depending on the standard, project and supplier documentation, buyers may need to review properties such as softening point, viscosity, ductility or related deformation characteristics, flash point, solubility and changes after aging.

Which Tests Are Used to Evaluate 30/45 Bitumen?

Quality control for penetration-grade bitumen involves laboratory testing to confirm that the supplied binder complies with the required specification. The exact testing program depends on the governing standard and contract requirements.

For a broader explanation of common laboratory tests used in bitumen quality evaluation, see Dejpa’s guide to bitumen quality control tests .

Where Is 30/45 Bitumen Used?

30/45 bitumen can be specified as a paving binder for asphalt production and road construction where the pavement design and applicable specification call for a relatively hard conventional penetration grade.

Its actual suitability depends on the asphalt mixture, climate, loading conditions, pavement layer and project requirements. For this reason, the grade should not be assigned to a particular road type solely on the basis of its penetration range.

Is 30/45 Bitumen Suitable for Hot Climates?

Because 30/45 is a relatively hard penetration grade, it may be considered in projects where a harder conventional binder is required. However, describing it simply as a “hot-climate bitumen” would be an oversimplification.

Binder selection should consider pavement temperature, traffic loading, asphalt mixture design, project specifications and the grading system required by the relevant authority. Where performance-based specifications are used, a PG binder requirement may be more appropriate than selecting a product only by penetration grade.

Is 30/45 Bitumen Suitable for Heavy Traffic?

A harder penetration grade may be considered in some heavily loaded pavement applications, but penetration grade alone is not enough to determine suitability for heavy traffic.

Axle loading, traffic volume, vehicle speed, pavement temperature, asphalt mix design and the applicable specification all influence binder requirements. Projects with demanding traffic or temperature conditions may also require performance-graded or modified binders.

How Does 30/45 Bitumen Compare with 40/50 and 60/70?

30/45, 40/50 and 60/70 are all penetration-grade bitumens, but they represent different consistency ranges. In general, a lower penetration range corresponds to a harder conventional binder, while a higher range indicates a softer binder under the specified penetration test conditions.

This means 30/45 is generally harder than 40/50, and both are generally harder than 60/70. However, this does not mean that 30/45 is automatically the best choice. Each grade is intended for projects whose specifications and service conditions match its required properties.

30/45 vs 40/50 Bitumen: What Is the Difference?

The main difference between 30/45 and 40/50 lies in their penetration ranges. 30/45 represents a relatively harder binder, while 40/50 falls into a slightly softer penetration range.

In practice, the choice between these grades should follow the project specification rather than a simple preference for a harder or softer product. Climate, pavement temperature, asphalt mixture design and loading conditions all remain important.

30/45 vs 60/70 Bitumen: What Is the Difference?

The difference between 30/45 and 60/70 is more pronounced in terms of penetration consistency. 30/45 is generally harder, while 60/70 is a softer conventional penetration grade.

This does not mean that one grade should replace the other. 60/70 is widely specified for many paving applications, while 30/45 may be required where the technical specification calls for a harder penetration-grade binder. The governing standard and project design should determine the correct choice.

For more information about 60/70 bitumen, see Dejpa’s guide to Bitumen 60/70 .

How Should Buyers Choose Between 30/45, 40/50 and 60/70?

The correct grade should be selected from the project specification and technical requirements rather than from the grade number alone. A lower penetration range does not automatically indicate a superior product, just as a softer grade is not automatically less suitable.

What Is the Difference Between 30/45 Bitumen and PG Bitumen?

30/45 and PG grades belong to different classification systems. 30/45 is a penetration grade, while Performance Grade (PG) bitumen is classified according to performance-related requirements associated with pavement temperatures and laboratory testing.

A penetration grade should therefore not be directly converted into a PG grade using a simple one-to-one rule. The two systems evaluate and classify binders differently.

For a detailed explanation of the Performance Grade system, see Dejpa’s PG bitumen guide .

Can 30/45 Bitumen Replace a PG Binder?

Not automatically. If a project specification requires a particular PG binder, supplying a penetration-grade product only because it appears to have similar consistency would not demonstrate compliance with the required PG specification.

The binder must meet the grading system and test requirements stated in the project documents. Any substitution should therefore be evaluated and approved according to the relevant engineering and contractual requirements.

Why Is the Certificate of Analysis Important for 30/45 Bitumen?

The grade name alone does not provide all the information needed to evaluate a shipment. A Certificate of Analysis can help buyers review the measured test results against the agreed technical specification.

Depending on the specification, the COA may include results related to penetration and other required properties. Buyers should compare the reported values with the applicable limits rather than relying only on the product label.

For practical guidance, see Dejpa’s guide to reading a Bitumen Certificate of Analysis .

What Should Buyers Check Before Ordering 30/45 Bitumen?

Before placing an order, buyers should confirm that 30/45 is actually the grade required by the project and that the applicable standard and quality requirements are clearly defined.

What Information Should Buyers Include in a 30/45 Bitumen RFQ?

A complete request for quotation should give the supplier enough information to confirm the technical requirement, supply format and commercial basis of the inquiry. Simply stating “30/45 bitumen” may not be enough for an accurate quotation.

What Are Common Mistakes When Buying 30/45 Bitumen?

Most procurement mistakes do not come from the grade name itself, but from incomplete technical information or assumptions about how one penetration grade compares with another.

Frequently Asked Questions About 30/45 Bitumen

What does 30/45 mean in bitumen?

30/45 identifies a penetration-grade bitumen. The numbers refer to the penetration range measured under the applicable standardized test conditions.

Is 30/45 bitumen harder than 60/70?

Yes, in terms of penetration consistency, 30/45 is generally a harder conventional penetration grade than 60/70 because it has a lower penetration range.

Is 30/45 bitumen harder than 40/50?

Generally, yes. 30/45 has a lower penetration range and is therefore classified as a relatively harder penetration grade than 40/50 under the specified test conditions.

Is 30/45 bitumen suitable for hot weather?

It may be specified in some projects requiring a relatively hard conventional binder, but climate alone is not enough to confirm suitability. Pavement temperature, traffic, asphalt mix design and the applicable specification must also be considered.

Can 30/45 bitumen be used for heavy traffic?

Potentially, if the project specification requires this grade. However, heavy traffic cannot be evaluated from penetration grade alone. Loading, speed, temperature, pavement structure and performance requirements must also be reviewed.

Is 30/45 the same as PG bitumen?

No. 30/45 belongs to the penetration grading system, while PG bitumen is classified using a performance-based grading system associated with pavement temperatures and additional laboratory requirements.

Can 30/45 be directly converted to a PG grade?

No simple one-to-one conversion should be assumed. Penetration grading and Performance Grading use different classification approaches and test requirements.

What documents should a buyer request for 30/45 bitumen?

Depending on the project and contract, buyers may request the relevant TDS, Certificate of Analysis, test results, inspection documents and other technical documentation required by the specification.

Final Considerations

30/45 bitumen is a relatively hard conventional penetration-grade binder defined by its penetration range under standardized test conditions. It can be used in asphalt and paving applications where the project specification requires this grade.

Its lower penetration range makes it generally harder than 40/50 and 60/70, but this should not be interpreted as meaning that 30/45 is inherently better. Each grade serves different project conditions and technical requirements.

For procurement, the correct approach is to confirm the applicable standard, review the required test properties, compare the TDS or COA with the project limits, and specify quantity, packaging, destination and documentation requirements clearly in the RFQ.