Bitumen PG 58-16 — Production, Specification & Applications
PG 58-16 covers a 74-degree span positioned toward the cold end, specified because the winter minimum sits near minus 16 degrees and the summer does not warrant more.
Where PG 58-16 sits on the temperature scale
Performance grading ties the binder to the climate of the road rather than to a refinery output slate. The shaded band is the range PG 58-16 is certified to serve, a useful span of 74 degrees.
What distinguishes PG 58-16
The upper requirement of 58 °C is modest, which means this grade is rarely specified for its rutting resistance. The controlling measurements are the bending beam results at minus 6 °C.
What buyers should know
Creep stiffness governs how much tensile stress builds as the pavement contracts, and the m-value governs how quickly that stress relaxes. A binder can pass the stiffness limit and still fail on m-value, which is the more common of the two failures in practice.
How Bitumen PG 58-16 is produced
Understanding the refining route explains why some grades are readily available and others are not, and why two binders that look similar on a datasheet can behave differently in service.
From crude oil to vacuum residue
Production follows the standard route of atmospheric then vacuum distillation, with the vacuum cut taken at a moderate depth. A 58 °C upper grade does not demand a stiff residue, so the cut is shallower than for the 64-series, leaving a higher maltene content that also assists the cold-temperature performance the grade is chosen for.
Reaching the PG 58-16 envelope
Because both ends of the envelope are comparatively relaxed — a modest 58 °C upper requirement and a minus 6 °C bending beam temperature — PG 58-16 is one of the more straightforward grades to produce straight-run. Modification is rarely necessary. The main production consideration is consistency between parcels, since a shallower cut is more sensitive to variation in the crude slate.
Production control
Release testing covers the full sequence, but the value that most often determines acceptance is the m-value from the bending beam. Beams moulded from pressure ageing vessel residue are conditioned at minus 6 °C and loaded for 240 seconds; the m-value, taken as the slope of the log stiffness against log time curve at the 60-second loading point, must reach 0.300.
Derived test temperatures you can check
The two intermediate temperatures on a PG 58-16 certificate follow arithmetically from the grade, so a buyer can verify the document without reference to any other source.
| Test | Derivation | Result for PG 58-16 |
|---|---|---|
| PAV dynamic shear (fatigue) | (58 + −16) ÷ 2 + 4 | 25 °C |
| Bending beam (stiffness, m-value) | −16 + 10 | −6 °C |
Bitumen PG 58-16 specification
| Property | Test method | Requirement |
|---|---|---|
| Average 7-day max pavement design temperature | AASHTO M323 | 58 °C |
| Minimum pavement design temperature | AASHTO M323 | −16 °C |
| Original binder | ||
| Flash point, Cleveland open cup | AASHTO T48 | min 230 °C |
| Rotational viscosity @ 135 °C | AASHTO T316 | max 3 Pa·s |
| Dynamic shear G*/sinδ @ 58 °C | AASHTO T315 | min 1.00 kPa |
| After RTFOT (short-term ageing) | ||
| Change of mass | AASHTO T240 | max 1.00 % |
| Dynamic shear G*/sinδ @ 58 °C | AASHTO T315 | min 2.20 kPa |
| After PAV @ 100 °C (long-term ageing) | ||
| Dynamic shear G*·sinδ @ 25 °C | AASHTO T315 | max 5000 kPa |
| Creep stiffness S @ −6 °C | AASHTO T313 | max 300 MPa |
| m-value @ −6 °C | AASHTO T313 | min 0.300 |
The full PG 58-16 specification is tested to AASHTO M320 and reported on the certificate of analysis for every parcel. Nearest indicative equivalents: penetration grade 85/100, viscosity grade VG-20. These are reference points for discussion, not substitutions. A certificate of analysis accompanies every shipment; third-party inspection by SGS, Intertek or an equivalent surveyor can be arranged at the buyer instruction and account.
Where Bitumen PG 58-16 is used
Cold-region highways
Routes where thermal cracking rather than rutting is the documented failure mode in maintenance records, and where summer temperatures stay moderate.
Mountain and pass roads
Alignments with large diurnal swings, where the pavement cycles through a wide range within a single day and relaxation behaviour matters more than peak stiffness.
Continental rehabilitation works
Resurfacing in interior climates with cold winters and moderate summers, where the overlay must accommodate movement in the existing structure.
Temperate-cold airfields
Runway and taxiway surfacing in regions with cold winters but limited summer heat, where crack resistance is the governing requirement.
Northern municipal networks
Urban roads in cold regions where winter maintenance dominates lifecycle cost and traffic speeds are moderate.
Sub-base and binder layers
Lower layers in cold-climate pavements, insulated from peak surface heat but still exposed to thermal contraction.
Mix design and handling temperatures
Mixing and compaction temperatures are set from the binder viscosity–temperature relationship rather than from the grade designation alone. The ranges below are typical starting points for PG 58-16 and should be confirmed against the rotational viscosity figure on the delivered certificate.
| Operation | Typical range for PG 58-16 | Control note |
|---|---|---|
| Bulk storage | 145–165 °C | Circulate to prevent local overheating at the heating coils |
| Pumping and transfer | 145–165 °C | Confirm line tracing is operating before transfer begins |
| Hot mix asphalt mixing | 145–160 °C | Target viscosity approximately 0.17 Pa·s |
| Compaction | 125–145 °C | Target viscosity approximately 0.28 Pa·s; cease rolling below the lower figure |
| Maximum sustained heating | below 180 °C | Above this, oxidative hardening accelerates sharply |
Drummed material should be reheated in a controlled oven or hot room rather than by direct flame. Localised overheating hardens the binder at the drum wall and can take a compliant parcel out of specification before it reaches the mixer.
What happens when PG 58-16 is mis-specified
Where PG 58-16 is used on a route that turns out to carry slow or standing traffic, rutting appears even though the climate assessment was correct, because the traffic adjustment was omitted. This is the most common mis-application of the grade: the climate analysis is done properly and the traffic analysis is not.
Available packing for PG 58-16
| Packing | Net weight | Loading per 20 ft FCL | Typical use |
|---|---|---|---|
| New steel drum | 150 / 180 / 185 / 200 kg | 110 drums, 20.35 MT at 185 kg | Smaller parcels, sites without bulk storage |
| Jumbo bag | 1 MT | 20 MT | Lower packing cost, requires melting facility |
| Flexitank / bitutainer | 20–22 MT | 1 unit | Bulk economics without a bulk vessel |
| Bulk vessel | by parcel | heated tanker | Terminal to terminal, largest volumes |
As a PG 58-16 supplier Bitumen Asphaltive ships on CFR, CIF and FOB terms with commercial invoice, packing list, bill of lading, certificate of origin and certificate of analysis.
Questions specific to PG 58-16
Creep stiffness passes but m-value fails. What does that mean?
It means the binder is not excessively stiff but relaxes too slowly. Stress that builds as the pavement contracts is not dissipated in time, and cracking follows. Both criteria have to be met independently; passing one does not compensate for failing the other.
Is PG 58-16 suitable for a road that also carries heavy slow traffic?
Not without adjustment. Slow transient traffic raises the upper grade one level to PG 64-16, and standing traffic raises it two levels to PG 70-16. The lower grade remains minus 16 in both cases, since traffic does not affect the cold end.
How does PG 58-16 compare with penetration grade 85/100?
85/100 is often cited as the nearest penetration equivalent, but the comparison only addresses consistency at 25 °C. It says nothing about the bending beam behaviour at minus 6 °C, which is the whole reason PG 58-16 is specified.
Does PG 58-16 normally require polymer modification?
No. Both ends of its envelope are comparatively relaxed and most conventional crude slates will meet it straight-run at a moderate vacuum cut. That is a large part of why it is economical relative to wider-span cold-climate grades.
What mixing temperature should be used?
For an unmodified 58-series binder a mixing range of 145 to 160 °C is typical and compaction between 125 and 145 °C. These are starting points; the mix design should confirm them against the rotational viscosity data reported on the certificate.
The performance grade range
Intermediate temperatures below are derived from each grade, not selected by the supplier.
| Grade | Upper | Lower | Span | PAV DSR | Bending beam | Pen equiv. |
|---|---|---|---|---|---|---|
| PG 70-10 | 70 °C | −10 °C | 80 °C | 34 °C | 0 °C | 40/50 |
| PG 64-22 | 64 °C | −22 °C | 86 °C | 25 °C | −12 °C | 60/70 |
| PG 64-16 | 64 °C | −16 °C | 80 °C | 28 °C | −6 °C | 60/70 |
| PG 64-10 | 64 °C | −10 °C | 74 °C | 31 °C | 0 °C | 60/70 |
| PG 58-22 | 58 °C | −22 °C | 80 °C | 22 °C | −12 °C | 85/100 |
| PG 58-16 | 58 °C | −16 °C | 74 °C | 25 °C | −6 °C | 85/100 |
| PG 58-10 | 58 °C | −10 °C | 68 °C | 28 °C | 0 °C | 85/100 |
| PG 52-10 | 52 °C | −10 °C | 62 °C | 25 °C | 0 °C | 120/150 |
Speak to a Bitumen PG 58-16 supplier
Send quantity in metric tonnes, required packing, destination port and preferred Incoterm. Offers are normally returned within one working day.