Specifications of Iraqi Bitumen

Specifications of Iraqi Bitumen: Grades, Tests, and a Buyer’s Guide (2025)

Iraqi bitumen is typically produced from Basrah and Kirkuk crude residues and supplied in penetration (40/50, 60/70, 80/100), viscosity (VG), and performance-graded (PG) forms. Buyers should verify softening point, penetration, ductility, flash point, and aging tests against ASTM/AASHTO methods and local SCRB requirements before shipment. (Details below.)

What makes Iraqi bitumen distinct in 2025?

Iraq refines medium-to-heavy, sour crudes (Basrah grades) and lighter Kirkuk streams. This feedstock mix yields vacuum residues with robust asphaltene content—useful for hot-climate pavements after controlled air-blowing. Oversight involves the national standards body COSQC and the Roads & Bridges specifications used by public projects. 

Quick facts

• Exported crude slates today: Basrah Heavy/Medium/Light and Kirkuk; Basrah Medium was introduced in 2021 to stabilize quality ranges. 

• Public works typically reference the “R9” Standard Specifications for Roads & Bridges (SCRB), which in turn point to ASTM test methods for binder acceptance. SCRB R9 

FAQ—Is Iraqi bitumen “harder” than average?
Often, yes: southern feedstocks are asphaltene-rich; after oxidation they show higher softening points suited to very hot summers—useful for rutting resistance when properly graded. (Inference based on the EIA/OIES crude quality notes above.) 

Which grades are produced—and when should each be used?

Most producers in Iraq and the Kurdistan Region supply:

• Penetration grades: 40/50, 60/70, 80/100 (per ASTM D946). 

• Viscosity grades (VG): VG-10/30/40 for legacy specs and certain plants.

• Performance-graded binders (PG): e.g., PG 64-16, PG 70-22, PG 76-10/-22 for high-temperature corridors, specified under AASHTO M 320. 

When to use what (examples)

• Urban arterials (Baghdad, Najaf): Pen 60/70 or PG 64-16 for standard traffic; upgrade to PG 70-22 for heavy buses.

• Expressways in Basra/Maysan: Consider PG 70-22 or PG 76-10 to manage >70 °C summer pavement temperatures.

• Mountain corridors (Erbil/Sulaymaniyah): Pen 80/100 or PG 64-16 to retain low-temperature flexibility.

FAQ—Is PG always better than penetration grades?
It’s more predictive of in-service performance (climate/traffic) but costs more. For routine works, a well-controlled 60/70 still performs if temperatures and loads are moderate.

How are specifications measured and verified?

Acceptance testing is routine and should be stated on the Certificate of Analysis (CoA). Key methods:

• Penetration at 25 °C: ASTM D5 (grade ID for Pen 40/50, 60/70, 80/100).

• Softening point (Ring-and-Ball): ASTM D36.

• Ductility at 25 °C: ASTM D113.

• Flash point (COC): ASTM D92.

• Solubility (trichloroethylene): ASTM D2042 (≥99%).

• Aging: TFOT/RTFO (ASTM D6/D1754).

• PG system: high-temp rutting (DSR), low-temp cracking (BBR/DSR) per AASHTO M 320 and MSCR (MP 19) when polymer-modified. 

Public contracts in Iraq commonly reference the Roads & Bridges standard (SCRB R9) and COSQC oversight for conformity. 

FAQ—Who should witness testing at loading?
Use an accredited third-party inspector to draw sealed samples, witness drum/bulk temperatures, and stamp the CoA against the RFQ limits.

What are realistic property ranges for common Iraqi grades?

Table 1 — Typical shipped properties (Iraqi producers, ASTM D946):

Ranges reflect common industry limits aligned with ASTM D946 and Iraqi SCRB acceptance tables; projects may tighten limits.

FAQ—Can I request higher softening point for 60/70?
Yes. Producers can adjust blowing to lift softening point within grade. Specify target (e.g., 53 ± 1 °C) in the PO.

How should climate and traffic in Iraq guide selection?

Iraq’s south often sees extreme pavement temperatures; central regions are hot with diurnal swings; north faces colder nights. Use PG designations tied to seven-day max and minimum pavement temperatures (e.g., PG 70-22). AASHTO M 320 explains the temperature logic; pair with MSCR for polymer-modified grades.

Example
Basra ring road with heavy truck flow: specify PG 76-10 (or PG 70-10 with MSCR “Jnr3.2” ≤ 2.0 kPa⁻¹) to manage rutting.

FAQ—Do PG numbers equal mix temperatures?
No. PG values describe pavement temperature windows, not mixing/compaction temperatures.

What packaging, logistics, and documentation should buyers expect?

• Forms: bulk (heated tankers/bitutainers), new steel drums (≈180 kg), jumbo bags for oxidized grades.

• Load temperatures: typically 150–170 °C for paving grades; record at manifold and last truck.

• Documents: CoA with full test list, batch numbers, sampling seals; HS code 2713.20 for most shipments.

FAQ—Is PG binder widely available from Iraqi plants?
Availability is expanding around major hubs; confirm plant line (conventional vs polymer-modified) and which PGs are routinely certified.

Acceptance protocol that works

1. Match the spec set: SCRB R9 for public jobs; private projects may choose ASTM D946 or AASHTO M 320 up front. State numeric limits: penetration band, softening point target, solubility ≥99%, flash ≥230 °C, RTFO/TFOT caps.

2. Add climate notes: PG grade tied to site temperatures; require MSCR for PMB.

3. Witness sampling: independent inspector; keep retains.

4. On-arrival check: re-test penetration/softening/ductility to confirm no thermal history damage.

FAQ—What if arrival penetration drifts by >5 dmm?
Hold for retest; check drum handling and transit heating logs before approving.

Executive checklist (print and use)

• Project spec chosen: SCRB R9 / ASTM D946 / AASHTO M 320

• Grade selected: Pen 40/50 | 60/70 | 80/100 or PG…

• Numeric limits declared on PO (penetration, softening point, ductility, flash, solubility, aging)

• Independent sampling & CoA required (include test list & batch IDs)

• Packaging & temperatures confirmed (bulk/drum/bitutainer; load/arrival temps logged)

• Retained samples sealed and stored for dispute resolution

Final Q&A

1) What is the most common paving grade supplied inside Iraq?
60/70 penetration grade, because it balances rutting resistance and flexibility for central and southern climates.

2) When should I choose 40/50 over 60/70?
Use 40/50 for very hot pavements and slow/heavy traffic where higher stiffness helps control rutting.

3) Does higher softening point always mean better performance?
Not alone—pair with ductility and aging results; overly stiff binders can crack at night temperatures.

4) Are Iraqi PG binders polymer-modified by default?
No. PG is a performance framework; modification is common for high-end grades (e.g., PG 76-10) but must be specified.

5) What minimum flash point should I accept?
≥230 °C (Cleveland Open Cup) for paving binders; this is a standard safety/quality threshold.

6) How do I translate climate into a PG number?
Use the site’s seven-day max and minimum pavement temperatures; for example, a site with +70 °C max and −10 °C min maps to PG 70-10.

7) Is solubility really important?
Yes—≥99% indicates purity and low inorganic contamination; low values signal extenders or contamination.

8) Can I blend 60/70 and 80/100 to hit 70/90?
Blending is possible but must be re-tested; nonlinear effects (asphaltenes/paraffins) can skew penetration and softening point.

9) Do drums damage binder quality during long transit?
Quality holds if drums are new, tightly sealed, and reheating is controlled; repeated overheating can reduce ductility.

10) Are Iraqi specs aligned with international practice?
Yes—public jobs follow R9, which references international test methods; private and export supply commonly meet ASTM D946 or PG M 320 limits.

Sources

1. Iraq crude grades — context on Basrah/Kirkuk streams and the 2021 Basrah Medium introduction. EIA country analysis

2. COSQC — Iraq’s national standards body and mandate. COSQC

3. SCRB R9 — Iraq’s Standard Specifications for Roads & Bridges (binder tests referenced in roadworks). SCRB R9

4. ASTM D946 — Penetration-graded asphalt binder specification and property framework. ASTM D946

5. AASHTO M 320 — Performance-graded asphalt binder framework and temperature logic. AASHTO M 320