Iranian Bitumen 60/70: Penetration Grade Specifications and Bulk Export Packaging

Bitumen 60/70 is the penetration grade that defines the global road-construction bitumen trade, and Iran is one of the world’s largest exporters of it. Produced from Iranian heavy crude at refineries in Tehran, Isfahan, Tabriz and Bandar Abbas, Iranian 60/70 bitumen lands at destination competitively against Gulf, South Korean and Venezuelan origin, and is the grade most often specified by road contractors, asphalt plants and government infrastructure programmes. This guide is the technical specification and packaging framework we apply to every Iranian bitumen 60/70 bulk export shipment, and it is the framework we recommend buyers require from any bitumen supplier they evaluate.

What “60/70” means and why it is the standard paving grade

The “60/70” designation refers to the penetration grade: under standard test conditions (100 g load, 5 seconds, 25°C), a standard needle penetrates the bitumen to a depth of 60 to 70 tenths of a millimetre (0.6-0.7 mm). The penetration value is the bitumen’s hardness indicator: lower penetration means a harder bitumen, higher penetration means a softer bitumen. 60/70 is a medium-hard grade, suitable for most asphalt concrete and road base applications in temperate and hot climates — which is most of the world’s road-building geography.

The grade choice is a climate choice. 60/70 is the general-purpose grade for temperate and hot climates; 80/100 (softer) is the grade for cold climates, where a softer bitumen resists thermal cracking in winter; 40/50 (harder) is the grade for hot desert climates where a harder bitumen resists rutting in summer. A road contractor in a temperate or hot climate specifies 60/70; the same contractor with a cold-climate project specifies 80/100.

The ASTM specification set for 60/70 bitumen

The full specification we ship with every 60/70 bitumen export, with the ASTM test methods:

• Penetration at 25°C: 60-70 (0.1 mm), ASTM D5
• Softening point (ring and ball): 49-56°C, ASTM D36
• Ductility at 25°C: 100 cm minimum, ASTM D113
• Kinematic viscosity at 135°C: ASTM D4402 (the value is reported, not a fixed range, because viscosity is temperature-dependent)
• Flash point (Cleveland open cup): 230°C minimum, ASTM D92
• Loss on heating (thin film oven test): 0.2% maximum mass loss, ASTM D6 (a high loss-on-heating value indicates the bitumen will harden excessively in the asphalt plant’s drying drum)
• Solubility in trichloroethylene: 99.0% minimum, ASTM D4 (a low solubility indicates contamination with non-bitumen material)
• Specific gravity at 25°C: 1.01-1.05, ASTM D70
• Drop point / penetration after thin film oven test: reported, as the indicator of how the bitumen will perform after the asphalt plant’s heat exposure

A refinery test certificate reporting each of these values, for the specific lot, travels with every shipment. A buyer who accepts “60/70” on a proforma without the refinery certificate is a buyer whose grade claim is unverified — and the most common bitumen fraud is the substitution of a softer or contaminated bitumen that passes a visual inspection and fails a viscosity or solubility test at the asphalt plant.

Why the refinery certificate matters: the substitution risk

Bitumen fraud is not a hypothetical. The most common substitution patterns are: cutting 60/70 with a cheaper cutback oil (diluent) to extend the volume, which lowers the viscosity and the softening point and produces an asphalt that rutts in summer; blending 60/70 with a heavier residue, which raises the viscosity and produces an asphalt that cracks in cold; and mislabelling a softer grade (80/100) as 60/70, which produces an asphalt whose properties do not match the road design’s assumptions.

All three substitutions pass a visual inspection — bitumen is a black, viscous liquid, and one 60/70 looks like another. They fail the penetration, viscosity, solubility and loss-on-heating tests. This is why the refinery test certificate is the document — not the supplier’s assertion. We attach the certificate to the proforma before the buyer contracts, and we ship the cargo with the certificate that matches the lot.

Packaging formats: drum, jumbo bag, and bulk Iso-tank

Iranian bitumen is exported in three packaging formats, each suited to a different buyer’s destination infrastructure:

New steel drums (180-200 kg net)

The default for buyers without heated tank storage. 80 drums per 20ft container, approximately 14-16 metric tons per container. Drums are sealed at the refinery, transported to the destination, and decanted at the asphalt plant by heating the drum (typically in a drum-melting oven) and pouring the bitumen into the plant’s mixing system. The drum format is the workhorse of the bitumen export trade because it does not require the buyer to have heated tank infrastructure — the drum is the storage and the transport container, and the melting oven is a standard piece of asphalt-plant equipment.

Jumbo bags (1,000 kg net)

A lower packaging cost per ton than drums and faster decanting — a jumbo bag is lifted into a heated hopper and decanted as a single 1,000 kg unit rather than 80 individual drums. The trade-off is that the jumbo bag requires a heated hopper and a lifting frame at destination, which is a higher infrastructure bar than the drum-melting oven. Approximately 20-22 jumbo bags per 20ft container, ~20-22 metric tons per container.

Bulk (Iso-tank or heated reefer tank)

The lowest per-ton logistics cost for buyers with heated tank storage. An Iso-tank carries approximately 24-25 metric tons of bitumen, heated and insulated to maintain the bitumen at a pumpable temperature during transit. At destination, the Iso-tank is connected to the buyer’s heated tank farm, the bitumen is pumped out, and the Iso-tank is returned. The format requires the buyer to have heated tank reception — a bar that most state-level asphalt programmes and large contractors clear, but that small contractors and project-by-project buyers do not.

The packaging choice is a destination-infrastructure decision. A contractor with drum-decanting capability and no heated tank should buy drums; a state-level asphalt programme with heated tank storage should buy bulk. The packaging decision belongs at the proforma stage, not at the loading stage.

The refinery-direct pricing question

Iranian bitumen is produced at multiple refineries, and the refinery-direct price is the FOB Bandar Abbas (or FOB the refinery’s nearest port) price, ex-refinery. The price the buyer pays is the refinery-direct price plus the inland transport from refinery to port, the packaging cost (drums, jumbo bags, or bulk tank rental), the export documentation, and the ocean freight to destination. The element that varies most between suppliers is not the refinery price — which is published and known — but the packaging, inland transport and documentation margin that the supplier adds. We quote the full landed-cost breakdown so the buyer can see each element, not a single opaque CFR number.

Lead time, MOQ and the refinery scheduling

• Minimum order: one 20ft container (~14-16 tons drums, ~20-22 tons jumbo, ~24-25 tons bulk Iso-tank) for standard export; vessel-load volume (12,500-50,000 tons) for bulk charter.
• Lead time: 10-18 days from proforma acceptance for drum and jumbo orders, depending on the refinery’s shipping schedule and the drum-packing facility’s queue; 12-20 days for Iso-tank, depending on tank availability; 30-45 days for bulk charter, depending on vessel availability and refinery loading-window scheduling.

Documentation set

Every bitumen export ships with:

• Refinery test certificate (penetration, softening point, ductility, viscosity, flash point, loss on heating, solubility, specific gravity) — the lot-specific certificate, not a generic spec sheet.
• Certificate of Origin from the Iran Chamber of Commerce.
• Packing list and commercial invoice matched to the bill of lading.
• MSDS (Material Safety Data Sheet) for the bitumen grade.
• Bill of lading (sea) or transport document (overland).
• Hazardous-cargo declaration where the destination requires it (bitumen is classified differently by jurisdiction — some treat it as non-hazardous, some as Class 9; we confirm the destination classification before quoting).

For the full document workflow, the Iran export documentation checklist is the companion guide. For the payment-channel framework that underpins every Iranian petrochemical export, our payment methods for Iranian exports guide covers the working channels.

Putting it together

Iranian bitumen 60/70 is a commodity trade where the buyer’s edge comes from specification verification, packaging fit, and transparent landed-cost pricing — not from a “deal” on the headline FOB number. The buyers who succeed require the refinery certificate at the quote stage, choose the packaging that fits their destination infrastructure, and work with a supplier (Palude) that breaks the landed cost into its components. To begin, request a sourcing quote with your grade, packaging format, volume and destination port, and an industrial-minerals advisor will respond within one business day.