Oxidized Bitumen Supplier: Grades, Specifications and Export Terms
Oxidized bitumen, also called blown bitumen or blown asphalt, is penetration grade bitumen that has been air-blown until its softening point rises and its temperature sensitivity falls. The result is a hard, rubbery, semi-solid material that stays dimensionally stable in heat that would make a paving grade flow. ZUMRUT INT Co. supplies the full grade range from 75/25 to 150/5, in 25 kg bags and cartons, palletised and shrink-wrapped, with a batch certificate of analysis issued before every shipment.
Grades supplied75/25 → 150/5
Softening point range70–150 °C by grade
StandardsASTM D312 · ASTM D36 · ASTM D5
Packing25 kg bag or carton, palletised
Loading22–23 MT per 20' container
Minimum orderTwo 20' containers (~45 MT)
Loading portsJebel Ali · Mersin · Iskenderun
Payment50% TT advance, balance vs B/L copy
Oxidized bitumen grades
In an oxidized grade the first number is the softening point in °C and the second is the penetration in dmm. So 85/25 softens at about 85 °C and has a penetration of about 25. Penetration grades such as 60/70 use the opposite convention, where both numbers describe penetration — which is why a buyer crossing between the two systems can order something several times harder than intended.
Across the range the trade-off is constant: a higher softening point buys heat resistance and costs flexibility. The table below is the practical guide.
| Grade | Softening point | Penetration | Typical use | Datasheet |
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| 75/25 | ~70–80 °C | ~20–30 dmm | General waterproofing, temperate climates | On request |
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| 85/25 | 80–90 °C | 20–30 dmm | Roofing felt, pipe coating, hot climates | PDF |
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| 85/35 | ~80–90 °C | ~30–40 dmm | Membranes needing movement tolerance | On request |
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| 90/10 | ~85–95 °C | ~10–20 dmm | Rigid industrial coatings, static surfaces | On request |
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| 90/40 | 85–95 °C | 35–45 dmm | Membranes and sealants where the substrate moves | PDF |
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| 95/25 | ~90–100 °C | ~20–30 dmm | Waterproofing and insulation in hot climates | On request |
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| 115/15 | 110–120 °C | 10–20 dmm | Electrical insulation, extreme heat, rigid substrates | PDF |
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We also produce 75/30, 85/40, 90/15, 105/5, 105/15, 105/35, 110/15 and 150/5, and other grades to a customer specification. Values marked with a tilde are the nominal figures implied by the grade designation; the certified range for any grade is issued with the batch certificate of analysis and can be sent before order. If you have a softening point and penetration requirement but no grade name, send the specification and we will match it.
The four grades we ship most
The hardest grade in common use, softening at 110 to 120 °C with a penetration of 10 to 20 dmm. Specified for electrical insulation, pipe coating and construction in the hottest climates, where the material must stay rigid and must not sag.
Air-blown from penetration grade 60/70, with better thermal stability and a higher softening point than the feedstock. A workhorse grade for construction, waterproofing and insulation where 85/25 is not quite hard enough.
The most widely traded oxidized grade worldwide. Softening point 80 to 90 °C, penetration 20 to 30 dmm. The standard choice for roofing felt and membrane manufacture, pipe coating and hydraulic sealing in hot climates.
An unusual pairing: a high softening point of 85 to 95 °C with a soft body of 35 to 45 dmm and roughly twice the extensibility of the harder grades. The grade to specify when the substrate moves.
What is oxidized bitumen?
Oxidized bitumen is produced by passing air through penetration grade bitumen, which gives it more rubbery properties than the original material. It is a hard bitumen used across the piling industry, roofing felts, waterproofing, sound dampening felts and under-carriage sealant in the automotive industry. Production runs as a continuous or staggered blowing process, and the most widely sold grades are 95/25, 85/25, 90/40 and 115/15.
Its high softening point makes it an excellent sealant for high-temperature applications. In use, blown bitumen is broken into small pieces and heated slowly to 220 to 230 °C. It is water-resistant, durable and chemically stable, and it tolerates temperature swings far better than a paving grade.
How oxidized bitumen is produced
Manufacturing starts by heating bitumen and transferring it from a furnace to an oxidation unit, where air blowing increases the volume by up to 70%. The process stiffens the bitumen and changes its softening point, penetration value and viscosity. A water jacket or water spray facility on the reactor head controls temperature, reducing oxygen content and cooling the material.
Engineers often add a catalyst to speed the reaction. The rate of oxidation depends both on the feedstock — its viscosity, penetration, softening point and reactivity — and on operational parameters such as temperature, pressure, air flow rate, degree of agitation, the ratio of air to feedstock and the type of catalyst. Blowing continues until sampling shows the softening point and penetration are inside the defined range, and then stops.
That last sentence is the whole quality question. The difference between 85/25 and 85/35 is where the blowing was stopped, and it is controlled by testing during production rather than by the clock.
You can see the complete process in the video here: [Oxidized Bitumen Process] ▶
Where oxidized bitumen is used
Waterproofing and roofing
The most common use. Resistance to water and weather makes it the base material for roofing felts, shingles and waterproofing membranes, forming a protective layer that keeps moisture out of the structure.
Construction and pavement
Adhesives and sealants: joint fillers in concrete pavements, expansion joints on bridges, and lining work in tunnels and reservoirs, where wear resistance extends the life of the structure.
Pipe coating and corrosion protection
Coating for pipelines carrying water and oil. The material shields metal from moisture, chemicals and environmental attack, considerably extending service life.
Industrial products
An ingredient in paints, lacquers and adhesives. Its ability to blend with polymers and other materials makes it suitable for high-performance coatings and insulation.
Soundproofing and insulation
Dense and elastic, which makes it effective for sound damping and vibration resistance — used in car manufacturing, building construction and specialist insulation products.
Cable coating
Insulation and protective coating for underground cables in the electrical industry, chosen for resistance to temperature extremes and ground conditions.
In short, oxidized bitumen matters across industries from construction to manufacturing. Durability, flexibility and resistance to environmental factors are what make it hard to replace.
Packing and container loading
Oxidized bitumen is solid at ambient temperature, so it ships as cast blocks in bags or cartons rather than in bulk. Blocks are delivered solid and melted on site.
| Packing | Unit | 20' container | Notes |
|---|
| PP bag, palletised and shrink-wrapped | 25 kg | 22–23 MT | Most common export format; stacks and handles well |
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| Kraft paper bag, palletised and shrink-wrapped | 25 kg | 22–23 MT | Recyclable, with an inner coating so the block releases cleanly |
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| Carton box, palletised and shrink-wrapped | 25 kg | 22–23 MT | Removable mould, easiest to strip at destination |
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| Other formats on request | 20 / 50 kg bag, 200 kg drum | Quoted per order | Tell us at enquiry stage; it changes the loading plan and the price |
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All standard formats are palletised and shrink-wrapped, which is what stops blocks fusing in transit through a hot climate. The 25 kg carton with a removable mould is the easiest to handle at destination and cools quickly; the kraft bag is recyclable and lined so the bitumen does not stick; meltable bags that go into the melt with the material can be quoted where the plant is set up for them.
Our minimum order for oxidized bitumen is two 20' containers, roughly 45 MT at 22 to 23 MT per container. Mixed grades within one shipment are accepted provided each grade reaches a full container.
Payment, inspection and documentation
Our standard terms are 50% by TT in advance, balance against a copy of the Bill of Lading. The advance secures production and loading; the balance falls due once the cargo is demonstrably on the water and documented. We do not work on letters of credit — bank charges and discrepancy risk end up in the per-tonne figure, and saying so plainly saves a week of negotiation.
Every shipment travels with a commercial invoice, packing list, bill of lading, certificate of origin, safety data sheet and the batch certificate of analysis. SGS, Bureau Veritas, Intertek or the surveyor named in your contract can attend loading for quality and quantity. Shipping documents are issued within three days of vessel departure.
We load from Jebel Ali, Mersin and Iskenderun, and the port we quote from depends on the destination and the packing you choose. The exact port and sailing are confirmed with the quotation.
Why buy oxidized bitumen from ZUMRUT
ZUMRUT International Kimya has been trading bitumen since 2012, operating from Turkey and the UAE. Products are supplied to ASTM and ISO standards, with every batch tested and certified before shipment so that quality is consistent across grades and destinations.
Over the past decade we have delivered oxidized bitumen to more than 50 countries across Europe, Asia, Africa and the Middle East — construction firms, roofing manufacturers, pipeline contractors and industrial clients who cannot afford a late or off-specification shipment. From the widely used grades such as 85/25, 95/25 and 90/40 through to specialty grades like 115/15 and 150/5, every consignment leaves fully documented and ready for customs clearance.
Direct access to production in Turkey combined with a logistics hub in Dubai removes the intermediaries, which is what allows transparent pricing, shorter lead times and full shipment traceability. Packing is adapted to your requirement rather than the other way round, and our technical team can help with grade selection, test documentation and export paperwork from the first enquiry through to delivery.
Frequently asked questions
What do the two numbers in an oxidized grade mean?
The first is the softening point in °C, the second is the penetration in dmm. So 85/25 softens at about 85 °C with a penetration of about 25. This is the opposite convention to penetration grades such as 60/70, where both numbers describe penetration.
Is oxidized bitumen the same as blown asphalt?
Yes. Blown asphalt, blown bitumen and oxidized bitumen are the same product under different names, from the air-blowing process used to make it. Suppliers and specifications use the terms interchangeably.
What is the minimum order quantity?
Two 20' containers, roughly 45 MT in total at 22 to 23 MT per container, available in all grades and packing options. Mixed grades within one shipment are accepted provided each grade reaches a full container.
Which grades do you supply?
The full range: 75/25, 75/30, 85/25, 85/35, 85/40, 90/10, 90/15, 90/40, 95/25, 105/5, 105/15, 105/35, 110/15, 115/15 and 150/5, plus other grades produced to a customer specification.
How do I choose between two grades with the same softening point?
By movement. Grades such as 90/10 and 90/40 resist the same heat, but 90/10 is rigid and 90/40 is extensible. If the substrate expands, contracts or settles, the softer grade follows it; the harder one cracks. Tell us the application rather than the grade and we will say which one the job needs.
At what temperature is it applied?
Typically 200 to 230 °C depending on grade, well above the softening point. Heat indirectly in an oil-jacketed kettle or thermostatically controlled melter and bring a cold charge up steadily. Keep a clear margin below the 250 °C minimum flash point.
Do your products meet international standards?
Yes. Grades are produced and tested to ASTM and ISO standards, and every batch is certified before shipment. The certificate of analysis carries the lot number and production date with the actual test results, not generic typical values.
Can you supply in bulk rather than bagged?
Oxidized bitumen is solid at ambient temperature, so it ships as cast blocks in 25 kg bags or cartons. If your plant is set up for a different format, tell us at enquiry stage and we will tell you what can be arranged.
How long does delivery take?
Production and loading takes 7 to 14 business days after order confirmation. Transit depends on the destination and the loading port, and is confirmed with the quotation rather than assumed. Shipping documents follow within three days of vessel departure.
How should oxidized bitumen be stored?
Under shelter, dry, out of direct sunlight and rain, in its original packing and not over-stacked. Stored correctly it holds its properties for years; the usual cause of loss is damaged packaging or blocks fusing in heat, not the material ageing.
Do you ship worldwide?
Yes. We have exported to more than 50 countries across Europe, Asia, Africa and the Middle East, and can arrange shipment to any major port. Loading is from Jebel Ali, Mersin and Iskenderun.
What is the price of oxidized bitumen?
It moves with feedstock cost, ocean freight, packing choice and destination, so a flat published number would not hold. Indicative levels are on our bitumen price page. Send grade, quantity, packing, destination port and Incoterm and we issue a firm FOB, CFR or CIF quotation within one business day.
Technical reference
The table below gives the general property ranges across the oxidized range. Grade-specific limits are in the grade table above and in each grade's own datasheet.
| Property | Unit | Typical Value | Test Method |
| Penetration | 0.1 mm (dmm) | 10-20 | ASTM D5 |
| Softening Point | °C | 95-110 | ASTM D36 |
| Density | g/cm³ | 1.00-1.05 | ASTM D70 |
| Viscosity | Pa.s | 200-400 | ASTM D4402 |
| Loss on Heating | % (by weight) | ≤ 0.2 | ASTM D6 |
| Fraass Breaking Point | °C | ≤ -5 | ASTM D3111 |
| Ash Content | % (by weight) | ≤ 0.5 | ASTM D2415 |
| Flash Point | °C | ≥ 250 | ASTM D92 |
Request a quotation for oxidized bitumen
Send us the grade, quantity in MT, packing format, destination port and Incoterm. We come back with a firm price, a production schedule and the documentation list for clearance within one business day. If you have a softening point and penetration requirement but no grade name, send the specification instead and we will match it.
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