Bitumen for Paint Manufacturing
Last updated: 2026-10-09
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Bitumen for Paint Manufacturing: Technical Specifications, Pricing, and Procurement Guide
Bitumen for paint — specifically industrial-grade oxidized bitumen (penetration 10/20 to 90/40) — is used at 5–25% of total paint formulation weight in anti-corrosion primers, roof coatings, and protective undercoats. Standard export pricing in 2025 ranges from $380–$620 per metric ton FOB depending on penetration grade, packaging, and origin. A typical 20-foot container holds 18–24 tonnes in steel drums or 25–26 tonnes in bulk flexitanks, with production lead times of 10–21 days from order confirmation.
This guide covers bitumen grades for paint, pricing data, specification tables, and sourcing logistics for paint manufacturers and industrial buyers.
Why Bitumen Is Used in Paint Formulations
Bitumen is a colloidal hydrocarbon system — primarily asphaltenes dispersed in maltenes — which gives it three properties that paint formulators pay for:
- Waterproofing: Bitumen films resist liquid water penetration at hydrostatic pressures up to 0.5 MPa at 1.5 mm dry film thickness.
- Chemical resistance: Resistance to dilute acids, alkalis, and saline solutions at ambient temperatures.
- Cost efficiency: At $380–$620/tonne, bitumen is significantly cheaper per cubic meter of protective film than epoxy ($2,800–$4,200/tonne) or polyurethane ($3,100–$4,800/tonne) resins.
Bitumen-based paints (also called bituminous coatings or asphalt paints) are used on:
- Steel pipelines and buried structures
- Roofing and foundation waterproofing
- Marine hulls and ballast tanks (in non-immersion zones)
- Concrete retaining walls and bridge abutments
- Automotive underbody coatings
Typical formulation loadings:
| Application | Bitumen Content (% w/w) | Typical Grade |
|---|---|---|
| Anti-corrosion primer | 15–25% | Oxidized 90/40 or 85/25 |
| Roof coating (cold-applied) | 35–50% | Oxidized 105/35 |
| Underbody coating | 20–30% | Oxidized 90/40 |
| Waterproof membrane paint | 40–60% | Penetration 40/50 |
| Pipe coating enamel | 60–75% | Penetration 10/20 (with filler) |
Bitumen Grades for Paint: Specifications and Comparison
Not all bitumen grades work in paint. The key selection factors are penetration index, softening point, solubility in solvents, and asphaltene content.
| Property | Oxidized 90/40 | Oxidized 85/25 | Oxidized 105/35 | Penetration 40/50 |
|---|---|---|---|---|
| Penetration @ 25°C (0.1 mm) | 85–95 | 80–90 | 100–110 | 40–50 |
| Softening point (°C) | 38–43 | 22–28 | 33–38 | 52–58 |
| Solubility in CS₂ (%) | ≥99.5 | ≥99.5 | ≥99.0 | ≥99.5 |
| Asphaltene content (%) | 22–28 | 18–22 | 24–30 | 12–18 |
| Flash point (°C) | ≥230 | ≥230 | ≥230 | ≥220 |
| Density @ 25°C (kg/m³) | 1,020–1,060 | 1,010–1,050 | 1,030–1,070 | 1,000–1,040 |
| Solvent compatibility | Xylene, toluene, white spirit | White spirit, kerosene | Xylene, naphtha | Xylene, toluene |
| Price FOB ($/tonne) | 420–520 | 450–560 | 480–620 | 380–470 |
Key selection criteria:
- Oxidized 90/40 is the workhorse grade for general-purpose bituminous paint — balanced hardness and flexibility.
- Oxidized 85/25 is used where lower softening point and higher flexibility are needed (e.g., cold-applied mastics).
- Oxidized 105/35 suits high-build roof coatings requiring greater hardness.
- Penetration 40/50 (straight-run or lightly oxidized) is preferred for pipe enamels and formulations requiring high filler loading.
| Parameter | Oxidized Bitumen | Straight-Run (Penetration Grade) |
|---|---|---|
| Process | Air-blown at 240–280°C | Vacuum distillation residue |
| Molecular structure | Higher asphaltenes, cross-linked | Lower asphaltenes, more maltenes |
| Weather resistance | Superior | Moderate |
| Flexibility at low temp | Lower (can crack below -5°C) | Higher (flexible to -20°C) |
| Solvent solubility | Slightly slower | Faster |
| Cost | 10–20% higher | Lower |
| Best for | Roof coatings, primers | Pipe enamels, waterproofing mastics |
Market Data: Pricing, Supply, and Export Logistics
| Origin | Grade | Price FOB ($/tonne) | MOQ (tonnes) | Lead Time (days) |
|---|---|---|---|---|
| Iran | Oxidized 90/40 | 420–490 | 20 | 14–21 |
| UAE | Oxidized 90/40 | 460–530 | 20 | 10–14 |
| Iraq | Penetration 40/50 | 380–440 | 50 | 18–25 |
| South Korea | Oxidized 105/35 | 520–620 | 18 | 12–18 |
| Bahrain | Oxidized 90/40 | 450–510 | 20 | 12–16 |
Prices as of Q1 2025. FOB basis. Bulk flexitank rates run $15–$30/tonne lower than drummed.
| Packaging | Net Weight per Unit | Cost Premium vs. Bulk | Container Load |
|---|---|---|---|
| New steel drum (200L) | 180–185 kg | +$25–$40/tonne | 18–20 tonnes |
| Reconditioned drum | 180–185 kg | +$15–$25/tonne | 18–20 tonnes |
| Poly-lined drum | 180–185 kg | +$30–$45/tonne | 18–20 tonnes |
| Flexitank (24,000L) | 24–25 tonnes | Baseline | 25–26 tonnes |
| ISO tank | 24–26 tonnes | +$10–$20/tonne | 24–26 tonnes |
| Kraft paper bag (25 kg) | 25 kg | +$50–$70/tonne | 18–20 tonnes |
Logistics considerations for paint manufacturers:
- Drummed cargo is preferred for plants without heated bulk storage (bitumen must be reheated to 120–160°C for pumping).
- Flexitanks reduce unit cost but require heated discharge equipment and a receiving tank with agitation.
- Transit time from Middle East to Europe: 18–28 days. To Southeast Asia: 12–20 days. To West Africa: 25–40 days.
- HS Code: 2713.20 (petroleum bitumen) — most origins enjoy preferential duty under bilateral trade agreements.
How to Formulate Bituminous Paint: Practical Guidelines
| Component | Function | % w/w | Notes |
|---|---|---|---|
| Oxidized bitumen 90/40 | Binder | 35–45% | Dissolve in solvent first |
| Xylene / white spirit | Solvent | 30–40% | Blend ratio 70:30 xylene:white spirit |
| Talc (micronized) | Filler | 10–18% | Reduces cost, improves sag resistance |
| Aluminium stearate | Thixotropic agent | 0.5–1.5% | Prevents settling |
| Anti-skinning agent | Stabilizer | 0.1–0.3% | For long shelf life |
| Biocide (optional) | Preservation | 0.1–0.5% | For water-contact applications |
1. Melt bitumen in a heated kettle at 140–160°C with continuous stirring.
2. Add solvent slowly — never add solvent to bitumen above 100°C due to flash risk. Cool melt to 90–100°C before solvent addition.
3. Disperse fillers using a high-speed disperser at 1,500–2,500 rpm for 20–30 minutes.
4. Add thixotropic agents and mix for an additional 10–15 minutes.
5. Cool to 40–50°C, then filter through a 100–150 micron mesh.
6. QC checks: viscosity (Brookfield, 25°C), density, non-volatile content, and drying time.
| Solvent | Dissolution Speed | Flash Point (°C) | VOC Status | Cost ($/tonne) |
|---|---|---|---|---|
| Xylene | Fast | 25–30 | Regulated | 900–1,100 |
| Toluene | Fast | 4–8 | Regulated | 850–1,050 |
| White spirit | Medium | 38–42 | Regulated | 800–950 |
| Kerosene | Slow | 38–45 | Regulated | 700–850 |
| D-limonene | Medium | 48–52 | Low-VOC | 2,200–2,800 |
| Mineral turpentine | Medium | 35–40 | Regulated | 850–1,000 |
For low-VOC or water-based bitumen emulsions, formulators use anionic or cationic emulsifiers (0.5–2.0% w/w) to disperse bitumen in water at 50–70% solids. Emulsion paint grades typically use penetration 60/70 or 80/100 bitumen at $400–$480/tonne FOB.
Procurement Checklist for Paint Manufacturers
Before placing a bitumen order for paint production, verify:
- Certificate of Analysis (COA): Confirm penetration, softening point, and solubility match your formulation spec.
- Solubility test: Request a sample and test dissolution in your specific solvent blend — batch-to-batch variation in asphaltene content can affect viscosity.
- Packaging compatibility: Confirm drum type or flexitank liner material resists solvent extraction (HDPE-lined drums are standard).
- Heating capability: Ensure your plant can reheat bitumen to 140–160°C for drummed product, or 120–140°C for bulk.
- Supplier certifications: ISO 9001, ASTM D946/D36 compliance, and third-party lab reports (SGS, Intertek).
- Shipping terms: FOB vs. CIF — CIF adds $40–$90/tonne for freight and insurance to European or Asian ports.
- Insufficient oxidation: Under-oxidized bitumen produces soft, tacky films that never fully cure. Always specify softening point range, not just penetration.
- High wax content: Bitumen with >3% wax shows poor solvent solubility and film defects. Request wax content data.
- Incompatible solvents: Aliphatic solvents (kerosene) dissolve oxidized bitumen slowly — allow 4–6 hours mixing time or use aromatic blends.
- Moisture contamination: Bitumen with >0.5% water causes foaming during heating and film blistering.
FAQ: Bitumen for Paint
What grade of bitumen is used in paint manufacturing?
The most common grades are oxidized bitumen 90/40, 85/25, and 105/35, along with penetration-grade 40/50 for pipe enamels. Oxidized grades are preferred for air-drying paints because their higher asphaltene content improves weather resistance and film hardness.
How much does bitumen for paint cost per tonne in 2025?
Bitumen for paint ranges from $380 to $620 per tonne FOB depending on grade and origin. Iranian oxidized 90/40 averages $420–$490/tonne, while South Korean oxidized 105/35 runs $520–$620/tonne. Bulk flexitank shipments cost $15–$30/tonne less than drummed cargo.
What percentage of bitumen is used in bituminous paint?
Bituminous paint formulations typically contain 15–50% bitumen by weight. Anti-corrosion primers use 15–25%, roof coatings use 35–50%, and pipe enamel can reach 60–75% with filler loading.
Can bitumen be used in water-based paint?
Yes — bitumen emulsions use 50–70% bitumen solids dispersed with anionic or cationic emulsifiers in water. Water-based bitumen paints are used for damp-proofing and roofing, with lower VOC emissions but requiring 24–48 hours drying time versus 4–8 hours for solvent-based versions.
What is the shelf life of bitumen-based paint?
Solvent-based bituminous paint has a shelf life of 12–24 months in sealed containers stored below 40°C. Water-based bitumen emulsions last