Bitumen for Cable Filling Compound
Last updated: 2026-10-09
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Bitumen for Cable Filling Compound
Bitumen for cable filling is a penetration-grade or oxidized bitumen (typically 60/70, 10/20, or R90/15) used as the dielectric impregnant inside oil-filled and mass-impregnated power cables. Global demand for cable-filling bitumen sits at approximately 280,000–350,000 tonnes per year, with prices ranging from USD 480–720 per tonne FOB depending on grade, oxidation level, and origin. A standard 20-foot container holds 22–24 tonnes of bitumen in steel drums or 25 kg bags, with lead times of 10–21 days from Gulf, Iranian, or Southeast Asian refineries.
What Is Bitumen for Cable Filling?
Cable filling compound — sometimes called cable impregnant or cable jelly — is a specially refined bitumen blended to remain semi-solid at operating temperatures while delivering high dielectric strength. Unlike paving-grade bitumen, cable-filling grades undergo controlled oxidation (air blowing) to raise softening point, reduce thermal expansion, and eliminate volatile content that would cause voids or ionization inside insulation.
Three properties separate cable-filling bitumen from standard grades:
- Dielectric strength: minimum 12–20 kV/mm at 20°C
- Softening point: 85–115°C (ring and ball), depending on cable class
- Penetration at 25°C: 10–40 dmm (0.1 mm), indicating hardness
- Loss tangent (tan δ): below 0.002 at 90°C for high-voltage applications
- Flash point: above 250°C (Cleveland open cup)
Mass-impregnated non-draining (MIND) cables for offshore and submarine applications use the hardest grades, while low-voltage underground cables tolerate softer, more economical blends.
| Grade | Softening Point (°C) | Penetration 25°C (dmm) | Dielectric Strength (kV/mm) | Primary Use |
|---|---|---|---|---|
| 10/20 oxidized | 95–110 | 10–20 | 15–20 | HV submarine, MIND cables |
| 60/70 + additive | 48–56 | 60–70 | 8–12 | LV filling, joint boxes |
| R90/15 | 85–95 | 12–18 | 14–18 | MV/HV oil-filled cables |
| R115/15 | 110–120 | 12–18 | 16–20 | EHV, deep-water cables |
| Blown 85/25 | 82–90 | 22–28 | 12–16 | General cable filling |
Specifications typically follow IEC 60296 (insulating liquids), BS 148, or customer-specific refinery datasheets. Buyers should always request a Certificate of Analysis (CoA) covering penetration, softening point, and dielectric loss.
How Cable Filling Bitumen Is Produced
Production follows four refinery stages:
1. Vacuum distillation of crude to produce short residue (penetration 200–400 dmm)
2. Air blowing (oxidation) at 240–280°C to reach target softening point — typically 6–14 hours per batch
3. Blending with additives (polyisobutylene, microcrystalline wax) to tune viscosity and prevent drainage
4. Filtering and packaging into drums, bags, or heated tankers
Refineries in Iran, the UAE, Saudi Arabia, and South Korea dominate export supply. Iranian oxidized bitumen (grades 85/25, 90/15, 95/10) accounts for a significant share of Asian and African cable-filling demand due to competitive pricing — often 8–15% below UAE equivalents.
- Feedstock (short residue): 65–75% of total cost
- Air-blowing energy: 8–12%
- Additives: 5–10%
- Packaging (drums/bags): 5–8%
- Freight and logistics: 10–20% of landed cost
Market Prices: 2024–2025 Benchmarks
| Origin | Grade | FOB Price (USD/tonne) | MOQ (tonnes) | Lead Time (days) |
|---|---|---|---|---|
| Iran (Bandar Abbas) | 90/15 oxidized | 490–560 | 22 | 14–21 |
| UAE (Jebel Ali) | 85/25 blown | 540–620 | 22 | 7–14 |
| Saudi Arabia | R90/15 | 580–680 | 24 | 10–18 |
| South Korea | 10/20 HV grade | 650–730 | 20 | 12–20 |
| Singapore (re-export) | 60/70 + additive | 520–600 | 22 | 5–10 |
Prices fluctuate with crude benchmarks (Brent, Iranian Light) and shipping rates. In Q1 2025, cable-filling bitumen premiums over paving grade averaged USD 60–120 per tonne, reflecting the extra oxidation and quality control.
| Packaging | Unit Cost (USD/tonne) | Handling | Best For |
|---|---|---|---|
| New steel drums | +45–65 | Manual/ forklift | Export, small orders |
| Reconditioned drums | +25–35 | Manual | Regional buyers |
| 25 kg PP bags | +30–40 | Manual | Africa, South Asia |
| Flexitank (bulk) | +8–15 | Pump required | 20+ tonne orders |
| Heated ISO tank | +12–20 | Pump required | Continuous production |
For a cable manufacturer consuming 500 tonnes/month, switching from drums to flexitanks can save USD 15,000–25,000 per month.
Buying Guide: 7 Factors for Cable Filling Bitumen
- Dielectric loss (tan δ): Must be < 0.002 at 90°C for HV; < 0.005 acceptable for LV
- Thermal stability: No more than 2% weight loss after 168 hours at 100°C
- Penetration index: Between –0.5 and +1.0 for dimensional stability
- Drainage resistance: Critical for MIND cables at 70–90°C continuous operation
- Compatibility: Must not react with XLPE, paper tape, or copper conductors
- CoA and third-party testing: SGS, Intertek, or Bureau Veritas verification
- Supplier audits: ISO 9001, ISO 14001, and REACH compliance for EU exports
| Test | Standard | Acceptable Range |
|---|---|---|
| Penetration @ 25°C | ASTM D5 | 10–40 dmm |
| Softening point | ASTM D36 | 85–120°C |
| Flash point | ASTM D92 | > 250°C |
| Dielectric strength | IEC 60156 | > 12 kV/mm |
| Loss tangent @ 90°C | IEC 60247 | < 0.002 |
| Density @ 25°C | ASTM D70 | 0.98–1.05 g/cm³ |
| Wax content | DIN 51556 | < 3% |
Always demand a pre-shipment sample of 1–2 kg before confirming a 22-tonne container order. Lab testing costs USD 150–400 per sample and prevents costly rejections.
Logistics and Shipping Considerations
Cable-filling bitumen ships as a non-hazardous material (UN 3257 or non-regulated depending on flash point), but temperature control matters:
- Drums and bags: Ship at ambient temperature; store below 40°C to prevent block formation
- Flexitanks: Require heating to 80–100°C for discharge — confirm receiver has steam or electric heating
- ISO tanks: Best for repeat buyers; heating coils standard
Typical shipping times:
- Bandar Abbas → Jebel Ali: 2–4 days
- Jebel Ali → Mumbai: 5–8 days
- Bandar Abbas → Shanghai: 18–25 days
- Jebel Ali → Rotterdam: 20–28 days
- South Korea → Los Angeles: 14–20 days
Payment terms for first orders are usually 100% LC at sight or 30% TT deposit + 70% against B/L copy. Established buyers negotiate 30–60 day credit with annual contracts.
| Packaging | Tonnes per 20ft | Tonnes per 40ft |
|---|---|---|
| Drums (150 kg) | 22–24 | 26–28 (weight-limited) |
| 25 kg bags | 22–24 | 26–28 |
| Flexitank | 20–22 | 24–26 |
| ISO tank (heated) | 20–22 | — |
FAQ: Bitumen for Cable Filling
What bitumen grade is best for cable filling?
For high-voltage and submarine cables, oxidized grades 10/20 or R90/15 with softening points of 85–115°C are standard. Low-voltage applications can use 60/70 penetration bitumen blended with additives. The choice depends on operating temperature and dielectric requirements.
How much does cable-filling bitumen cost per tonne in 2025?
FOB prices range from USD 480–730 per tonne, with Iranian 90/15 at the low end and Korean HV grades at the high end. Landed costs add USD 40–120 per tonne depending on destination and packaging. Bulk flexitank orders reduce unit costs by 8–15%.
What is the minimum order quantity for cable-filling bitumen?
Most exporters require a 20-foot container minimum — approximately 22–24 tonnes in drums or bags. Some suppliers offer 5–10 tonne trial orders at a 10–20% price premium. Flexitank MOQs are typically 20 tonnes.
How long does cable-filling bitumen last in storage?
Sealed drums and bags store for 24–36 months without significant property degradation. Flexitank and ISO tank contents should be used within 12 months. Store below 40°C, away from direct sunlight, and re-test dielectric strength if stored beyond 18 months.
Which countries export the most cable-filling bitumen?
Iran, the UAE, and Saudi Arabia lead global exports, followed by South Korea and Singapore for high-grade HV compounds. Iranian supply dominates price-sensitive markets in Africa and South Asia, while Korean and European refineries serve premium HV cable manufacturers.
Get an Instant Cable-Filling Bitumen Quote
Calculating your true landed cost — including FOB price, freight, drums vs. flexitank, insurance, and port charges — takes minutes with the 6Tar cost calculator. Enter your destination port, required grade, and monthly volume to receive a line-item breakdown in USD per tonne and total shipment cost.
Whether you need 22 tonnes of 90/15 oxidized bitumen for a submarine cable project or 500 tonnes per month of 60/70 compound for LV production, 6Tar connects you with verified refineries in Iran, the UAE, and South Korea — complete with CoA, third-party inspection, and door-to-door logistics.
Start your calculation now and lock in Q2 2025 pricing before the next crude adjustment.