Bitumen 40/50 Bhutan
Last updated: 2026-10-09
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Bitumen 40/50 in Bhutan is supplied at approximately $480–$560 per metric ton (MT) FOB India or CIF Phuentsholing, with the penetration grade meeting IS 73:2013 / ASTM D946 specifications (penetration depth of 40–50 dmm at 25°C). Standard export volume runs 20–25 MT per 20-ft container or bulk tankers of 500–1,000 MT, with transit from Indian refineries to Bhutanese border points taking 3–7 days depending on the entry gate. Bhutan imports 100% of its bitumen — roughly 8,000–12,000 MT annually — primarily through Phuentsholing, Gelephu, and Samdrup Jongkhar.
What Is Bitumen 40/50 and Why Does Bhutan Import It?
Bitumen 40/50 is a penetration-grade paving bitumen classified by needle penetration at 25°C. A penetration value of 40–50 dmm means the material is relatively hard, making it well suited to hot climates and heavy axle loads — though Bhutan's varied altitude and temperature profile (from tropical southern plains to Himalayan passes above 3,000 m) requires careful grade selection.
| Property | Bitumen 40/50 Specification | Test Method |
|---|---|---|
| Penetration @ 25°C | 40–50 dmm | ASTM D5 / IS 1203 |
| Softening Point | 50–58°C | ASTM D36 / IS 1205 |
| Flash Point | Min. 225°C | ASTM D92 / IS 1209 |
| Solubility in TCE | Min. 99.0% | ASTM D2042 |
| Specific Gravity @ 25°C | 1.01–1.06 | ASTM D70 |
| Ductility @ 25°C | Min. 100 cm | ASTM D113 |
| Loss on Heating | Max. 0.2% | ASTM D1754 |
| Viscosity @ 60°C | 200–400 Pa·s | ASTM D2171 |
Bhutan has no domestic bitumen refining capacity. All supply is imported — predominantly from Indian refineries (IOCL, BPCL, HPCL, Numaligarh) and occasionally from Bangladesh or Nepal via re-export. This makes land border logistics through Phuentsholing the critical supply artery.
- Road connectivity programs under the Ministry of Infrastructure and Transport — over 18,000 km of road network
- Hydropower access roads (Punatsangchhu, Mangdechhu, Kholongchhu projects)
- Border trade routes linking India's Assam and West Bengal corridors
- Seasonal constraints: monsoon (June–September) and winter snow (December–February) compress the paving window to roughly 6–7 productive months
Pricing, Supply Routes, and Landed Cost in Bhutan
Because Bhutan is landlocked, the landed cost of bitumen 40/50 depends heavily on the Indo-Bhutan border entry point and the cost of inland transport from the nearest Indian depot.
| Cost Component | Range (USD/MT) | Notes |
|---|---|---|
| Ex-refinery / depot price (India) | 430–490 | Varies with crude benchmarks |
| Drum packing premium | 25–40 | New steel drums, 182 kg each |
| Bulk tanker handling | 10–20 | For 500+ MT consignments |
| Inland freight to Phuentsholing | 30–50 | From Siliguri / Jalpaiguri depots |
| Bhutan customs & clearance | 15–30 | Duties + handling |
| Landed cost (Phuentsholing) | 500–600 | Drums, delivered |
| Landed cost (interior sites) | 560–680 | Depends on distance & road quality |
| Entry Point | Nearest Indian Hub | Transit Time (loaded) | Typical Monthly Volume |
|---|---|---|---|
| Phuentsholing | Siliguri / Hasimara | 1–3 days | 400–700 MT |
| Gelephu | Guwahati / Rangia | 2–4 days | 150–300 MT |
| Samdrup Jongkhar | Guwahati / Nagaon | 3–6 days | 100–250 MT |
| Nganglam | Guwahati | 4–7 days | 50–120 MT |
- Phuentsholing handles roughly 60–70% of Bhutan's total bitumen imports.
- Drum packing (182 kg) dominates because interior road conditions and small site volumes make bulk tankers impractical.
- Bulk shipments are economical only for large hydropower and highway packages exceeding 300–500 MT.
| Grade | Penetration (dmm) | Typical Bhutan Landed Price (USD/MT) | Best Use in Bhutan |
|---|---|---|---|
| 30/40 | 30–40 | 510–610 | High-altitude, cooler zones |
| 40/50 | 40–50 | 500–600 | General paving, southern belt |
| 60/70 | 60–70 | 495–590 | Warmer southern plains |
| 80/100 | 80–100 | 490–580 | Low-traffic, cold mix |
| VG-30 | Viscosity grade | 520–620 | Heavy traffic, expressways |
Technical Suitability: Is 40/50 Right for Bhutan's Climate?
Bhutan's climate ranges from subtropical in the south (Phuentsholing, ~28°C average) to alpine in the north (below freezing for months). Penetration grade selection must match the pavement service temperature, not just the country's average.
| Zone | Representative Locations | Road Surface Temp Range | Recommended Grade |
|---|---|---|---|
| Southern plains | Phuentsholing, Gelephu, Samdrup Jongkhar | 15–55°C | 60/70 or 40/50 |
| Mid-hills | Thimphu, Paro, Wangdue | 0–45°C | 40/50 |
| High altitude | Trashigang passes, Haa, Gasa | −10–35°C | 30/40 or PMB |
- 40/50 is the workhorse grade for mid-hill and general national highway work in Bhutan.
- In the southern tropical belt, 60/70 may perform better against rutting.
- At high altitudes, 40/50 can become brittle — polymer-modified bitumen (PMB) or 30/40 is preferred.
- Bhutanese specifiers increasingly reference IRC:111 and IS 73:2013 for grade selection, mirroring Indian practice.
| Criterion | Bitumen 40/50 | Bitumen 60/70 | PMB (Modified) |
|---|---|---|---|
| Rutting resistance | High | Medium | Very high |
| Low-temp cracking | Medium | Good | Very good |
| Cost (USD/MT landed) | 500–600 | 495–590 | 620–780 |
| Bhutan availability | High | High | Limited/order-based |
| Best altitude band | 500–2,000 m | 0–1,000 m | All altitudes |
Sourcing, Quality Control, and Documentation
Importing bitumen into Bhutan involves strict documentation and quality verification, especially for government-funded road projects that mandate third-party testing.
- Commercial invoice and packing list
- Bill of Lading / Consignment Note (Indian side)
- Certificate of Analysis (COA) — penetration, softening point, flash point
- Bhutan Sales Tax / Customs clearance documents
- Test certificate from NABL-accredited lab (for government tenders)
- Phytosanitary / transport permits where applicable
| Stage | Test | Acceptable Range |
|---|---|---|
| Pre-shipment | Penetration @ 25°C | 40–50 dmm |
| Pre-shipment | Softening point | 50–58°C |
| Pre-shipment | Flash point | ≥225°C |
| At border | Drums integrity / seal check | No leakage, sealed |
| On-site | Retained sample test | Within 5% of COA |
- Drum seals must remain intact until site delivery — Bhutanese inspectors frequently reject tampered consignments.
- Retained samples are kept for at least 12 months for dispute resolution.
- Government tenders typically require COA from a NABL-accredited laboratory in India or Bhutan.
- Penetration variance of more than ±5 dmm from spec is grounds for rejection.
- Monsoon road closures delaying delivery by 3–10 days
- Indian refinery turnarounds causing supply gaps of 2–4 weeks
- Currency fluctuation between INR and USD affecting landed cost by 2–5%
- Drum shortages during peak paving season (October–May)
- Landslide-related route closures on Phuentsholing–Thimphu highway
Procurement Best Practices for Bhutanese Buyers
Efficient procurement can reduce landed cost by 8–15% and cut lead times by 30–40% when done systematically.
- Forecast 2 quarters ahead — align orders with the October–May paving window
- Consolidate volumes to reach 200+ MT per order for better freight rates
- Negotiate CIF Phuentsholing terms to shift freight and insurance risk to the supplier
- Maintain 15–20% buffer stock at site to absorb monsoon delays
- Lock prices with forward contracts when crude benchmarks are low
- Use drum-packed shipments for interior sites; bulk for large highway packages
- Verify supplier accreditation — ISO 9001, NABL COA capability, prior Bhutan experience
| Order Type | Order to Border | Border to Site | Total |
|---|---|---|---|
| Drum, Phuentsholing | 7–14 days | 1–3 days | 8–17 days |
| Drum, interior | 7–14 days | 3–7 days | 10–21 days |
| Bulk, Phuentsholing | 10–21 days | 1–3 days | 11–24 days |
| Bulk, interior (large) | 14–30 days | 4–10 days | 18–40 days |
FAQ: Bitumen 40/50 Bhutan
Q1: What is the current price of bitumen 40/50 in Bhutan?
Bitumen 40/50 lands in Bhutan at roughly $500–$600 per MT at Phuentsholing, rising to $560–$680 per MT for interior delivery. Final pricing depends on crude benchmarks, drum vs. bulk packing, and order volume. Bulk orders above 300 MT typically secure the lower end of the range.
Q2: Which grade is better for Bhutan — 40/50 or 60/70?
40/50 is better for mid-hill and general highway work in Bhutan, offering strong rutting resistance on heavier traffic. 60/70 performs better in the hot southern plains around Phuentsholing and Gelephu. High-altitude projects above 2,000 m often require 30/40 or polymer-modified bitumen.
Q3: How long does delivery take from India to Bhutan?
Delivery from Indian depots to Bhutanese border points takes 3–7 days in normal conditions, with Phuentsholing fastest at 1–3 days from Siliguri. Interior site delivery adds 3–7 days. Monsoon landslides can extend timelines by 3–10 days, so buffer stock is essential.
Q4: How much bitumen does Bhutan import annually?
Bhutan imports approximately 8,000–12,000 MT of bitumen per year, entirely sourced from India, with 60–70% entering through Phuentsholing. Volumes peak between October and May during the paving season. Hydropower access roads and national highway upgrades drive most demand.
Q5: What documents are required to import bitumen 40/50 into Bhutan?
Required documents include a commercial invoice, packing list, consignment note, Certificate of Analysis (COA), and customs clearance papers. For government tenders, a NABL-accredited lab test certificate is mandatory. Retained samples must be kept for at least 12 months.
Plan Your Bitumen 40/50 Bhutan Shipment with 6Tar
Getting the landed cost right matters — freight, duty, drum packing, and inland transport can swing your budget by 10–20%. Use the 6Tar cost calculator to model your exact Bhutan delivery scenario, compare Phuentsholing vs. Gelephu vs. Samdrup Jongkhar routes, and lock in the most competitive landed price before you commit to a supplier. Start your calculation now and turn bitumen procurement into a predictable, data-backed decision.