Loading a Charcoal Container: Tonnage, SP 978 Stuffing, Incoterms and Transit

By Mohamad Sinno, Charcoal Expert · Reviewed by Budi Hartanto, shipping specialist, 25 years in forwarding as of 2026 · Last updated 3 August 2026

Shipping coconut shell charcoal by sea means loading a UN 1361, Class 4.2 dangerous good, and that changes the plan before the first carton moves. A 20 ft fills to volume before it reaches its weight limit; a 40 ft does the opposite. SP 978 governs the stow, the incoterm decides who declares the goods, and transit starts with whether the lane accepts the booking at all. This is the container-loading layer of shipping coconut charcoal as UN 1361 dangerous goods.

Tonnage and configuration at a glance

A 20 ft coconut charcoal container reaches its volume limit long before its weight limit; a 40 ft reaches its weight limit first. What matters is the payload this cargo actually loads, not the container's rated tonnage. The minimum order is one full container. Tons per container is set mostly by equipment — the 20 ft and 40 ft figures differ by 6.5 to 8 t — and only then by shape, which moves a 20 ft load by about 1.5 t.

Coco Reina's own loaded figures show the split. On a 20 ft: cube 25/26 mm 20 t, cube 27/28 mm 19.5 t, hexagonal, finger and flat/brix 18.5 t. On a 40 ft: 26.5 t, every shape. The 20 ft moves with shape because it fills by volume, so packing density decides it; the 40 ft hits its weight cap regardless. All of it rests on a 10 kg net master carton, identical across shapes — 2,000 cartons of cube 25/26 mm per 20 ft, 1,950 of cube 27/28 mm. A 20 ft is always floor-loaded, no pallets; only a 40 ft takes them, ISPM-15 marked, 100 × 120 cm, 20 per container, though floor loading is preferred there too. Before ordering a 26.5 t 40 ft, check the destination: that is roughly 6.5 t over what a standard US chassis may legally carry — compliant at sea, immovable on the road. The full payload matrix sits on how many tons of charcoal fit in a 20 ft and 40 ft container, by shape.

Why a 20 ft cubes out and a 40 ft weighs out

Charcoal is a low-density cargo, so a 20 ft fills to volume at a weight well under its payload ceiling, while a 40 ft roughly doubles the volume without doubling the weight allowance and runs out of weight first. Worked through on a compliant 20 ft stow, one sourced step at a time:

Even the top of the band, 26.1 t, lands about 2 t under what the box carries at its rating — so the compliant stow runs out of cube before it runs out of payload. This factory's measured 20 t implies about 690 kg/m³ in that usable cube, inside the band rather than at its edge. The band checks a quoted load; it does not predict one. Question any figure above the payload ceiling or the destination road limit.

The container weight ceiling is not the planning number

The "up to 28 tonnes / up to 30 tonnes" figures circulating on generic FCL pages are equipment ceilings. On a 20 ft they are not achievable charcoal loads — the cargo cubes out first. On a 40 ft the cap genuinely binds, and closely: this factory's 26.5 t sits about 230 kg under the ~26,730 kg a 30 480 kg-rated box carries on a typical tare, so the plate on the individual container decides it. What both boxes share is the road gross-weight cap at either end, which often caps a door move below the box rating — 36,287 kg total in the US leaves roughly 19–20 t on a standard chassis (OOCL, 2024), the EU 40 t (44 t for a six-axle combination), the UK 44 t. On a 20 ft a denser cube reaches a higher weight before it runs out of cube, which is why the 20 ft payload is a by-shape question and the 40 ft is not.

Stuffing under SP 978

Under SP 978 the material must be weathered before it is packed and must sit at or below 40 °C on the packing day, and the stow must keep a headspace and a stack-height limit — conditions that consume usable volume before the first carton is loaded. The container stuffing rules for charcoal are carriage conditions set by the cargo's own hazard, not loading tips.

• Weathering: the unpacked material weathers under cover, in open air, for at least 14 days after production before packaging — or takes the steam-and-inert-gas route plus a 24-hour rest (Hapag-Lloyd, December 2025).
• Packing ≤40 °C: packing only when the material does not exceed 40 °C on the day of packing — a stuffing-day ceiling, not an average (Hapag-Lloyd, December 2025).
• Headspace and stack: a 30 cm headspace shall be kept whatever the packing approach; a stow height under 1.5 m, or blocks of at most 16 m³ spaced 15 cm apart, are the guidance's recommended options (SP 978.6 via CINS, September 2024).

On a 20 ft, the headspace worked through above is part of why the achieved payload sits below the equipment ceiling — volume the compliant stow gives up. On a 40 ft it costs volume the load was never going to use, because weight binds first. The step-by-step loading sequence and the numbers behind each rule are unpacked in the stuffing rules for charcoal containers — temperature, headspace and stacking.

The stuffing-day log: what we measure at the container door

This factory treats the stuffing day as a measurement, not a formality. Coco Reina holds its coconut shell charcoal at least 14 days post-production before packing — the SP 978 minimum — and where the raw-material curing and the post-production hold are counted separately, the material has spent at least 28 days from receipt to stuffing. Material temperature is checked each stuffing day at the container door, measured 20–30 °C against the 40 °C ceiling. The load is declared in 4G fibreboard boxes as UN 1361, Class 4.2, Packing Group III — the packaging specification is part of the loading plan, not just the paperwork.

Those readings are also evidence: the packing-day temperature and headspace become the shipper's proof if a carrier or surveyor questions the container later. They travel with the box inside a larger set — DGD, weathering record, MSDS, survey — set out in the DG document stack that travels with the container. To talk through a container plan or this factory's loading and weathering practice: WhatsApp +628213924038.

Incoterms in charcoal practice

For charcoal the incoterm does more than split cost and risk — it decides who is legally the dangerous-goods declarant and who must hold carrier approval, which is why EXW rarely suits a first-time importer of a Class 4.2 cargo. Under FOB, CFR and CIF risk passes when the goods are on board — not "over the rail", dropped from the rules in 2010 (ICC Academy, 2024); under CIF the seller's minimum cover is Institute Cargo Clauses (C) at 110% of value, which excludes loss from the cargo's inherent nature (LMA/IUA CL384, 2009) — the exact boundary a self-heating cargo sits on.

The terms this factory offers are EXW Factory as the default, and CFR on some orders — which puts the dangerous-goods declarant burden on the buyer under the default term. The market itself disagrees on which term family suits containerized cargo, and for a Class 4.2 load that argument turns on who can lawfully declare the goods — the full responsibility matrix and the buyer-maturity guidance sit on FOB, CIF and EXW for charcoal imports and who carries the DG burden.

Time and money on the water

For a Class 4.2 cargo, transit begins with whether the lane will accept the booking at all — so every duration here is a dated indicative band to confirm at booking, not a fixed schedule. Before the box sails, production lead time runs 15 working days for a 20 ft and 20 for a 40 ft. As of July 2026, whether a charcoal container can be booked as dangerous goods is the first question: which ocean carriers accept charcoal and how approval works is the companion subject to transit time from Indonesia.

Indicative Jakarta-origin bands (transshipped unless noted; confirm at booking): North Europe ~25–40 days, Los Angeles ~30–40 days, Nhava Sheva ~16 days direct, Sydney ~15–19 days (iContainers, DSV, Fluent Cargo, Vanguard, 2024–2026). Two live disruptions stretch several of them: most Asia–Europe capacity routes via the Cape of Good Hope, adding ~10–14 days and ~3,000–4,000 nm, and Persian Gulf DG bookings are suspended to the UAE, Saudi Arabia, Iraq, Jordan and neighbours, with Saudi cargo moving via the Jeddah Landbridge (Maersk Middle East Operational Update 40, 22 July 2026). Gulf-market charcoal to Jebel Ali, Dammam or Umm Qasr is largely unbookable as DG right now — status as of July 2026. The full multi-market lane table is maintained on transit times from Indonesia to the major charcoal ports.

When a lane figure expires, and where demurrage starts

Every transit band here carries the date it was checked, because DG acceptance and Red Sea and Hormuz routing change within weeks, not months. Once the box lands, cost moves to free time: demurrage is charged for holding the carrier's container inside the terminal beyond free time, detention for holding it outside — and free time is location-specific, so no universal figure applies (Maersk tariff, 2024). The claim sequence and deadlines are in the demurrage, detention and cargo-claims playbook.

This page is general information on loading and shipping charcoal, not legal, dangerous-goods, or customs advice. Routing, transit and DG-acceptance figures are indicative and time-sensitive — confirm the current position with your carrier or forwarder, and confirm SP 978 requirements with a licensed dangerous-goods specialist, before booking.