A practical, airflow-safe method to calculate how many 10 kg IQF cartons fit in a 40’ HC reefer, with pallet vs slip-sheet comparisons, real carton examples, and weight-vs-cube checks for 2026 lanes.
The hook: a load plan you can actually use
We’ve spent years loading Indonesian IQF vegetables for customers who want every last carton without choking airflow. The short version: we consistently fit 1,300–1,900 cartons of 10 kg in a 40' HC reefer on pallets, and up to about 2,000 cartons on slip-sheets, depending on carton size and stacking height. Below is the exact method we use in 2026, with numbers you can adapt in minutes.
The 3 pillars of airflow‑safe, high‑cube reefer loading
- Protect airflow. Respect T-floor channels, front bulkhead clearance, sidewall gaps, and door height line. A few centimeters of gap are non-negotiable for frozen veg.
- Plan by cube, then verify weight. IQF vegetables almost always cube out a 40' HC reefer before hitting max payload. We still verify VGM and axle limits lane-by-lane.
- Standardize carton and pallet geometry. Matching footprints and heights lets you stack higher, reduce voids, and keep gaps consistent for the full trip.
Takeaway: never trade airflow for 1–2 percent more cartons. You’ll lose temperature stability and risk thaw/refreeze.
Step 1: Validate the inputs that make or break your count
Here’s what we confirm before we calculate.
- Container: 40' HC reefer, typical internal dims we see across carriers in 2025–2026:
- Internal length ~11,580 mm
- Internal width ~2,286 mm
- Internal height ~2,557 mm
- Door opening height ~2,495 mm, width ~2,264 mm
- Airflow gaps we apply for IQF at −18°C set point:
- Front bulkhead: 75–100 mm clear of the evaporator/bulkhead grills
- Sidewalls: 50–75 mm each side
- Top: 80–100 mm below ceiling/ducting
- Rear door: keep below the printed red line or maintain ~75–100 mm gap
- Pallet options we actually use:
- 1,000 x 1,200 mm “industrial” pallet. In a 40' HC reefer, this reliably gives 2 pallets across the width and 9 positions down the length. That’s 18 pallets total without crushing the gaps.
- 1,200 x 800 mm Euro pallet. In reefers, you still end up with 2 across by 9 down in most cases. So 18 pallets again. We prefer 1,000 x 1,200 because it wastes less side space.
- Typical pallet height limit including pallet: 2,050–2,300 mm depending on carton stability. We don’t take cargo above the ceiling duct line.
- Carton dimensions for 10 kg IQF vegetable cartons vary. You must measure yours. Two common export examples we see:
- Example A: 400 x 300 x 200 mm
- Example B: 500 x 330 x 190 mm
Takeaway: confirm your exact carton outer dims and true pallet height tolerance before you run numbers. Small changes swing counts by hundreds of cartons.
Step 2: Build the palletized plan, then compare slip-sheets
How many 10 kg IQF cartons fit in a 40' reefer on pallets?
We use a simple three-step calc.
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Cartons per pallet layer:
- Example A (400 x 300 mm footprint): on a 1,000 x 1,200 pallet you get 3 x 3 = 9 per layer.
- Example B (500 x 330 mm): on a 1,000 x 1,200 pallet you get 2 x 3 = 6 per layer.
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Layers per pallet:
- Internal height 2,557 mm minus top gap 100 mm = 2,457 mm cargo space.
- Minus pallet height ~150 mm = 2,307 mm for cartons.
- Example A at 200 mm tall: 11 layers (2,200 mm). Example B at 190 mm: 12 layers (2,280 mm).
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Cartons per container:
- Example A: 9 x 11 = 99 per pallet. 18 pallets = 1,782 cartons. Net product ≈ 17.82 MT.
- Example B: 6 x 12 = 72 per pallet. 18 pallets = 1,296 cartons. Net product ≈ 12.96 MT.
In practice, many 10 kg IQF cartons are closer to Example A than B for footprint efficiency. We also see 400 x 250 x 180–200 mm formats that can push container totals into the 1,900 range on pallets when stability allows 12 layers.
Is slip-sheet loading safe, and how many extra cartons does it add?
Slip-sheet loading is safe for frozen vegetables when you keep the same airflow gaps and use a well-trained push-pull forklift. The win is twofold: you recover pallet thickness and footprint inefficiencies. We typically see an 8–12 percent increase in cartons compared with pallets, assuming identical carton geometry and stack heights.
- Example A slip-sheet estimate: 1,782 x 1.1 ≈ 1,960 cartons.
- Example B slip-sheet estimate: 1,296 x 1.1 ≈ 1,425 cartons.
We only recommend slip-sheets where facilities on both ends are equipped, floor conditions are good, and lane handling is predictable. If you’re unsure, we’ll model it with you and share photos from similar loads. Need a tailored plan? You can Contact us on whatsapp.
Which pallet size fits best: 1,000 x 1,200 or 1,200 x 800?
For 40' HC reefers, 1,000 x 1,200 usually wins. You still get 18 pallets either way, but the 1,000 x 1,200 footprint tends to reduce side voids and makes tie patterns easier with common IQF carton footprints. Euro pallets are fine if your buyer needs them, but don’t expect a higher pallet count.
Takeaway: palletized baseline is 18 pallets. Slip-sheets usually add 8–12 percent cartons if lanes and equipment support it.
Step 3: Weight vs cube, and 2026 lane checks
Will you hit weight limit before cube?
Rarely with 10 kg IQF vegetables. Typical 40' HC reefer max payload ranges 27,000–29,000 kg depending on the box and carrier. Using our examples:
- Example A at 1,782 cartons = 17.82 MT net product, plus pallets and packaging. Well under payload.
- Example B at 1,296 cartons = 12.96 MT net product. Far under payload.
Reality: you usually cube out first. Still do a VGM check with pallet weights and dunnage. In the last 6 months we’ve seen lines and terminals push stricter VGM variance reviews and request photographic evidence of airflow gaps at loading.
Takeaway: if your math shows more than ~2,700 cartons of 10 kg, stop. That’s a weight red flag long before airflow.
Practical answers to the questions we get every week
How high should I stack IQF cartons on pallets?
We like 2,050–2,300 mm including pallet, provided the stack is stable. That usually means 11–12 layers for 180–200 mm tall cartons. Do not load into the ceiling ducting. Maintain the top gap.
What airflow gaps do I need around the bulkhead and sidewalls?
- Front bulkhead: 75–100 mm. Never press cartons against the grills.
- Sidewalls: 50–75 mm. Use corner boards and stretch wrap to keep stacks from bulging into the wall.
- Rear door: keep below the red line or hold 75–100 mm clearance.
- T-floor: don’t bridge channels with loose dunnage. Keep return paths open.
Can I mix different carton sizes or SKUs?
Yes, if the outer dimensions match. If they don’t, segregate by row and keep each row to a uniform height. Place heavier SKUs low. Don’t create “shoulders” that catch air and deform shrink wrap. If you’re mixing, floor-test the pallet pattern before load day.
Can I mix pallets and slip-sheets in one container?
Technically yes, but it complicates unloading and usually wastes cube. If you must, put slip-sheets at the nose and pallets nearest the doors, and keep overall stack heights equal for airflow.
What tie pattern works best for IQF cartons?
We’ve found a light interlock pattern for perimeter stability with column-stacked cores works well. It balances vertical compression strength with side stability. Always add corner boards and at least three full-height stretch-wrap passes.
Common mistakes that ruin good reefer loads
- Blocking the bulkhead. Pushing pallets into the evaporator is the fastest way to get hot spots.
- Overfilling the width. Cartons pressed tight to sidewalls collapse airflow. Leave that 50–75 mm.
- Chasing one more layer. A 13th layer that touches the ceiling duct can cost you product. We stop at the safe height for the carton.
- Mixing carton footprints randomly. Voids multiply, loads shift, airflow breaks. Standardize or segregate.
- Ignoring door geometry. The upper door frame can clip tall pallets. Keep the rear stacks slightly lower or use top caps.
Takeaway: it’s almost never a freight-rate problem. It’s an airflow geometry problem.
Where our Indonesian products fit into this
For buyers planning 2026 programs with Indonesian IQF, our frozen range is built around these load realities. Blends like Frozen Mixed Vegetables, single-ingredient items such as Premium Frozen Sweet Corn or Premium Frozen Okra, and processed peppers like Frozen Paprika (Bell Peppers) - Red, Yellow, Green & Mixed are all available in export-ready 10 kg cartons with consistent dimensions. That consistency is what lets us deliver repeatable 40' HC load plans season after season.
If you’re sourcing fresh for processing at destination, our fresh portfolio, including Carrots (Fresh Export Grade), Premium Frozen Edamame for IQF programs, or color components like Purple Eggplant, can be aligned to your packing formats so your reefer plan works from day one. Want a carton drawing matched to your SKU? View our products and ping us with your target carton size.
Final checklist you can use on load day
- 18 pallets in a 40' HC reefer, 1,000 x 1,200 preferred. Slip-sheets add roughly 8–12 percent cartons if both ends can handle them.
- Confirm carton footprint and height. Calculate layers and total before staging.
- Hold the gaps: 75–100 mm front and rear, 50–75 mm sidewalls, 80–100 mm top.
- Don’t exceed door height. Keep last row slightly lower if needed.
- Verify VGM and route weight limits even if you cube out first.
- Photograph the bulkhead gap and first two rows for your records. Carriers are asking more often in 2026.
If you’d like us to blueprint your exact 40' HC plan with your carton spec, we’re happy to share a layout and stability notes based on similar lanes we run every week. Questions about your project? Call us.