The carbon math of reuse
Every number we publish about emissions comes from this calculation. Here it is in full — the inputs, the factors, the arithmetic and the things we deliberately leave out.
Need this for a disclosure?
Ask for a diversion certificate for your own batches — a measured document beats a published estimate.
Tell us what you have.
We will tell you what it is worth.
Buying, selling, washing, hauling or recycling — one form covers all of it. Replies come from a specialist in York, PA, by email, inside one business day.
Prefer plain email? Write to info@ibctotesreco.com — include your ZIP, quantity and what the totes last held.
A new 275-gallon composite IBC is about 410 lb CO₂e cradle to gate. Reconditioning an existing one is about 34 lb — roughly 8%. Rebottling is about 182 lb. The reason is that almost all of a container's footprint is spent making its shape: 118 lb of virgin HDPE and 62 lb of galvanised steel, before it has held a single gallon. Washing preserves the shape; recycling destroys it and pays to make it again.
Step 1 — what a new container is made of
A standard 275-gallon composite IBC with a steel pallet weighs about 137 lb empty. The bill of materials breaks down roughly as:
- 118 lb virgin natural HDPE — the blow-moulded bottle.
- 62 lb hot-dip galvanised steel tube — the cage.
- 44 lb steel pallet (composite 31 lb, timber 38 lb).
- ≈ 3 lb valve, lid, gaskets and cap.
That exceeds the 137 lb tare because the tare figure is for the whole assembled unit with a steel pallet, and the component weights above are nominal dry masses before trimming and assembly losses. For the calculation we use 118 lb of resin entering the mould and 106 lb of steel entering the cage and pallet.
Step 2 — the emission factors
We use mid-range published figures for North American production. Published values vary by 20–30% depending on source, allocation method and electricity mix, which is why we publish the inputs rather than just a headline number.
- Virgin HDPE resin production: ≈ 1.8 kg CO₂e per kg.
- Hot-dip galvanised steel: ≈ 2.5 kg CO₂e per kg.
- Blow moulding energy: ≈ 0.4 kg CO₂e per kg of part.
- Cage fabrication and assembly: ≈ 0.3 kg CO₂e per kg of steel.
- Mechanical HDPE recycling: ≈ 0.5 kg CO₂e per kg processed.
Step 3 — the new-unit total
118 lb of HDPE is 53.5 kg. At 1.8 kg CO₂e/kg that is 96 kg CO₂e, plus 0.4 for moulding gives about 118 kg — around 260 lb.
106 lb of steel is 48 kg. At 2.5 kg CO₂e/kg that is 120 kg, plus 0.3 for fabrication gives about 134 kg — around 296 lb.
Taking the proportion of cage and pallet steel attributable to a single unit's first life, and netting the assembly and packaging overhead, our working figure for a complete new unit is ≈ 410 lb CO₂e. Reasonable people using different allocation choices will land anywhere from about 340 to about 490 lb; the conclusion does not change at any point in that range.
Step 4 — what reconditioning costs
This part we meter directly rather than model. Per unit through our line:
- Natural gas for water heating, metered per bay per shift and divided by units processed. The dominant term, and it varies by programme — a caustic clean-in-place at 180°F costs roughly four times an ambient rinse.
- Electricity for pumping, the rotating lance, forced-air drying and lighting — on a renewable tariff with a 48 kW roof array covering summer daytime pumping.
- Water: 31 gallons of fresh make-up per unit, plus the treatment load on the settling, flotation and filtration train.
- Consumables: caustic, detergent, new valve, gaskets, lid and cap. The new valve and seals are a real and often-forgotten term — about 3 lb of moulded polypropylene and elastomer per unit.
Averaged across our programme mix, that comes to ≈ 34 lb CO₂e per unit, of which the new valve and seals are around a quarter. Which is a slightly uncomfortable finding: on a reconditioned container, the fittings are a significant share of its remaining footprint, and that is a strong argument for repairing seals rather than replacing containers — the $14 gasket rule.
Step 5 — rebottling, in between
A rebottled unit takes a new 118 lb HDPE bottle — about 260 lb CO₂e of the above — and reuses the cage and pallet entirely, avoiding the roughly 296 lb steel term. Netting the cage straightening, zinc repair and the usual wash and fit-out gives ≈ 182 lb CO₂e, or about 44% of a new unit.
| Input | Quantity | Factor |
|---|---|---|
| Virgin HDPE | 118 lb / 53.5 kg | 1.8 kg CO₂e/kg |
| Blow moulding | 53.5 kg part | 0.4 kg CO₂e/kg |
| Galvanised steel | 106 lb / 48 kg | 2.5 kg CO₂e/kg |
| Cage fabrication | 48 kg | 0.3 kg CO₂e/kg |
| HDPE regrind processing | per kg | 0.5 kg CO₂e/kg |
| Wash water, fresh | 31 gal / unit | Metered |
| Wash gas & electricity | per programme | Metered |
| New valve & seals | ≈ 3 lb | ≈ 8 lb CO₂e |
What is deliberately not in these numbers
Stating exclusions is the difference between a method and a claim.
Freight, in or out
It varies more by lane and load factor than by anything we control, and including it would let us choose flattering assumptions. Work it out for your actual lane — you can measure it better than we can.
Capital goods
The embodied carbon of our buildings, racking, trucks and wash plant is not amortised into the per-unit figures. Including it would raise the reconditioning number somewhat and would not change the comparison.
Downstream service life
We know a bottle has roughly seven honest service lives in it. We do not know what our customers do with them afterwards, so we claim no credit for subsequent reuse.
Regrind displacement credit
Our HDPE regrind displaces virgin resin in somebody else's product, which is a genuine benefit. We do not track where it ends up, so we do not count it. Many published footprints do, and it makes their numbers look much better.
End-of-life burdens
The eventual recycling and residue disposal of a container is not charged against its reuse figures. It is counted in the weight-based diversion figures on the Loop Ledger instead, which is the more honest place for it.
Four of those five exclusions make our numbers worse than they could be made to look. That is deliberate. A figure you can argue with is worth more than a figure you cannot check — and the measured figures are on the Loop Ledger.
Carbon math FAQ
How much CO2 does an IBC tote represent?
A new 275-gallon composite IBC represents roughly 410 lb CO₂e cradle to gate: about 235 lb from 118 lb of virgin HDPE, about 155 lb from 62 lb of hot-dip galvanised steel, and the balance from moulding, fabrication and assembly energy. Reconditioning an existing one costs about 34 lb. Rebottling — new bottle, reused cage — is about 182 lb.
Why is reuse so much better than recycling?
Because recycling recovers the material and destroys the form, and forming is where the energy went. Granulating a bottle means collecting, cutting, washing, granulating, re-pelletising and re-moulding it, and the re-melt itself still carries roughly 0.5 kg CO₂e per kg of material before you have made anything. Washing the same bottle costs a few kilowatt-hours and 31 gallons of water, and you still have a container at the end.
What emission factors did you use?
Roughly 1.8 kg CO₂e per kg for virgin HDPE resin production, roughly 2.5 kg CO₂e per kg for hot-dip galvanised steel, and roughly 0.5 kg CO₂e per kg for mechanical recycling of HDPE. These are mid-range published figures for North American production; different sources will give you numbers 20–30% either side, which is why we show the inputs rather than just the answer.
Why do you exclude freight?
Because it varies more by lane and load factor than by anything we control, and because including it would let us pick flattering numbers. A full truckload of 40 totes moving 200 miles is a very different per-unit figure from one tote moving 1,200 miles by LTL. If freight matters to your calculation, work it out for your actual lane — it is the one part of this you can measure better than we can.
Is this a verified carbon footprint?
No, and we will not imply otherwise. It is our own calculation from metered yard data and published emission factors. The weight-based diversion figures on the Loop Ledger are measurements; these carbon figures are estimates built from stated assumptions. Treat them as directionally reliable and precisely uncertain.
Related pages
Every input, every factor, every exclusion
Published so you can disagree with the calculation specifically rather than generally.
| Route | CO₂e | Fresh water | Virgin resin | Virgin steel |
|---|---|---|---|---|
| New unit | ≈ 410 lb | ≈ 290 gal | 118 lb | 62 lb |
| Rebottled | ≈ 182 lb | ≈ 120 gal | 47 lb | 0 lb |
| Reconditioned | ≈ 34 lb | ≈ 31 gal | 0 lb | 0 lb |
| Repurposed Grade C | ≈ 11 lb | ≈ 14 gal | 0 lb | 0 lb |
| Input | Quantity | Factor or source |
|---|---|---|
| Virgin HDPE resin | 118 lb / 53.5 kg | 1.8 kg CO₂e/kg |
| Blow moulding energy | 53.5 kg part | 0.4 kg CO₂e/kg |
| Hot-dip galvanised steel | 106 lb / 48 kg | 2.5 kg CO₂e/kg |
| Cage fabrication & assembly | 48 kg | 0.3 kg CO₂e/kg |
| Mechanical HDPE recycling | per kg processed | 0.5 kg CO₂e/kg |
| Fresh water per wash | 31 gal / unit | Metered |
| Natural gas, water heating | per programme | Metered per bay per shift |
| Electricity | per unit | Renewable tariff + 48 kW array |
| New valve, gaskets, lid | ≈ 3 lb | ≈ 8 lb CO₂e |
| Year | Units in | Diversion | Manifested | Notable change |
|---|---|---|---|---|
| 2019 | 19,400 | 88.2% | 11.8% | Closed-loop water train commissioned |
| 2020 | 26,800 | 90.6% | 9.4% | Food line run six days a week |
| 2021 | 24,100 | 92.4% | 7.6% | Upcycled builds workshop opened |
| 2022 | 27,300 | 94.1% | 5.9% | Lease pool launched |
| 2023 | 29,600 | 96.1% | 3.9% | Diversion certificates formalised |
| 2024 | 31,200 | 96.8% | 3.2% | Stainless stream added |
| 2025 | 33,900 | 97.4% | 2.6% | Sludge dewatering upgraded |
What the arithmetic implies in practice
If forming is where the carbon goes, then everything that keeps a container in its formed shape wins — which is why the tables below belong on this page.
Service life by exposure — covering a fleet is the cheapest carbon intervention available
| Exposure | Realistic life | Note |
|---|---|---|
| Indoors, dry, no direct sun | 10–15 years | The bottle outlives most process changes |
| Indoors, skylights / direct sun | 8–12 years | Rotate the containers occasionally |
| Outdoors, fully covered | 9–14 years | A cover is the highest-return intervention there is |
| Outdoors, shaded north side | 7–10 years | Orientation matters as much as cover |
| Outdoors, partial sun | 5–7 years | One face chalks before the other |
| Outdoors, full sun | 3–5 years | Chalky, boardy wall; sudden failures |
| Outdoors, full sun + freeze cycles | 2–4 years | The worst combination we see |
Failure modes — six of ten are handling, not wear
| Mode | Cause | What it looks like | Recoverable? | Prevention | Frequency |
|---|---|---|---|---|---|
| UV embrittlement | Unshaded outdoor storage | Chalky, boardy, higher-pitched tap | No | Cover or shade it | Most common |
| Stress whitening at the radius | Over-fill, freeze, uneven ground | White crackled lower corners | No | Level pad, respect max gross mass | Common |
| Plasticisation & ghosting | Pigment, resin, solvent absorption | Permanent shadow when backlit | Rebottle | Match chemistry to material | Common |
| Freeze damage | Left full and sealed | Bulged panel, split seam, blown boss | Sometimes fittings only | Drain or 2/3 fill, vented lid | Seasonal spike |
| Valve boss cracking | Unsupported pump or rigid pipe | Star crazing at the boss root | No — rebottle | Support the pump separately | Avoidable |
| Impact puncture | Forklift tine, drop, collision | Hole or deep gouge | No | Handling discipline | Rare |
| Cage racking | Soft ground, foot impact, over-fill | Diagonals differ by > 1/2" | Jig if under 1/2" | Level load-bearing pad | Common |
| Weld node cracking | Fatigue, previous field weld | Rust bloom then crack | No | Never field-weld a cage | Occasional |
| Pallet rot / delamination | Timber base outdoors | Soft bearers, split deck | Replace base | Specify steel or composite | Very common |
| Seal failure | Compression set, wrong elastomer, reuse | Weeping at the boss or lid | Yes — new seal | Replace at every product change | 71% of reports |
Pallet bases — the component that lasts and can be repaired wins
| Factor | Steel | Composite | Timber |
|---|---|---|---|
| Typical weight | ≈ 44 lb | ≈ 31 lb | ≈ 38 lb |
| Outdoor life | Indefinite with zinc repair | Good, UV-dependent | 2–4 winters |
| Forklift tolerance | Excellent | Fair — decks crack | Fair — bearers split |
| Pallet-jack entry | Four-way, usually | Four-way, check depth | Often two-way only |
| Repairable | Yes — welded, re-zinced | No | Partly |
| Washability | Good | Excellent | Poor |
| Pest / splinter risk | None | None | Real |
| ISPM-15 on export | Not applicable | Not applicable | Required |
| Hygiene-sensitive use | Acceptable | Preferred | Avoid |
| Cost new | Highest | Middle | Lowest |
| Replacement rate at our bench | Low | Low–moderate | Highest by far |
| Our default on rebottled units | Yes | On request | No |
Seal selection — a $14 gasket against a replacement container
| Medium | EPDM | Viton (FKM) | Silicone | PTFE | We would fit |
|---|---|---|---|---|---|
| Water, potable & process | Excellent | Excellent | Excellent | Excellent | EPDM |
| Dilute acids (<10%) | Good | Excellent | Fair | Excellent | EPDM |
| Concentrated acids | Poor | Good | Poor | Excellent | PTFE |
| Caustic soda, alkalis | Excellent | Fair | Fair | Excellent | EPDM |
| Liquid fertiliser, UAN | Excellent | Good | Fair | Excellent | EPDM |
| Glycols, coolants, de-icer | Excellent | Good | Good | Excellent | EPDM |
| Surfactants, detergents | Excellent | Good | Good | Excellent | EPDM |
| Edible oils, fats | Poor | Excellent | Poor | Excellent | Viton |
| Mineral oils | Poor | Excellent | Poor | Excellent | Viton |
| Aromatic solvents | Poor | Excellent | Poor | Excellent | Viton |
| Chlorinated solvents | Poor | Good | Poor | Excellent | Viton / PTFE |
| Ketones (acetone, MEK) | Fair | Poor | Poor | Excellent | PTFE |
| Alcohols | Good | Good | Good | Excellent | EPDM |
| Fuels, diesel, kerosene | Poor | Excellent | Poor | Excellent | Viton |
| Juice & syrup concentrate | Excellent | Excellent | Excellent | Excellent | FDA EPDM |
| Brine, pickling liquor | Good | Excellent | Fair | Excellent | Viton |
| Hot fill 140–180°F | Fair | Excellent | Excellent | Excellent | Viton / silicone |
| Hydrogen peroxide (dilute) | Good | Fair | Fair | Excellent | EPDM / PTFE |
| Sodium hypochlorite | Good | Good | Fair | Excellent | EPDM |
| Steam / CIP chemistry | Excellent | Fair | Good | Excellent | EPDM |
| Outdoor weathering & ozone | Excellent | Good | Excellent | Excellent | EPDM |
- Freight is excluded. It varies more by lane and load factor than by anything we control, and including it would let us choose flattering assumptions.
- Capital goods are excluded. Buildings, racking, trucks and wash plant are not amortised into the per-unit figures.
- Downstream service life is excluded. We know a bottle has roughly seven lives in it; we do not know what customers do with ours.
- Regrind displacement credit is excluded. We know who takes our HDPE but not what it becomes. Many published footprints do claim this, and it flatters them.
- End-of-life burdens are excluded from the reuse figures and counted in the weight-based diversion numbers instead.
Sixteen datasets, each published in full
Everything this site measures, with the row count and the page it lives on. None of it is behind a form.