Carbon dioxide is not a commodity most cold chain operators think about until they can’t get it. Dry ice — solid CO₂ at -78.5°C — is produced from liquid CO₂, which is itself a byproduct of industrial processes including ammonia production, ethanol fermentation, oil refining, and natural gas processing. When those upstream industrial processes slow down, CO₂ supply contracts — and dry ice availability follows.
The 2022 CO₂ shortage in Europe, triggered by unplanned shutdowns at fertiliser plants following the energy crisis, caused dry ice prices to spike by 200–400% in some markets and left pharmaceutical and food cold chain operators scrambling for alternatives. Similar — if less severe — supply disruptions have occurred in the United States and have affected Australian import markets.
For Australian cold chain operators in 2026, CO₂ supply chain risk deserves the same engineering and procurement attention as refrigerant performance data. This article provides a framework for understanding the risk, quantifying exposure, and building operational resilience.
How Dry Ice Is Made: The Supply Chain Starting Point
Understanding CO₂ supply risk requires understanding the production chain. Atmospheric CO₂ is not the feedstock — capturing and purifying atmospheric CO₂ at commercial scale remains expensive and limited in capacity. Industrial CO₂ is captured from high-concentration point sources where it is a byproduct of other processes.
The dominant sources globally are:
Ammonia and fertiliser production: The Haber-Bosch process that produces ammonia generates large volumes of CO₂ as a byproduct. Fertiliser plants are typically the largest single-site CO₂ suppliers globally. When natural gas prices rise (as occurred dramatically in Europe in 2021–2022), fertiliser plants reduce or halt production, eliminating that CO₂ supply.
Ethanol fermentation: Bioethanol production from grain and sugarcane generates CO₂ during fermentation. Australian ethanol production capacity is modest, but it contributes to domestic supply. Seasonal variations in grain harvest and ethanol plant maintenance schedules create predictable supply fluctuations.
Oil refining and gas processing: CO₂ is captured from various refinery processes and natural gas sweetening operations (where CO₂ is separated from methane). Refinery output shifts driven by fuel demand cycles affect CO₂ availability from these sources.
Hydrogen production: Steam methane reforming, currently the dominant hydrogen production route, generates CO₂ as a byproduct. As hydrogen production scales — including in Australia under green hydrogen initiatives — this may add CO₂ supply capacity, but timelines remain uncertain.
The critical insight is that CO₂ production is almost entirely dependent on the economic viability of other processes. It is not produced to meet cold chain demand; it is produced when other things are happening, and cold chain operators access whatever is available.
Australia’s Specific Supply Vulnerability
Australia’s domestic CO₂ supply capacity is limited relative to many other developed economies. The country’s industrial base — while substantial — lacks the density of large-scale ammonia production that characterises CO₂ supply chains in Europe or the United States Gulf Coast. This creates structural import dependence for certain CO₂ grades and makes Australian dry ice supply more sensitive to shipping logistics disruptions than domestic markets in CO₂-producing countries.
Liquid CO₂ is transported by road tanker from production facilities to dry ice manufacturers, where it is solidified and cut or pelletised. The cold chain from liquid CO₂ production to dry ice end-use involves temperature-controlled tanker trucks, storage dewars at manufacturing facilities, and tightly managed inventory. Any disruption in this chain — driver shortages, equipment failure, production outage — propagates to dry ice availability within days.
Australian dry ice manufacturers are concentrated in major metropolitan areas: Sydney, Melbourne and Brisbane account for the majority of production capacity. Remote and regional cold chain operators face compounded risk: not only is the supply chain longer, but the sublimation losses during transport (dry ice sublimes at approximately 1–2% per day under normal insulation) make long-haul dry ice supply economically marginal for small quantities.
Quantifying Your Exposure
The first step in managing CO₂ supply risk is quantifying how much your cold chain depends on dry ice specifically, versus alternative refrigerant options. A practical exposure assessment covers three dimensions.
Volume dependence: What proportion of your cold chain shipments use dry ice packs specifically, and at what quantity per shipment? An operation shipping 500 pharmaceutical units per week at two 400g packs per unit consumes 400kg of dry ice per week. At a moderate supply disruption that reduces availability by 30%, that equates to 120kg per week of unmet demand — enough to potentially halt 150 shipments.
Substitutability: For each application in your cold chain, can a gel pack or PCM alternative achieve equivalent temperature maintenance? dry ice packs at -18°C to -21°C freeze temperature maintain payloads below 0°C — a temperature range that water-based gel packs at 0°C freeze temperature cannot achieve. If your payload requires sub-zero temperatures throughout transit, dry ice is not easily substituted. If your payload requires 2–8°C maintenance, gel packs are a viable alternative.
Lead time sensitivity: How much notice do you currently have of supply shortages? Operations that order dry ice 24–48 hours before use have almost no buffer. Operations with weekly procurement cycles and multi-day on-site storage have more time to identify and respond to supply signals.
Strategic Stock Management for Australian Operators
Dry ice cannot be stored indefinitely — sublimation is constant, and even in well-insulated dewars, solid CO₂ will lose 1–3% of its mass per day. This makes classic safety-stock buffering (hold 4–6 weeks of supply on hand) physically impossible for dry ice specifically.
However, strategic stock management remains feasible through several mechanisms:
Supplier diversification: Most Australian cold chain operators purchase dry ice from a single local supplier. Qualifying a secondary supplier in the same region — even if the secondary supplier charges slightly more — provides immediate access to an alternative source when primary supply is constrained. This is particularly important for operators in markets where total dry ice supplier count is two or three.
Refrigerant substitution protocols: Develop and validate a pre-approved substitution protocol for each cold chain application. If your standard protocol uses dry ice packs, your substitution protocol specifies the gel pack alternative — quantity, freeze temperature, placement — and has been validated (either through temperature logging or ISTA 7D testing) to demonstrate equivalent performance. When dry ice supply is constrained, you execute the substitution protocol rather than halting operations.
Pack density optimisation: Under supply constraints, reducing the number of dry ice packs per shipment while maintaining temperature compliance requires engineering knowledge of your thermal load. A validated thermal model of your shipper configuration — heat ingress rate, refrigerant mass required, ambient temperature range — allows you to identify the minimum viable pack quantity. This prevents panic-buying when supply is tight, and allows you to spread available inventory across more shipments.
Ordering cadence adjustment: Rather than ordering on a just-in-time basis, establish a minimum-stock threshold that triggers a replenishment order at least five business days before depletion. Five days provides enough time to source from an alternative supplier or arrange emergency air freight from a more distant producer if local supply is exhausted.
PCM and Gel Pack Alternatives: When They Work
Phase change material (PCM) packs offer the most technically direct alternative to dry ice packs for many cold chain applications. PCMs are available at a range of target temperatures — 0°C, -5°C, -12°C, -21°C — and can replicate the temperature maintenance profile of dry ice packs in many scenarios.
The key technical distinction is the latent heat capacity. Dry ice has an enthalpy of sublimation of approximately 571 kJ/kg — nearly double the latent heat of fusion of water (334 kJ/kg). This means that on a mass-for-mass basis, dry ice packs can absorb substantially more heat before exhausting their refrigerant capacity. For a fixed-weight constraint in air freight, this is a meaningful advantage.
However, for road and courier freight where weight constraints are less binding, PCM packs at equivalent or higher total mass can achieve comparable temperature maintenance duration. A validated substitution using 600g of -18°C PCM packs in place of 400g of dry ice packs may be thermally equivalent in a 24-hour transit scenario at 35°C ambient — the additional mass compensates for the lower latent heat per kilogram.
This substitution must be validated before a supply emergency occurs, not during one. Temperature logging with data loggers over a representative transit simulation — 24 hours at 35°C ambient minimum for Australian summer scenarios — provides the validation data needed to defend the substitution to a pharmaceutical client, regulatory auditor, or quality manager.
The Regulatory Angle: Supply Disruption and Quality Systems
For pharmaceutical cold chain operators in Australia, TGA Good Distribution Practice (GDP) requirements do not disappear during a supply crisis. If your validated packaging specification calls for dry ice packs and you substitute gel packs without a pre-approved change control process, you have introduced an unvalidated deviation — even if the temperature data subsequently shows the substitution worked.
Best practice is to include supply disruption scenarios in your Cold Chain Management Plan (CCMP) with pre-approved contingency packaging specifications that have been validated. This converts a supply emergency into a routine execution of a documented contingency — which satisfies GDP requirements and keeps your supply chain in compliance even under adverse conditions.
For food cold chain operators, FSANZ temperature control requirements similarly do not carry exceptions for dry ice unavailability. Inability to source dry ice is not a defence for a temperature excursion. Your contingency packaging configuration must be capable of meeting the same temperature standards as your primary configuration.
Signals to Watch in 2026
Several indicators provide advance warning of CO₂ supply tightening. Monitoring these allows proactive procurement adjustment rather than reactive crisis management:
Energy prices: Natural gas price spikes in Australia and major supply markets (particularly Europe and the US) signal potential fertiliser plant curtailments. A 50% rise in natural gas prices is a reasonable trigger to review dry ice inventory and accelerate supplier communication.
Ammonia and fertiliser market reports: CRU Group, ICIS, and similar commodity intelligence providers publish fertiliser market data that reflects CO₂ source production rates. This is not information most cold chain teams access, but procurement teams at larger organisations can integrate it into supply monitoring dashboards.
Supplier lead times: If your dry ice supplier begins quoting longer lead times or implementing purchase limits, that is a direct signal of tightening supply. Establish a relationship with your supplier that includes proactive communication about supply status — not just transactional ordering.
Dry ice price movements: CO₂ and dry ice prices are not published daily like commodity metals, but your supplier pricing history is a useful trend indicator. A price increase of more than 15–20% over a 3-month period typically reflects genuine supply pressure rather than margin adjustment.
Conclusion
Dry ice supply risk is a genuine operational vulnerability for Australian cold chain businesses — one that is easy to ignore during normal market conditions and expensive to discover during a supply crisis. The engineering response is not complex: diversify suppliers, pre-validate substitution protocols, optimise pack density, and monitor supply signals.
The businesses that navigate CO₂ supply disruptions successfully are those that treated supply risk as an engineering problem before the disruption occurred — not those that improvised the best available solution after supply ran out. In a regulated cold chain where every deviation requires documentation and potential revalidation, improvisation is not a compliant strategy.
Build your dry ice contingency into your cold chain management system now, when the planning costs nothing. The alternative is bearing those costs — in operational disruption, expediting fees, and potential quality events — when supply tightens and the pressure is already on.