R&D
Pasteurization vs. Cold-Fill — Pick One
A practical decision tree based on pH, sugar content, and distribution channel. We make the call on every formulation we run — here's how we think about it.
📖 5 min read
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Good Liquid Bev Co
Every beverage we co-pack lives or dies on its processing decision. Pasteurize it and you get shelf stability, extended distribution reach, and room-temperature retail placement. Cold-fill it and you preserve delicate flavors, live cultures, and a "clean" ingredient story — but you are now chained to refrigerated logistics for the product's entire life. This is not a stylistic choice. It is a fundamental business decision, and the wrong one will cost you.
The Basics: What Each Method Does
Tunnel pasteurization
After the product is canned or bottled, the sealed container passes through a warm water tunnel. The standard target is 140–149°F for a specified time — measured in Pasteurization Units (PUs). The formula is:
PU = time (minutes) × 1.393(T − 60)
Where T is temperature in degrees Celsius. A typical commercial target is 10–25 PUs for beer; high-acid products like kombucha often target 5–15 PUs.
Tunnel pasteurization kills or inactivates pathogenic and spoilage organisms, yielding a product that is shelf-stable at ambient temperature for 12–18 months when properly sealed.
Cold-fill / cold packaging
The product is kept cold throughout — typically below 39°F — from the end of production through the entire distribution chain. No heat is applied. Microbiological stability depends on a combination of pH, sugar content (water activity), dissolved CO₂, and alcohol content rather than thermal kill.
The Decision Tree
How We Make the Call
Question 1Is your product pH below 4.6?
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Below 4.6You pass the FDA's threshold for low-acid beverages. High-acid products have natural microbial protection. Proceed to Question 2.
Question 2Does it contain live cultures that must survive?
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Yes = Cold-fillHeat kills probiotics. If live culture count is part of your label claim or product story, pasteurization is off the table.
No = Either method viable. Continue to Question 3.
Question 3Is ambient (room temperature) retail distribution required?
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Yes = PasteurizeGrocery ambient shelves, food service distribution, and vending require shelf stability.
No = Cold-fill is viable if your pH, ABV, and sugar content provide sufficient hurdles.
Product Type Mapping
✓ Typically Pasteurized
- Hard seltzer (ABV 4–8%)
- Craft beer (canned)
- Fruit juice blends
- RTD cocktails (low ABV)
- Sparkling water with juice
- Non-alcoholic beer
✓ Typically Cold-Fill
- Live-culture kombucha
- Probiotic beverages
- Cold brew coffee
- Unpasteurized juice (HPP or cold-fill)
- Kefir-based drinks
- High-ABV products (14%+)
Edge case — hard kombucha: Hard kombucha is a hybrid. The alcohol (0.5–8% ABV) combined with pH typically in the 3.0–3.5 range provides strong microbial hurdles. Some hard kombucha brands do pasteurize to prevent over-fermentation in the package. If you keep live cultures in your hard kombucha, you must cold-fill and manage ABV creep risk. This is not a both-and situation.
Side-by-Side Comparison
| Factor | Pasteurized | Cold-Fill |
|---|
| Shelf life (ambient) | 12–18 months | Not applicable |
| Shelf life (refrigerated) | 12–18 months | 45–90 days typical |
| Retail placement | Ambient or refrigerated | Refrigerated only |
| Distribution chain | Standard (no cold chain) | Full cold chain required |
| Live cultures preserved | No | Yes |
| Heat-sensitive flavors | Some degradation possible | Fully preserved |
| Capital equipment cost | Higher (tunnel pasteurizer) | Lower (cold room / tank) |
| Distribution cost | Lower (ambient freight) | Higher (refrigerated freight) |
| Retail opportunity | Broad (all channels) | Limited to cooler-door accounts |
The Cold Chain Cost Reality
Cold-fill sounds simple until you price out what a full cold chain actually costs. Every node in your distribution network must be refrigerated:
- Co-packer cold storage: Many facilities charge $0.25–$0.75 per case per month for refrigerated warehouse space.
- Refrigerated freight: Reefer truck rates typically run 25–40% higher than dry van for equivalent mileage.
- Distributor cold storage: Not all distributors have adequate refrigerated capacity. This limits your distributor options to those who specialize in refrigerated beverages.
- Retail cooler placement: You are competing for limited cooler-door slots. Ambient shelf brands face no such constraint.
Margin impact: A brand moving to national distribution via cold chain often finds that refrigerated logistics adds $1.50–$3.00 per case in freight cost versus ambient. At 200 cases per month, that is $300–$600 of recurring margin erosion before you've accounted for higher storage costs.
High-Pressure Processing: A Third Path
High-Pressure Processing (HPP) is worth mentioning as an alternative for products where both pasteurization and cold-fill create problems. HPP uses cold water pressure (87,000 psi) to inactivate pathogens without heat, extending refrigerated shelf life to 60–120 days while preserving flavor and live cultures. The tradeoffs:
- HPP is a toll processing service — you ship your filled, sealed product to an HPP facility, which adds logistics complexity and cost ($0.08–$0.15 per unit)
- HPP still requires cold chain — it extends refrigerated shelf life, but the product is not shelf-stable at ambient temperature
- Not all packaging is HPP-compatible — soft-sided pouches and some cap types cannot withstand the pressure cycle
HPP makes the most sense for juice blends, probiotic beverages, and ready-to-drink products where clean label, live cultures, and extended cold shelf life are all required simultaneously.
How We Make the Call at Good Liquid
When a new brand comes to us with a formulation, we walk through four questions in order:
- What is the product's pH? — We test every batch. Anything above 4.6 requires pasteurization; below 4.6 gives us options.
- What does the label claim require? — "Contains live cultures" or "probiotic" means cold-fill. No exceptions.
- Where does this product sell? — If the brand's target is Whole Foods cooler doors, cold-fill works. If they're going into vending, food service, or club stores, we need shelf stability.
- Can the founder support a cold chain at their volume? — A 200-case/month brand shipping refrigerated product nationally is fighting a logistics battle with one hand tied behind their back. We'll have that conversation honestly before they commit to cold-fill.
Let's Talk About Your Formula
We'll tell you which processing method makes sense for your product and distribution plan before you spend a dollar on production.
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