Packaging
Bottle pressure management
Matching the pressure a carbonated cider will actually generate to glass that can contain it, taking account of temperature and of any fermentable sugar left in the bottle.
Also called pressure rating, bottle strength selection.
- Stage
- Packaging
- Traditional in
- No single tradition — used wherever it suits
- What it most changes
- Carbonation
- Safety
- Carries a safety consideration — see below
A bottle that exceeds its pressure rating can rupture, and it does so explosively, sending glass fragments some distance with enough energy to cause serious eye and skin injury. Use glass rated for the pressure the cider can actually reach, not glass that merely looks strong: still-wine bottles and many decorative bottles are not pressure-rated and must never be used for a cider that will carbonate. Bottle only when residual fermentable sugar is known and controlled, since an unmeasured ferment continuing in the bottle has no upper limit. Store carbonated bottles cool and stable, because warming raises headspace pressure sharply. Wear eye protection when handling, moving or opening suspect bottles, keep them upright and away from the face and body, and if a batch is suspected of over-pressure, chill it thoroughly before touching it, contain it in a closed crate or box, and vent bottles slowly rather than opening them at room temperature.
What it is
This is the engineering side of bottling anything carbonated. It means knowing how much dissolved carbon dioxide a cider carries or will generate, how much more pressure that gas will exert if the bottle warms, and whether the glass chosen is rated to contain the result with margin. The three container classes ordinarily available differ enormously: a champagne bottle is heavy, thick-walled and punted and is built for high pressure; a beer bottle handles moderate pressure; a still-wine bottle is designed for essentially none. Choosing between them is a safety decision, not a stylistic one.
Why it is used
- It is what prevents a bottle bursting, which is the one failure in cider making capable of causing serious injury rather than merely spoiling a batch.
- It allows a producer to bottle-condition or force-carbonate deliberately to a target rather than hoping the package survives whatever the cider produces.
- It underpins consistency, since a batch bottled without knowing its residual fermentable sugar will vary bottle to bottle in both carbonation and risk.
How it works
- Carbon dioxide partitions between the liquid and the headspace, and its solubility falls as temperature rises, so a bottle taken from a cold cellar into a warm room shows a sharp increase in headspace pressure without a single molecule of gas having been created.
- Any fermentable sugar remaining in the bottle, together with viable yeast, generates further carbon dioxide in a fixed volume, and unlike a dosed priming addition this generation is open-ended: it continues until the sugar is exhausted or the yeast stops.
- Glass containers are rated by design rather than by appearance. Wall thickness, base geometry, the punt, and the finish that accepts the closure all contribute, and a bottle that looks robust may have been designed for a still product.
- Glass fails from surface flaws under tensile stress, so a bottle that has been scuffed on a conveyor, chipped at the finish, or previously filled and washed many times is weaker than its nominal rating suggests, and failure when it comes is sudden and without warning.
- The closure has to match the rating: a cork intended for still wine will be pushed out by a pressure a champagne cork and cage would hold, and a crown applied by a badly set capper will leak or release under load.
What it changes
The direction this step pushes the finished drink in, dimension by dimension. A direction, not a measurement: how far it moves depends on the juice, the temperature and how the step is carried out.
| Dimension | Direction | Why |
|---|---|---|
| Carbonation | Either way | The gas level achieved is a function of how much sugar was available in the bottle and how completely the yeast used it, so control over that variable is what separates a target carbonation from an accidental one. |
The chemistry and the organisms
What is actually being changed, and by what. Each entry says what that compound or organism does in cider generally; this page is one place it does it.
Compounds involved
Carbon dioxide
The other product of fermentation, which protects a cider from air while it is being made and, dissolved in the finished drink, changes both its texture and its perceived acidity.
Glucose
The sugar yeast takes first and the smallest of the three in apple juice, which is why the last sugar left in a slow ferment is almost never glucose.
Fructose
The dominant sugar of apple juice and the sweetest of the common sugars, which is why apple juice tastes sweeter than its total sugar figure implies and why a stuck ferment leaves sweetness behind.
What it is done with
Bottles and pressure: what glass will and will not hold
Sparkling-wine bottles are engineered and tested to hold several atmospheres; still-wine bottles are not engineered to hold any, and filling one with a carbonating cider is the most dangerous ordinary mistake in home cider making.
Counter-pressure filling
Carbon dioxide stays dissolved only under pressure, so carbonated cider poured into an open bottle foams, loses its gas and takes on air; a counter-pressure filler removes the pressure difference by purging and pressurising the bottle first, and vents it under control at the end.
What can go wrong
Faults that begin at this step, or that this step makes more likely. Each one is set out with its causes and whether it can be put right.
Bottle over-carbonation
More dissolved carbon dioxide in the bottle than intended or than the glass is rated for — a presentation problem at the mild end and a physical hazard at the severe one.
Gushing
Cider that erupts from the bottle on opening, either because it is over-pressurised or because something in it is nucleating the dissolved gas violently.
Unwanted refermentation
Fermentation restarting in a sealed container, generating carbon dioxide that was not planned for and pressure that a bottle may not withstand.
Styles it produces
Categories in which this step is characteristic or required. Some name it in their definition; for others it is simply how they have always been made.
Bottle-conditioned cider
Cider that completes a fermentation inside its sealed bottle, generating its own carbonation and, in most cases, leaving a yeast deposit behind.
Sparkling cider
Cider carrying enough dissolved carbon dioxide to produce a persistent bubble, by bottle fermentation, tank fermentation or injection.
Cidre de Normandie
Protected Normandy cider made from the region’s bitter and bittersweet fruit, characteristically low in alcohol, sweet-edged and lightly sparkling.
Bottle-conditioned perry
Perry that completes its fermentation in the sealed bottle, generating carbonation and lees character while the fruit’s sorbitol keeps a sweetness the yeast cannot remove.
Sparkling perry
Perry carrying a persistent bubble, a presentation that suits pear’s aromatics and residual sorbitol and has a documented history going back to the seventeenth century.
Sidra espumosa
Sparkling Asturian cider made by a second fermentation under pressure or in bottle, presented as a fine sparkling drink rather than in the still poured tradition.
More on bottle pressure management
The physics is simple enough to be worth internalising. Dissolved carbon dioxide sits in equilibrium with the gas above it, and that equilibrium moves with temperature: warm the bottle and gas leaves solution, raising headspace pressure steeply. A package that is comfortable in a cool cellar can be near its limit in a delivery van in summer, and the maker has no control over what happens after despatch. Layered on top of that is generation. Priming with a measured sugar addition to a cider that is genuinely finished produces a predictable quantity of gas. Bottling a cider that has merely paused — sluggish, cold-stunned, or apparently dry but still carrying fermentable material — produces an unpredictable quantity, and there is no mechanism by which the bottle limits it.
What a practitioner actually decides is which of three things they are doing. Filling a still cider into ordinary glass requires only that fermentation is genuinely over and stays over. Bottle conditioning to a modest petillant level, as much English and North American practice does, requires a beer-strength bottle with a crown and a known priming addition. Producing a fully sparkling cider — Normandy cidre bouché, a traditional-method cider, a sidra espumosa — requires champagne glass, a champagne cork and a cage, and the same discipline a sparkling winemaker applies. Mixing these up is where accidents come from, and the commonest single error in small-scale cider making is putting an actively fermenting cider into bottles that were never designed to hold it.
Failures announce themselves in a sequence, and recognising the early signs is worth more than any calculation. Bottles that gush on opening, closures that have crept or lifted, sediment stirred by internal turbulence, and unexplained losses in a stored case all indicate that the pressure is higher than intended. At that point the batch, not the individual bottle, is the problem. Chilling greatly reduces the pressure and is the first response; venting slowly and in a contained way is the second; and cutting the risk at source — by filtering, stabilising or accepting a lower carbonation target next time — is the only durable one. Glass gives no warning before it fails, so the margin has to be designed in rather than tested.
Related processes
Steps that sit alongside this one, replace it, or depend on it having been done.
Carbonation
Bottle conditioning
Carbonating cider by letting a second fermentation finish inside the sealed bottle, so the gas is generated where it is going to stay.
Carbonation
Priming
Adding a measured, calculable quantity of fermentable sugar at bottling so that the fermentation which follows generates a predictable volume of carbon dioxide.
Packaging
Closure selection
Choosing between cork, crown, screwcap, cage and swing-top, a decision that fixes how much oxygen reaches the cider, whether it can hold pressure, and which faults it is exposed to.
Packaging
Bottling
Transferring finished cider into glass, where the dominant variable is how much oxygen the liquid picks up in the few seconds it takes to fill and close each bottle.
Stabilisation
Sterile filtration
Membrane filtration at a rating that retains viable yeast and bacteria, which is what allows a sweet cider to be shelf-stable without heat or preservative — provided the filling that follows is aseptic.
Concentration and speciality
Hopping
Steeping hops in cold cider to extract terpene aroma without any boiling, which gives hop character with essentially none of the bitterness that hopping contributes to beer.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- How is sparkling cider made
- What is priming sugar — Priming sugar is a measured dose of sugar added at bottling so that the remaining yeast produces carbon dioxide inside the sealed bottle. Too much of it is the usual cause of burst bottles.
- Why did my cider bottles explode — Because fermentable sugar was still present, or too much priming sugar was used, and the pressure exceeded what the bottle could hold. Never bottle a cider whose gravity is still falling, and never use bottles not designed for pressure.
- Which bottles are safe for sparkling cider — A bottle intended for sparkling wine is a different object from a still-wine bottle. It is heavier, thicker, has a deep punt to distribute stress, a reinforced neck and finish designed for a crown cap or a mushroom cork, and it is manufactured and tested against a design pressure.
- How do you pour bottle conditioned cider — Stand the bottle upright for a day, chill it, and pour in one continuous movement, stopping when the sediment reaches the shoulder. Some traditions deliberately rouse the sediment instead, and both are defensible.
- What is the difference between french cidre and english cider — French cidre is usually sweeter, weaker and more carbonated, because fermentation is arrested while sugar remains. English cider is more often fermented dry and finished still or lightly sparkling, and is stronger for it.
Where to go next
- How cider is made — The whole sequence, stage by stage, with the choices open at each one.
- Cider science — The chemistry and microbiology the methods on this page rest on.
- Troubleshooting — What goes wrong, how to recognise it, and whether it can be reversed.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
Cider and perry production technical training material
Peter Mitchell / Cider and Perry Academy · reference work · registered as competent for this subject
Searched again on 2026-08-25 and it remains the one printed source here that a bibliographic check cannot fix, because it is not a published work with an edition. It is course material issued to participants of a training programme, so there is no catalogue record to verify, no ISBN, and no lawful public copy. Its state stays `registered` for that reason rather than through inattention.
The New Cider Maker’s Handbook: A Comprehensive Guide for Craft Producers
Claude Jolicoeur, Chelsea Green Publishing, 2013. ISBN 9781603584739 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against the Open Library union catalogue: Chelsea Green Publishing, 2013, ISBN 9781603584739, one edition recorded. That establishes the citation points at a real book in a stated edition, which is what a citation needs and is all it establishes. No copy was opened and nothing is quoted from it. The book itself is in print and not digitised in any open collection; where CiderHQ needs a figure from this territory it uses an accessible research source instead and says so.