Pod film is the hardest water-soluble specification in the range. It has to carry a wet, chemically active fill for months of storage, survive a customer's damp hand, and then dissolve completely inside a wash cycle — and those three requirements pull against each other.
If pod film fails, it is almost always because one of these three requirements has been traded away for another:
Pod film sits at the warm-water end of the grade range — typically 40–60 °C — because that is what most domestic wash programmes actually reach. The engineering interest is in everything else.
Lab dissolution and domestic dissolution are not the same test. Four variables decide what happens in a real machine:
Water temperature at the customer's tap also varies by market and season, from cold groundwater in northern Europe to much warmer supply in other regions. If your product sells across several markets, the film is often specified for the coldest significant market rather than for the average.
Pod film is not judged in isolation. It is judged on a filling machine, and the machine has opinions.
The film passes through a forming and sealing process where the seals are made under heat and pressure (with or without water, depending on the machine type). Three things have to line up:
If you are setting up a new line, tell us the machine model and its sealing parameters during the enquiry. It is much easier to specify film that suits the machine than to tune a machine around a film.
These formats get grouped together, and they are different projects.
| Multi-chamber pod | Single-dose liquid pouch | |
|---|---|---|
| Fill | Two or more compartments, often different formulations that must not mix before the wash | One fill, usually a single liquid or gel |
| Film demands | Compatibility with each fill separately, plus barrier behaviour between compartments | Compatibility with one fill, plus a reliable seal on a simpler geometry |
| Filling line | More complex: forming, filling and sealing in sequence, with tighter tolerance | Simpler converting and filling |
| Typical enquiry | Brand owners with an established product shape looking for film supply | Brand owners, contract packers and industrial users of dosed liquids |
If you are still choosing between the two, the fill chemistry usually decides it. Two components that must stay separate until the wash point towards a multi-chamber pod; a single component with a straightforward dose points towards a pouch, which is cheaper to fill and to seal.
Pod projects are sampled, always, and the sample is tested by the customer rather than approved on the basis of a datasheet.
We start from what you are filling and how it will be washed, produce film samples in the grade and thickness we believe fit, and you run them on your own filling line and in your own wash conditions. Where the fill is a liquid, we also want to see it after realistic storage, because that is when incompatibility shows up.
From there the discussion becomes commercial: the film specification that passed the tests, the packing format for the film rolls, the volumes involved and the delivery schedule. The same front-loaded sampling process runs behind every product we make — you can see how it works in practice for fishing bait bags and agrochemical dose packs as well.
If you are at an earlier stage — still choosing between a pod and a pouch, or still fixing the fill — say so. We would rather help you pick the format that will work than quote a film for a format you will change in three months.
Primary sources for the rules and test methods referred to in this guide:
The questions buyers ask most about this topic.
Pods use water-soluble PVA film in a warm-water grade, typically designed for around 40-60 °C, because domestic wash programmes usually run at those temperatures. The exact formulation and thickness are set by the fill, the storage conditions and the shortest wash cycle the product will be sold into, and are confirmed on samples rather than on a datasheet.
Usually the film is dissolving too slowly for the real wash conditions - cold fill water in the early part of the cycle, hard water, a short programme, or an overloaded drum with poor water flow. Residue is generally a specification issue rather than a batch defect. Tell us the programme temperature, cycle length and water hardness you sell into and we will sample a faster-dissolving film.
It needs to be matched to it. Film is specified to suit the sealing parameters and web handling of your line, and if either the machine or the film changes, the parameters usually have to be re-established. Give us the machine model and its sealing settings during the enquiry so we can specify film that suits the machine rather than the other way round.
It depends on the fill and the storage climate. The film has to contain a wet, active fill for months without softening seals or bleeding, and that compatibility should be established in a storage trial rather than assumed. Retail packing that keeps humidity out also matters, because PVA film is hygroscopic.
Yes. Single-dose pouches use the same warm-water PVA film family but with a simpler geometry and sealing requirement. They are usually cheaper to fill and seal than multi-chamber pods, so if your formulation is a single component the pouch format is often the more economical answer.
Send your product, bag size and target quantity. We reply with a film recommendation, a sample plan and a quote within one business day.
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Sainsun PVA