In agrochemicals the pack does two jobs at once: it contains a measured dose and it disappears into the spray tank with the product. That second job is a film engineering problem, and the formulation inside is what makes it difficult.
Handling concentrated agrochemicals is the part of the job that carries real risk. Measuring out a liquid concentrate or weighing a powder in the field means opening a container, transferring product, and dealing with the residues on the measuring equipment afterwards. A water-soluble pack removes almost all of that: the operator takes a sealed dose pack, drops it into the spray tank, and the film dissolves with the product. No pouring, no rinsing out a measuring jug, no contaminated empty container to dispose of.
The operational benefits follow from that:
PVA film has to survive the product it is holding. This is where agrochemical projects are won or lost, and it is worth being direct about it.
| Fill type | How the film behaves | What it means for the specification |
|---|---|---|
| Dry powders and granules | Most straightforward. The film is doing a containment job with little chemical interaction | Thickness set by pack weight and handling; grade set by the water temperature of the spray tank |
| Water-dispersible granules | Usually workable, but some formulations carry residual solvents or surface-active components | Sample with the exact formulation, not a generic powder |
| Liquid concentrates | Hardest case. Solvent-based concentrates and some surfactant-heavy formulations attack PVA film from the inside | Compatibility is formulation-specific and must be established by testing. There is no shortcut |
| Water-based liquids | Depends on water content and the other ingredients — a wet fill is in contact with the film from the moment it is packed | Needs the longest sampling window and a realistic shelf-life test |
The pattern to notice is that dry is easier than wet, and that a formulation change — a different solvent, a different surfactant package, a reformulation for a new market — can invalidate a film that has worked for years. When a customer reformulates, we re-sample. That is not caution for its own sake; it is the one thing that reliably prevents a production run failing at the filling line.
Agrochemical packs are regulated products, and the printed pack is part of the compliance surface, not decoration. In practice the print carries product identification, dose information, hazard pictograms and a batch or production code.
Water-soluble film prints differently from conventional film, and the honest constraints are worth stating up front:
Send your artwork, or the elements that have to appear, with the enquiry. Print drives tooling and price more than most customers expect, and it is better to design for the film than to discover the constraint after artwork approval.
Two clocks run at once on a filled agrochemical pack: the product's shelf life and the film's. Both matter.
We will tell you what we can support and what needs to be tested by you on the finished pack. Realistic shelf-life data comes from a real storage trial, and we would rather say that plainly than quote a number we cannot stand behind.
One thing we will not do: give you regulatory advice. Pesticide registration, packaging rules and labelling requirements differ by country and change over time. We build the pack to your specification and can support your registration file with technical information about the film — but the compliance position is a question for your regulatory advisor in each market, and it should be settled before artwork is finalised.
With those points we produce samples in a film we believe is compatible, and you test them with the real formulation, in real tank water, at real dose weights. Where the fill is a liquid concentrate, expect to test over time rather than a single afternoon — compatibility problems often appear weeks into storage rather than on day one, which is exactly why we build the sampling stage into the schedule at the start.
The questions buyers ask most about this topic.
No. Dry powders and granules are usually straightforward. Water-dispersible granules are usually workable but need testing with the exact formulation. Solvent-based liquid concentrates are the hardest case because some formulations attack PVA film from the inside. Compatibility is formulation-specific and can only be established by testing with your product.
It is set by two things: the water temperature in the spray tank, and the fill. If the tank water is around ambient temperature a cold-water grade is the starting point; warmer water moves you to a warm-water grade. Then thickness is balanced between dose weight and the dissolving window. We confirm the final grade on samples rather than on paper.
Yes, with constraints. Fine hairlines and very small detail are harder to hold on dissolving film than on laminated film, so pictograms are usually printed at a size and weight that stays legible through the process. Send your artwork elements and the coding requirement with the enquiry and we will tell you what is achievable before artwork is finalised.
It depends on the fill, the storage climate and the moisture barrier around the pack. Dry fills with a sealed carton store well. Liquid fills need a storage trial because internal attack on the film develops over weeks and months rather than days. We will tell you what we can support and what should be tested on your side.
We can provide technical information about the film specification to support your file. We do not provide regulatory advice or interpret local rules, because pesticide registration and labelling requirements vary by market and change over time - that position should be confirmed with your own regulatory advisor before artwork is finalised.
Send your product, bag size and target quantity. We reply with a film recommendation, a sample plan and a quote within one business day.
Chat on WhatsAppor send the form — we reply within one business day
Sainsun PVA