Vacuum Packaging for ASEAN Seafood and Food Export: Barrier, Film and Vacuum Level

Choose the safety barrier before you choose the machine. For raw seafood a vacuum bag is not itself a control — FDA guidance treats reduced-oxygen packaging as something that deletes the spoilage warning your customer relies on, so the exporter picks a barrier first: hold the product below 3.3 °C (38 °F) from packing to consumption, sell it frozen with labelling that keeps it frozen, or build a formulation barrier (pH ≤ 5, salt ≥ 5% water phase, water activity ≤ 0.97). Only then does machine selection make sense — and there, read the vacuum number correctly: the "≤ 200 Pa" on a Chinese quotation is a dry-air figure wet fish at 10 °C will never reach, because the floor is set by product temperature, not by your pump.

The barrier is a purchasing decision, not a QA decision

FDA's *Fish and Fishery Products Hazards and Controls Guidance*, Chapter 13, says why vacuum packaging is a safety question and not only a shelf-life one: "There is an increased potential for the formation of C. botulinum toxin before spoilage makes the product unacceptable to consumers." The organism that matters for ASEAN seafood is *Clostridium botulinum* type E — "the most common form found in freshwater and marine environments" — and "it should be assumed that C. botulinum will be present in any raw fishery product."

Then the number that should change your plan: "The minimum temperature for growth and toxin formation by C. botulinum type E and non-proteolytic types B and F is 38°F (3.3°C)." Chilled chains in Thailand, Vietnam and Indonesia are routinely specified at 0–4 °C — the top of that band sits above the line. Where refrigeration is the only barrier, the guidance is that it "should be maintained below 38°F (3.3°C) from packing to consumption" — not to the port, not to the importer's cold store.

The alternatives are stated just as plainly: products may "be safely marketed frozen, with appropriate labeling"; formulation can substitute using "pH to 5 or below, salt to 5% wps or more, moisture (water activity) to 0.97 or below, or some combination"; and for some products, "control of C. botulinum can be achieved by breaking the vacuum seal before the product leaves the processor's control."

Read that last one as a buying instruction. If you cannot demonstrate sub-3.3 °C all the way to the consumer and are not selling frozen, a full vacuum on raw chilled fish may be the wrong package — and the budget belongs in freezing and cold storage, not a larger vacuum machine.

Your product temperature sets the vacuum floor, not your pump

Two machines in this category on our site publish an ultimate vacuum — what a supplier should disclose: the [Continuous Stretch Film Vacuum Packaging Machine](/en/products/ali-store-continuous-stretch-vacuum-packaging-machine) states ≤ 200 Pa, the [Single-Chamber Vacuum Packaging Machine](/en/products/ali-store-plastic-automatic-220v-110v-electric-provided-vacuum-sealer-food-single-chamber-) states 1 kPa. On paper, a five-fold difference. Over wet seafood it is usually academic.

Edwards, whose oil-sealed rotary-vane pumps are the standard type in this equipment class, gives the rule: "If vapour is being pumped, the vacuum pump's ultimate pressure will be limited, not by ultimate pressure performance of the pump itself, but by the vapour pressure of the material being processed."

Free water on a fillet is exactly such a material. Water's saturation vapour pressure is 611 Pa at 0 °C, 873 Pa at 5 °C, 1,228 Pa at 10 °C, 2,339 Pa at 20 °C and 4,246 Pa at 30 °C. Against the quoted 200 Pa: at 10 °C the floor is about six times the rated figure (1,228 ÷ 200 ≈ 6.1); in a 30 °C hall, roughly twenty-one times.

Three consequences, each costing money:

• **Cycle time.** If your machine runs to a pressure setpoint rather than a timer, an unreachable setpoint means the pump pulls until it times out. A [Double-Chamber Vacuum Packaging Machine](/en/products/ali-store-multifunctional-double-chamber-commercial-automatic-vacuum-packing-machine-for-f) rated 1–3 cycles/min gives the bottom of that band.
• **Seals.** At the product's vapour pressure, surface moisture boils, lifting free liquid toward the seal bar. Liquid trapped between two film layers is the classic channel leak — a seal that looks continuous and is not.
• **Where to spend.** Chilling before the machine buys more vacuum than upgrading the pump: product at 0–2 °C puts the floor near 600–700 Pa, while the same fish at 20 °C cannot go below roughly 2,300 Pa whatever you paid. That is the cheapest argument for sizing chilling ahead of packaging — see our [cold storage guide for Thai food exporters](/en/news/cold-storage-equipment-thailand-food-export).

The same physics governs pump sizing. Datasheet pump figures are displacement — 100 m³/h on the stretch machine, 20 × 2 m³/h on the single-chamber unit — which says how fast the chamber empties of air, not how much water vapour it can swallow without ruining its own oil. That is a separate published figure: "Vacuum pumps are quoted with a Maximum Water Vapour Handling Capacity, usually in grams/hour." Datasheets in this class generally stop at displacement and ultimate vacuum, so ask for **vapour capacity in g/h**, a wet-duty oil-change interval, and whether a **gas ballast** is fitted — it "should generally be run all the time that vapour is being passed through the vacuum pump," because "condensed water vapour can also degrade an oil sealed rotary vane pump oil quite quickly."

The spec deciding whether you have a reduced-oxygen package is on the film

FDA sets a hard line: "Packaging that provides an oxygen transmission rate (in the final package) of at least 10,000 cc/m2/24 hours at 24ºC can be regarded as an oxygen-permeable packaging material for fishery products," a rate that "is listed in the packaging specifications that can be obtained from the packaging manufacturer."

Read backwards, that is the boundary between two regulatory situations. Above it your package is oxygen-permeable and aerobic spoilage still warns the consumer; below it you are running reduced-oxygen packaging and owe a documented botulism control. Your machine supplier cannot tell you which side you are on, because the film is not theirs. Ask the film maker for the OTR of the finished package, not of the resin.

Thickness is a separate question, and it decides punctures. The stretch-film machine runs forming film at 0.12–0.30 mm and lidding film at 0.08–0.12 mm — 4.7 to 11.8 mil and 3.1 to 4.7 mil, at 25.4 µm per mil. With bone-in cuts and shell-on crustaceans the forming web survives sharp edges; the lidding web usually does not. Specify both separately and qualify against your worst product.

Match the architecture to the product, then to the volume

Three architectures dominate quotations to ASEAN seafood plants, and their published rates are not comparable until converted:

| Architecture | Published rate | Converted | |---|---|---| | Double-chamber, manual load | 1–3 cycles/min | 60–180 cycles/h, several bags each | | Continuous stretch-film thermoformer | 200–400 cycles/h | 3.3–6.7 cycles/min, a web of cavities each | | Automatic bag-feeding | 35–50 bags/min | 2,100–3,000 bags/h, one at a time |

Chamber machines suit mixed pack sizes and small export lots; the double-chamber unit offers 400–1,000 mm seal lengths, 304 stainless chambers, and optional gas flushing at roughly 99% substitution — relevant if your barrier points toward modified atmosphere rather than full vacuum. Thermoformers suit one SKU at volume but lock you into two film webs and a forming depth. The [Automatic Bag-Feeding Vacuum Packaging Machine](/en/products/ali-store-electric-automatic-bag-feeding-vacuum-packaging-machine-for-chicken-steak-corn-p) covers 10–1,500 g fills in 304 stainless.

We do not publish prices for these machines and will not invent one. Browse [vacuum packaging machines](/en/products?category=pm-vacuum-packaging) or discuss a build through [China sourcing](/en/china-sourcing).

What to put in the purchase order

1. The barrier chosen — frozen, sub-3.3 °C, or formulation — in writing; it changes film and machine. 2. Ultimate vacuum **and** the temperature and product it was measured at. 3. Pump vapour capacity in g/h, gas ballast fitted, wet-duty oil-change interval. 4. Forming-film and lidding-film thickness separately, plus a puncture test on your worst product. 5. Finished-package OTR from the film supplier, in cc/m²/24 h at 24 °C. 6. Seal bar width, seal temperature, cooling time, and a leak-test protocol accepted at FAT. 7. Utilities — the forgotten line item. The stretch machine alone needs ≥ 0.6 MPa at 0.8–1 m³/min of compressed air plus 12 kW (8 kW heating) on 380 V three-phase; size the [air compressor](/en/news/air-compressor-sizing-guide-asean) before signing.

Conclusion

Barrier first, film second, machine third. Get the order wrong and you buy a faster machine to solve a cold-chain problem. Our [food inspection guide](/en/news/food-inspection-metal-detector-xray-asean) covers the downstream check; to review a quotation, [contact us](/en/contact).