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Salad being placed in a stainless steel ES-Line vacuum container next to a LAVA sealer, with fresh vegetables

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5 Things to Know Before You Vacuum Seal Food

Vacuum isn't a preservative, not every food seals raw, and wet, soft or bony food needs a trick: five rules for safer, longer-lasting packs.

GuidesBy LAVA AustraliaPublished Updated 4 min read

The short answer

  • Sealed fresh food still needs the fridge or freezer: some bacteria grow without air.
  • Raw mushrooms, onions, garlic and soft white-rind cheese are better not sealed.
  • Dry and cold in: wet or soft food goes into the freezer for an hour first.
  • Pad bones, label everything, thaw in the fridge.

Five rules

  • 1 · Vacuum is not a preservative Taking the air out slows spoilage, but some bacteria grow without oxygen. Fresh food sealed stays in the fridge or freezer, never on the bench. How long does vacuum-sealed meat keep?
  • 2 · Not everything seals raw Raw mushrooms, onions and garlic, and soft cheeses with a white rind, are better not sealed; broccoli, cabbage and beans are blanched first. Which foods can you vacuum seal?
  • 3 · Dry and cold goes in Pat food dry, let cooked food cool, and give wet or soft food an hour in the freezer, so it keeps its shape and nothing reaches the seal. Sealing soft food
  • 4 · Mind the bones Sharp bones and frozen edges pierce thin film: use 160 micron bags or rolls and pad the bones.
  • 5 · Label, freeze flat, thaw in the fridge What and when on every pack; flat packs freeze and thaw faster; thaw in the fridge with the bag opened, never on the bench.
A glass container with rice, broccoli and beef on a light bench
Cooked food goes in cool, never hot. Photo: LAVA.

And three habits

  1. 1

    Clean seal areaWipe the bag opening before sealing: grease or crumbs there make a weak seam.

  2. 2

    Leave roomAbout 5cm free between food and opening; liquids no more than two-thirds full.

  3. 3

    Check the seamA good seam is even and unbroken; if the bag loosens later, open it and seal again.

LAVA AustraliaOfficial LAVA distributor and vacuum-packaging specialists since 2018.

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Common questions

Is vacuum-sealed food safe at room temperature?

Fresh food isn't: meat, fish, dairy, cooked food and low-acid vegetables need the fridge or freezer, sealed or not. Dry goods such as rice, pasta and coffee keep at room temperature.

Can I vacuum seal hot food?

No: let it cool first. Steam fills the bag and spoils the seal.

Why did my sealed bag lose its vacuum?

Usually a bone pierced it, or the seal area was wet or greasy. Use thicker bags or bone protection, and keep the seal area clean and dry.

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