What is freeze drying, and how does it work?

Freeze drying, or lyophilization, removes about 99% of water whilethe food stays frozen, turning ice directly into vapor under vacuum. That preserves structure, color, flavorand about97% of nutrients. A typical cycle runs 20 to40 hours.

How long does freeze-dried food really last?

Sealed properlyin high-barrier packagingwith oxygen absorbers,25+ years is realistic. Store it below70 degrees F(21 C], dark, and dry. After opening, expect about1 to3 weeks unless you reseal it well.

What is the difference between freeze dryingand dehydrating?

Dehydrating uses warm air, about140 F, which cooks the foodand leaves it leathery, removing about80% of water. Freeze drying uses cold, along with vacuum instead, removing about99% of water whilekeeping texture, colorand far more nutrients, and enabling decades of shelf life.

What foods can be freeze-dried?

Fruits, vegetables, full meals, eggs, dairyand even candy freeze dry beautifully. Very high-fat foods like avocado, oilsand fatty cheeses can go rancid, so we usually keep those fresh. We guide you on prep for the trickier items.

How much does professional freeze drying cost?

We price by the tray plus by the batch, not flat per pound. Cycle time guides pricing. For comparison, a home machine runs about two thousand five hundred to five thousand dollars, plus dozens of hours of your time. Cycles run twenty to forty hours. Send us your food plus quantities for a clear quote.

Should I buy my own freeze dryeror use a service?

At steady, high volume, owning a machine can pay back in about1 to3 years. For low, seasonal or testing volumes, a service turns fixed costs into per-batch costsand lets you validate products before investing. Many businesses start with a service, then buy.

How should I package freeze-dried products for retail?

Use high-barrier Mylar, roughly three to seven mil, plus oxygen absorbers, then heat-seal each pouch. Block oxygen, moisture, light, heat, the four enemies. For longer storage, consider a nitrogen flush; clear labels carry storage plus best-before info.

About the Data | Just Freeze Drying

About the Data

This page explains what data Just Freeze Drying collects and records, how measured values differ from calculated ones, how missing data is handled and how the Freeze Drying Lab grows. The short version: the Lab is intentionally empty right now, and nothing on this site claims to be test data that does not exist.

What the Site Records

All site data falls into one of these categories, and the categories are never mixed on a published record:

Measured Data

Values read directly from an instrument during a real, documented test: weights from a scale, times from the machine clock, temperatures from a probe. Measured data is recorded as it happens and never estimated afterward. No measured data is published on this site yet, because no test records exist yet.

Calculated Data

Values derived by formula from measured or entered inputs: dry yield percentage, water removed, rehydration ratios, packaging weights, batch costs. Calculated results are always labeled Calculated or Estimate and are never presented as raw measurements.

Observed Data

Human notes recorded during or after a run: texture, color, rehydration behavior, powder behavior. Useful practical observations, not instrument readings. Like measured data, no observed data is published yet.

General Guidance

Educational background that is not tied to a specific test or machine: how sugars behave, why packaging matters, how rehydration works. Carries no record and is never represented as Lab evidence.

How Missing Data Is Handled

When a field was not captured, the record says so. The site uses three honest placeholders and never substitutes a zero where a value simply was not recorded:

Not Recorded: the field exists but no value was captured for that test.
Not Tested: the item or condition was not part of the test at all.
Not Applicable: the field does not apply to this product or test.

A missing value is never filled with an invented number, and a partial record is published with its limits stated (the Lab calls this Partial or Limited Data, described on the Lab Methodology page).

Privacy for Client Tests

Client tests carry a privacy level: Public, Anonymized or Private. Public records can be published with full product and process detail; Anonymized records are published with client identity and location removed; Private records stay in the archive and are never published. Client information is never exposed automatically, and proprietary recipes, ingredient ratios, pricing and identities are never disclosed without the client's specific written approval.

How Historical Tests Are Treated

Historical tests are treated like any other record: they are only published if a genuine source record exists behind them, their completeness is stated honestly and their measured, calculated and observed values stay in their own categories. A historical test with missing fields is published, if at all, as a partial or limited record with exactly those gaps named. Corrections follow the Corrections page: a corrected measurement is fixed in place, never deleted.

How the Lab Will Grow

The Freeze Drying Lab is currently and intentionally empty. No WeFreezeDryIt test records are published because none exist yet as verified, documented records, and nothing is fabricated to fill the space. As real records are migrated and verified, the Lab will grow record by record, each one carrying its own identity, its data categories and its confidence level.

Until then, everything else on this site is general guidance, manufacturer guidance, calculations or estimates, labeled accordingly. You can see the labels in action on the Methodology page.

Editorial & Trust Pages

How this site is created, reviewed, corrected and kept honest.

About Editorial Policy Methodology Corrections Authors About the Data How We Test

Prepared by: Just Freeze Drying Editorial Team Evidence: General Guidance (Data handling document)