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Before comparing a frozen-food price, identify the quantity in its denominator. Gross weight includes the packaging. A physical contents weight removes packaging, but the declared net quantity may also exclude an ice glaze or require a particular drained basis under the applicable rules. A thaw-and-drain yield measures a further, method-defined outcome. Those quantities can answer different questions even when they come from the same pack.
A quotation saying “10 kg, 8% glaze” leaves two questions open: whether the 10 kg includes the glaze, and which mass the 8% uses as its denominator. Resolve both before calculating a unit price. Then align the product specification, quantity declaration, packing list and receiving method so that each number has an identifiable meaning.
Begin with the quantity named in the deal
Start with the sale unit. Is the quotation for one inner bag, a carton containing several bags, a kilogram of product on an agreed basis, or a complete shipment? A carton price divided by the marked carton quantity is useful only when that quantity represents the material you intend to compare. The word “carton” alone says nothing about the number of inner packs, packaging mass or treatment of any surrounding medium.
Ask the supplier to write the basis in the quotation itself. For example, a proposed commercial line might describe a carton containing individually identified bags, with the price stated per kilogram on the agreed product-only basis. The actual pack size, applicable quantity rules and measurement method still need agreement. A separate conversation about the basis is easy to lose when someone forwards only the price table.
Conceptual pack separation: identify the packaging and contents before interpreting a weight. This illustration shows no measured quantity or legal declaration.
Keep nominal and observed quantities separate. The nominal quantity is the declared or agreed reference, while an observed result comes from a particular pack or sampling exercise. A shipping document may total nominal quantities; a receiving record may contain measured quantities. Neither should silently replace the other. Give totals a label that explains how they were obtained.
Our first request when a quantity description is unclear is the exact product, pack configuration and destination, followed by the relevant wording from the quotation or specification. “Frozen vegetable” is too broad to select a method. A plain whole vegetable, a compact chopped block and a prepared product containing a sauce may require different questions before anyone starts weighing.
Separate the contents from the declared net quantity
Physical accounting is the starting point: a closed pack contains food and packaging, and may contain other material such as an added medium or ice. Subtracting the correctly determined packaging tare from its gross reading gives the mass remaining inside. That calculation does not, by itself, decide which components may be included in a regulated quantity declaration.
| Quantity | What the number describes | Question to settle |
|---|---|---|
| Gross pack weight | Everything weighed as the specified closed pack | Are outer carton, liners, ties or other materials included? |
| Packaging tare | The packaging removed from the relevant gross reading | Which materials and tare determination belong to this pack? |
| Physical contents weight | The gross reading less the applicable packaging tare | Does it still include a medium or glaze excluded from the declared quantity? |
| Declared net or drained net quantity | The quantity stated on the applicable legal basis | Which destination rule, product scope and verification procedure apply? |
| Application yield | The material retained after a defined preparation step | Which process was used, and what happened to the removed fraction? |
“Product-only” also needs a definition. Water naturally present within fruit or vegetables is part of their physical composition. A drained piece is still wet; it is not dry solids. Removing a surrounding liquid, removing a protective ice layer and drying the food are different operations. Avoid writing a requirement that sounds precise while leaving the actual endpoint undefined.
The packing unit matters during tare work. Subtracting only the outer carton while leaving inner liners in the weighed contents overstates the material remaining after all packaging is removed. Subtracting an outer carton again from an already unpacked bag result does the opposite. Draw the pack hierarchy once, identify the level of each reading, and keep packaging deductions at that level.
Frost is not a measured glaze percentage
A photograph can document visible surface ice, frost, loose crystals or fused pieces. It cannot establish their mass or determine how they formed. A buyer should not calculate an ice deduction from appearance, and a supplier should not treat a photograph of lightly frosted product as proof that a requested quantity basis has been met.
The original photograph records frozen blueberry appearance. Surface frost alone does not identify applied glaze, quantify its mass or establish a shortage.
Use the product description, declared ingredients, process information and the agreed method to investigate what the surface material represents. Ask whether a protective glaze is deliberately applied, whether the product is packed with an additional medium, and how the supplier describes the declared quantity. Record the response against the product and specification version. An answer about another product or another production route does not settle the present one.
The distinction also appears within official methods. NIST Handbook 133, Chapter 2, 2026 includes a used-dry-tare note that treats frost inside frozen-food packs as part of the contents, with exceptions for products tested under its encased-in-ice and ice-glazed procedures. Its ice-glazed procedure addresses seafood, meat, poultry or similar products and uses a different endpoint from its encased-in-ice procedure. This is a reason to identify the applicable procedure, not permission to wash and drain every bag of frozen produce. The chapter also specifies scale verification and sampling steps; a single convenient pack and an unverified scale do not reproduce an official inspection.
If the physical condition raises a separate quality question, keep that observation in the report. Quantity verification does not automatically resolve clumping, appearance or suitability for the intended use. Equally, a visible condition difference does not authorize an arbitrary shortage deduction. The evidence for each conclusion should remain visible.
Check the product and destination rule
Quantity declarations are market-specific. In the European Union, Regulation (EU) No 1169/2011, Annex IX, point 5 requires a drained net weight for solid food presented in a liquid medium and excludes glaze from the declared net weight of glazed food. Its definition of a liquid medium includes specified liquids, including when frozen, where they are adjuncts rather than a decisive purchasing feature. Do not assume that every sauce or other recipe component fits that definition. The regulation also sets responsibilities for food information passing through the supply chain.
The Commission’s guidance in section 2.4.3 of its food-information questions and answers explains that declared net weight and drained net weight coincide for glazed food. It gives “net weight (without glaze)” as one possible indication. That does not mean every unglazed frozen ingredient needs to be thawed and drained for its quantity declaration.
The UK government’s net quantity guidance similarly distinguishes net weight excluding glaze from the net and drained quantities of food packed in a liquid medium. Read its prepacked-food scope and the relevant destination requirements, including the intended channel, before applying a label rule to a wholesale configuration.
In Canada, CFIA guidance on net quantity directs readers to commodity-specific lists and distinguishes consumer and other prepackaged foods. Certain products use edible contents excluding free liquid or glaze, although the words “drained weight” need not appear. Other listed products can use count: frozen corn-on-the-cob is an example. A generic instruction to label every frozen product with the same pair of weight statements would miss these distinctions.
Before artwork approval, record the destination, product category, applicable rule or guidance, required declaration and reviewer. Retain the relevant source version with the approval. If a product goes to more than one market, create a clear approval record for each label configuration; do not rely on a previous label simply because the food looks similar.
Specify the measurement endpoint
A quantity clause should identify what enters the measurement, what may be removed and what must remain when the final reading is taken. The endpoint is particularly important where a method separates an external medium from the food. Uncontrolled thawing, rinsing, pressing or waiting can change what is weighed and therefore change the question the test answers.
For a proposed receiving check, agree the product and lot identity, pack level, sampling procedure, equipment, tare approach, handling sequence and result calculation. Where an official method applies, use its full current procedure and sampling requirements. Where a contractual comparison is being developed, have QA establish a suitable product-specific procedure and describe its limits. A mutually agreed calculation cannot override a mandatory destination requirement.
Keep the measurement equipment identifiable. A displayed decimal place is not evidence that the scale is suitable for the decision. Record its identification, relevant verification status and the working setup. A heavy carton check and a small deduction measurement may have different demands. Confirm that the equipment can resolve the distinction you need before using the result to settle a claim.
The record should also state who performs the check and when. A selected development sample, a pre-shipment inspection and a receiving sample have different commercial contexts. If parties intend to compare results between locations, share the complete method, calculation and reporting fields beforehand. Two reports headed “net weight” are not comparable merely because the units match.
Follow one mass through the calculation
The following invented example separates the arithmetic from the testing method. It assumes that the applicable product-specific procedure has validly established a 0.80 kg glaze deduction. It does not demonstrate how to remove glaze, recommend a glaze level or report an XMG batch.
Suppose the specified closed pack weighs 11.20 kg. Its relevant packaging tare is 0.40 kg, leaving 10.80 kg of physical contents. Removing the assumed, separately established 0.80 kg glaze component leaves 10.00 kg on the example’s product basis. The reconciliation is 11.20 = 0.40 + 0.80 + 10.00 kg. Every component has a name, so the same 0.80 kg cannot be subtracted twice.
Invented mass balance: 11.20 kg gross less 0.40 kg packaging and an assumed, separately established 0.80 kg glaze component leaves 10.00 kg. The chart explains arithmetic; it supplies no test method, glaze limit or batch result.
Now calculate the percentage in two ways. Relative to the 10.80 kg of contents including glaze, 0.80 ÷ 10.80 × 100 is approximately 7.41%. Relative to the 10.00 kg of product excluding glaze, 0.80 ÷ 10.00 × 100 is 8.00%. Both describe the same invented pack. They are different percentages because they have different denominators.
That distinction explains why “8% glaze” is incomplete. If 8% means a fraction of contents including glaze, the remaining fraction is 92%. If it means an addition equal to 8% of product weight, the contents are 108% of product weight. Do not move between these statements by subtracting the same percentage from whichever mass happens to be available.
A reconciliation is also useful when an application trial collects several fractions, but the deductions must keep their identities. A remainder between the starting mass and recovered fractions is an unexplained difference until investigated. It may reflect material retained on equipment, a transfer loss or a measurement problem. Naming all of it “glaze” makes the arithmetic look complete while leaving the evidence incomplete.
Compare quotations with the same denominator
Use a common basis before ranking prices. Assume, solely for arithmetic, that a quotation is 2.00 currency units per kilogram of contents including glaze. If the agreed glaze fraction is 8% of that contents mass, one kilogram contains 0.92 kg on the product basis. The equivalent price is 2.00 ÷ 0.92, approximately 2.174 currency units per product kilogram.
If the same phrase instead means glaze equal to 8% of product mass, one product kilogram corresponds to 1.08 kg of contents. The equivalent price becomes 2.00 × 1.08 = 2.160 currency units per product kilogram. These invented prices are not market quotations. The calculation shows why even a small difference in wording can change the comparison.
If the supplier already quotes per kilogram excluding glaze, do not adjust that price again for glaze. Verify that the quantity basis is also consistent in the pack description and invoice calculation. A transparent quote can state the price basis alongside the nominal product quantity and separately describe the surrounding material where relevant.
Keep the cost components comparable. Freight, insurance, duties, taxes, pack configuration and delivery terms can change the landed total, but a correction for one should not conceal a change in another. Keep the original quotation and show each adjustment separately. This allows a second buyer to reproduce the comparison without asking which assumptions were embedded in the final figure.
Also distinguish a quantity correction from a quality judgment. Two offers can have the same equivalent product price while differing in form, usable piece distribution or suitability for the recipe. Once the quantity bases match, compare the remaining specification and application requirements on their own evidence.
Keep application yield in its own trial
A drained-yield trial asks what remains after an identified preparation step. For spinach, a compact frozen block may produce a different handling result after the kitchen’s thawing, draining or pressing process. The starting block photograph establishes its form; it does not establish the retained mass or show that the initial quantity declaration was wrong.
These frozen spinach blocks show the starting form only. A later drained or pressed yield depends on the defined preparation and cannot be inferred from this photograph.
State whether the process keeps the liquid. In a preparation that incorporates it, discarded-liquid yield may be the wrong purchasing measure. In a process that removes it, the retained amount may affect ingredient cost. The trial should follow the actual use and preserve the treatment given to every sample, rather than borrowing a legal quantity-test name for a different procedure.
For a detailed example of controlled application testing, see our frozen strawberry drip-loss comparison guide. Its thaw-and-drain trial connects sample preparation, collected liquid and retained fruit. That result should not be substituted automatically for a legally defined net quantity or an agreed glaze measurement.
Keep two results when two decisions matter: quantity verification for the purchased pack, and yield or performance under the intended process. Give each its own method and acceptance criteria. A product may satisfy one requirement while leaving the other unresolved; combining them into one unlabeled percentage makes that distinction harder to see.
Make the receiving record resolve the disagreement
A useful receiving record connects the observed quantity to the order, the exact pack and the procedure used. Record the lot, sampled pack identifiers, nominal statement, units, gross and tare values where relevant, any method-defined deduction, final result, individual observations and calculation. Attach photographs of the pack statement and the tested material without treating photographs as a substitute for the readings.
Conceptual comparison of two measurement purposes. Each needs its own suitable method and identified portions; the illustrated apparatus is not a prescribed legal test or a measured production result.
When a result differs from the supplier’s report, compare the definitions first. Check whether one party weighed a complete carton and the other weighed inner packs, whether both removed the same packaging, and whether the reported quantity already excludes the component being deducted. Then compare sampling, handling, equipment and calculation. This order of review can reveal a basis mismatch before anyone assumes a short fill.
Preserve individual results and the original record. An average alone can hide which packs differed and whether a particular handling step caused the problem. If a repeat is justified, identify the question it will answer and retain the first result alongside it. Do not reclassify an inconvenient reading as a different quantity after seeing the outcome.
Agree the commercial review path before shipment: who receives the evidence, who evaluates method suitability, what further information is needed and how the affected lot is controlled while the issue is open. Apply the relevant sampling and acceptance rules to the complete record. This article’s arithmetic examples provide no universal shortage allowance or automatic release decision.
The final reconciliation should be understandable without the person who performed it standing beside the spreadsheet. A reviewer should be able to trace the declared basis, original reading, deductions, method and disposition. When those links are present, the disagreement becomes a specific question that can be investigated instead of an argument over the word “net.”
Confirm the pack and specification with XMG Food
We supply frozen fruits, vegetables and mushrooms through long-term partner factories in China. We coordinate unit fill and carton configurations through our packing review, connect quantity requirements to the product specification and sample discussion, and keep approved pack versions tied to the order. Applicable facility checks and destination label responsibilities are confirmed for the selected supply option.
Send the product and form, pack configuration, proposed quantity basis and destination. We will review the supply and packing requirements, identify measurement fields needing agreement and coordinate the next product-specific steps.
References
EU food-information regulation, Annex IX; Commission interpretation, section 2.4.3; GOV.UK net quantity guidance; CFIA net quantity guidance; NIST Handbook 133, 2026, Chapter 2. These references retain their own jurisdiction and product scope. Accessed 11 September 2026.
