Why samples come in stages
A container program asks several questions in turn. Does this shape and capacity suit the food and the channel? Does the lid fit and hold? Does the print look right on the real part? Does a new tool make parts to the drawing? Will the production lot match the approved part? One sample cannot answer all of these, and trying to answer them at once usually means changing several things after the order. Staged samples keep each decision small and reversible until the golden sample is signed.
Stage 1: stock samples
The first samples are stock items from partner plants, chosen against the brief. For a takeout program that might be the 500, 650, 750 and 1,000 ml boxes on the 170x115 mm footprint, a round tub and a soup cup; for a fruit program the three-compartment PP tray at 218x188x42 mm and 1,000 ml. Typical reference timing is 3-7 working days from stock, with 5-8 days by express to most destinations.
What to check:
- Outer size and gram weight against the quoted values, with your own caliper and scale.
- Capacity filled to the line you will actually use, not brim-full.
- Lid fit across several pieces, and opening force for your staff or customers.
- A tilt test with water, a fridge or freezer check and a microwave check where the supplier marks the item for it, lid removed or vented where marked.
- How the item stacks in your bags, shelves or display.
Most programs select their range at this stage. Testing real food in real use, for a few days, tells you more than any specification sheet.
It also helps to request two or three candidates for each slot, ideally from different partner plants. Side by side, differences in stiffness, rim feel, clarity and lid snap become obvious in a way they never are on a spec sheet. Record the results in a simple table with weights and test outcomes, so the choice can be explained later and the same criteria apply when a second source is added. Samples that are rejected are kept too, labelled with the reason, because they are useful when a later quote proposes a lighter or cheaper-looking variant.
Stage 2: printed or decorated samples
When branding is added, a printed sample shows the artwork on the actual part: a sleeve on a closed box, a label on a lid in condensation, print on a lid or cup body. Typical reference timing is 7-15 working days. Check position, colour against the proof, adhesion with a tape test, rub resistance and barcode readability. For paper boxes, check the board, creases, glue lines and window film on a sample made with the production die.
Stage 3: sample mold and T1 trial
For a new footprint or a logo in the plastic, the tool maker cuts a mold from the approved drawing. The first parts from that tool are the T1 trial. Typical reference timing is 25-45 days for the sample mold and T1, depending on the item and tool. T1 parts often need adjustment: wall thickness, rim profile, draft angle or gate position. Further trials follow until the parts meet the drawing. Check dimensions against the drawing, gram weight against target, lid fit with mating parts, demolding marks and flash, and the functional tests that matter for the item. See sample molds and T1 trials.
Stage 4: pre-production samples
Pre-production samples come from the production tool, production material and production line, made shortly before the run. They confirm that the plant can reproduce the approved part under normal conditions, not only in a careful trial. For stock items with print, this is often combined with the printed sample. For food contact items, these are the parts sent to a third-party lab for migration testing where the market requires it, so the report describes what will actually ship.
Stage 5: the golden sample
The golden sample is the approved reference for production and inspection. It is signed and dated by the buyer and the desk, and kept in at least two places: one at the plant, one with the buyer or the desk. It carries a label with the item code, material, gram weight, approval date and any agreed tolerances. Every inspection compares the lot against it. When a reorder comes months later, the golden sample is what stops slow drift in wall thickness, colour or lid fit.
The stages side by side
| Stage | Question answered | Typical timing | Key checks |
|---|---|---|---|
| Stock samples | Does the item suit the food and channel? | 3-7 working days | Size, weight, lid fit, tilt, heat and cold use |
| Printed samples | Does the branding work on the real part? | 7-15 working days | Position, colour, adhesion, rub, barcode |
| Sample mold and T1 | Does the new tool make the drawing? | 25-45 days | Dimensions, weight, fit, demolding |
| Pre-production | Can the line reproduce it? | Before the run | Consistency, lab testing where required |
| Golden sample | What will every lot be judged against? | At approval | Signed, labelled, kept in two places |
Common sample mistakes
- Approving a showroom sample that was not made on the production tool.
- Testing only empty containers, or filling to the brim instead of the real fill line.
- Skipping the freezer check on a lid that will be used in cold storage.
- Approving artwork on screen and seeing it on a part for the first time in production.
- Sending the wrong item to the lab, so the migration report does not match what ships.
- Leaving no signed reference, so a later dispute has nothing to compare against.
Sample costs and who pays
Stock samples are usually inexpensive, and express freight is often the larger part of their cost. Printed samples carry a setup, and sample molds carry tool cost, which the buyer pays or spreads across an agreed volume as set out in mold cost and ownership. Lab tests are charged by the lab. All sample terms are written into the program before work starts, together with the order quantity they lead to.
To start with stock samples matched to your brief, send foods, temperatures, capacities and market through the quote form. After approval, the golden sample becomes the reference for pre-shipment inspection.