Start with the material and the intended bag
For a custom PVC bag, approve the single-wall sheet thickness, appearance and feel alongside the finished construction. A photograph and a thickness number leave important questions unanswered: how clearly should the contents show, how should the bag bend, and what condition should it arrive in after packing? Put those answers in the sample brief before comparing quotations.
The Environment Agency’s PVC review distinguishes rigid, unplasticised PVC from flexible, plasticised PVC and explains that additives give the material different properties. The sourcing implication is to identify the proposed sheet grade and finish rather than treating “PVC” as a complete specification.
Use the PVC bag collection to identify a starting style. For a holographic tote or striped tote, specify the visual effect, any liner and the required visibility of the contents. Ask which layers, decoration and trim are included in the quoted construction.
Specify single-layer thickness and how it is measured
Use an explicit unit such as millimetres, and identify the part being measured. For illustration only, 0.40 mm equals 400 µm; this conversion is not a recommended thickness or a LinHord stock specification. The front and back walls pressed together, a folded top edge and a single flat sheet are different measurement locations.
ISO 4593:1993 describes thickness measurement of plastic film and sheeting by mechanical scanning; its published scope excludes embossed material. Ask the supplier or laboratory to confirm a suitable method for the actual surface. Write the tolerance and measurement locations separately from the nominal value; the method name does not supply a bag-specific acceptance limit.
| Field | What to record |
|---|---|
| Material and layer | Sheet reference; single layer; whether a coating or laminate is included. |
| Target and tolerance | Nominal thickness, unit and agreed upper/lower limits. |
| Measurement | Applicable method, instrument conditions and locations away from joins unless a join is the target. |
| Decision rule | Whether limits apply to individual readings, an average, or both; retain the readings. |
Approve clarity, colour and surface appearance separately
Review the proposed material against the same light and dark backgrounds, under agreed lighting, with the same contents behind it. Compare a flat material sample and the assembled bag: overlaps, the liner and printed areas form part of the final appearance. For a holographic effect, record more than one viewing angle; one photograph should not be the only approval reference.
If a numerical haze requirement is needed, agree a suitable optical test. ISO 14782:2021 covers wide-angle light scattering in transparent, substantially colourless plastics, for haze values below 40%. That scope boundary is not an acceptable haze limit for bags. Ask the laboratory about suitability for tinted, holographic, patterned or textured material instead of applying the method automatically.
Record acceptable examples of scratches, specks, cloudy areas and surface waviness, with agreed viewing conditions and inspection zones. A deliberate frosted or striped finish should be compared with its approved reference, rather than judged against an unrelated clear sheet.
Keep a reference for feel and use conditions
Use a retained swatch and a finished sample to describe the desired softness, drape and shape recovery. Compare them after the same agreed conditioning. If the bag will be stored or used in cold or warm conditions, ask for an appropriate evaluation using the proposed material and construction. Agree the conditions, duration and decision criteria; avoid assuming one temperature rating applies to every PVC bag.
Describe any opening, folding or surface-stickiness concern as a repeatable sample check. If an odour requirement matters to the product, agree how samples will be packed, conditioned and assessed. Keep that sensory check separate from chemical testing: a smell description is not a measurement of a named substance.
Check the complete bag, not just the sheet
A material tensile report answers a different question from a carry test. ASTM D882-26 covers tensile properties of plastic films and sheets below 1.0 mm; its overview notes that specimen thickness and test conditions affect results. For a bag order, separately agree finished-bag checks covering handles, attachment points, seams, base and closure.
Confirm whether each join is sewn, welded or made by another agreed process. Inspect exposed edges and the handle reinforcement on the actual sample. Define the intended contents, load, loading arrangement and test sequence before making a carrying-capacity claim. A water-resistance claim also needs a defined finished-bag assessment covering openings and joins; a sheet description alone does not establish it.
For branding, confirm the printed side, artwork size, viewing direction and any backing colour, then evaluate the print on the actual PVC after agreed handling and packing checks. Review the closure guide when deciding usable access and the way the bag closes.
Approve the appearance after packing and unpacking
Ask for a packed sample using the proposed fold, protection and carton arrangement. Agree when to inspect it after unpacking and compare it with the retained reference. Use the packaging guide for carton details. The checks below are project planning suggestions, not universal test conditions or pass limits.
| Area | Question to resolve on samples |
|---|---|
| Fold lines and shape | What creases remain at the agreed review time, and are they within the approved appearance reference? |
| Contact surfaces | Do panels separate as intended, and is there sticking, colour transfer or marking? |
| Print and trim | Are there scuffs, transferred ink or impressions where parts touch? |
| Corners and handles | Are the base, edges and attachment areas intact after the agreed packing and handling sequence? |
Match chemical evidence to the proposed material
The Environment Agency review describes several additive functions and identifies substances for further evaluation. It is a research review, not a product approval or a complete current legal checklist. Specify the destination market and intended users so the supplier and laboratory can identify the applicable requirements for the actual bag.
Request reports with identifiable samples, tested components, methods, dates and results. Check whether the sheet grade, colour, print, liner and trim in the order match the evidence. For claims such as “phthalate-free,” define the substances covered and the reporting or detection limits before approving wording. A report for a different material should not silently become approval for this order.
Send a PVC-specific RFQ brief
- Reference style, intended contents, users, destination market and use conditions.
- Sheet reference, appearance or effect, single-layer thickness, tolerance and agreed measurement method.
- Bag dimensions, gusset, handle geometry, joins, liner, closure and artwork placement.
- Physical approval references, appearance zones, performance checks and chemical evidence required.
- Fold and protection, packed-sample review, quantity by variant and the changes that require a new approval.
Send these details through the RFQ form and ask for unresolved points to be listed in the quotation. Use the sample approval guide to record decisions. Once the PVC material and construction are agreed, the shipment inspection guide can help structure the later batch review.