Custom Peptide Vial Labels

Sizing a label to the vial

The usable label area is not the vial height. It is the height of the straight-sided section of the body, minus a small margin at the shoulder and the base — because a label that runs onto a curve will lift at the edges.

The width is the circumference, less an allowance if you want a gap, or plus an overlap if you want a wrap-around. Wrap-around labels look cleaner and resist edge lifting; gap labels let you see the contents through the glass.

• Labels for 2ml vials — Typically around 45–50 mm wide and 18–22 mm high on the straight body section.
• Labels for 3ml vials — Typically around 48–52 mm wide and 25–30 mm high.
• Labels for 5ml vials — Typically around 65–70 mm wide and 25–30 mm high.
• Labels for 10ml vials — Typically around 74–80 mm wide and 30–35 mm high.
• Always confirm on the vial — Shoulder radius varies between suppliers, so these are starting points, not specifications.

Sending a vial is far more reliable than sending dimensions, and the method for measuring one properly is described in our guide to measuring a vial for custom packaging.

Materials

The facestock — the printed material itself — determines how the label behaves in moisture, oil and handling.

• BOPP (polypropylene) film — The usual choice for vials. Fully waterproof, tear-resistant, and unaffected by condensation. Available in white, clear and matte.
• Polyester (PET) film — More rigid and more chemically resistant than BOPP. Chosen where solvents, alcohol wipes or oils will contact the label.
• Vinyl — Highly conformable, so it handles tight vial curvature well. Softer surface, less scratch-resistant.
• Coated paper — Lower cost and good print quality, but it will wrinkle and delaminate in damp conditions. Only appropriate for dry, short-life applications.
• Synthetic paper — A paper-look material that is genuinely water-resistant — useful when a matte, uncoated appearance is wanted without the fragility of paper.

Moisture, oil and abrasion resistance

These are three separate requirements and they are met in different ways.

• Moisture — Solved by the facestock. A film label is waterproof; a paper label is not, whatever is printed on it.
• Oil and solvent — Solved by the facestock and the overlaminate. PET with a laminate resists alcohol wipes far better than uncoated BOPP.
• Abrasion — Solved by an overlaminate or a UV varnish. Print alone rubs off under repeated handling.
• Overlaminate — A clear film applied over the printed label. The most reliable protection, and it adds a small amount of thickness.
• UV varnish — A cured coating. Thinner than a laminate and cheaper, with slightly less protection.

Adhesive selection

Adhesive is the choice most often made by default and most often responsible for labels failing.

• Permanent adhesive — The standard. Bonds strongly to glass and is not intended to be removed cleanly.
• Removable adhesive — Peels away without residue. Used for temporary identification, inventory marking or trial labelling.
• Cold-temperature adhesive — Formulated to bond at low temperatures. Standard permanent adhesives can fail if applied to an already-cold vial.
• Freezer-grade adhesive — For labels that must remain attached at sustained sub-zero temperatures.
• Tamper-evident adhesive — A facestock and adhesive combination that fragments or leaves a void pattern if the label is lifted.

The single most important question is the temperature of the vial at the moment the label is applied — not the storage temperature afterwards. Tell us both, and we will specify accordingly.

Roll and sheet formats

• Roll labels — Wound on a core for applicator machines or hand dispensers. Required for any automated application, and more economical at volume.
• Sheet labels — Laid out on flat sheets for hand application. Practical for short runs, small batches and laboratory use.
• Core size and winding direction — Specified to match your applicator; getting this wrong stops a line.
• Labels per roll — Set against your run length and how often you want to change rolls.
• Gap and pitch — The spacing between labels, which the applicator sensor uses to index.

Variable data printing

Variable data means each label in a run can carry different content while sharing one design — the mechanism behind batch coding, sequential numbering and per-unit identifiers.

• Batch and lot numbers — Printed per batch, or per label where each unit is individually tracked.
• Expiry and manufacture dates — Printed as part of the label rather than overprinted later.
• Sequential numbering — For course packs where each vial has a position, or for unit-level traceability.
• Serialised codes — Unique codes per label, supplied by you as a data file.
• Product name variation — One design across a set, with the product name changing per position.

Where each vial in a multi-vial course needs its own number, variable data on the label is far more practical than printing positions on the box — this is one of the main reasons 4-vial kit boxes work well with sequenced labels.

Batch, lot and expiry areas

• Printed blank fields — Boxed areas left empty for handwriting or overprinting at your facility.
• Thermal transfer zone — An area of facestock left free of laminate so an inline printer can mark it.
• Pre-printed variable data — Values printed during label production, requiring no equipment at your end.
• Field sizing — Large enough to write in legibly — a common oversight on small labels.

Barcodes and QR codes

A small vial label is exactly where barcodes fail, so this deserves specific attention.

• Minimum magnification — Every symbology has one. Reducing below it causes scan failures that only appear later, at point of use.
• Quiet zone — The clear margin either side of the code. Crowding it with other content is a common cause of failure.
• Curvature — A linear barcode wrapped around a small-diameter vial distorts. Orienting the bars parallel to the vial axis helps considerably.
• QR and 2D codes — Tolerate curvature better than linear barcodes and fit a small square area more efficiently.
• Contrast — Dark bars on a light ground. Coloured or reversed codes scan unreliably.

We will flag a code that looks likely to fail at proofing. Verifying that the code is correct, registered to you and appropriate for your market is your responsibility.

Legibility and print quality on a small label

• Solid dark text on a light ground survives reduction better than light text reversed out of dark.
• Avoid fine hairline rules and very light typeface weights, which can break up at small sizes.
• Matte laminates reduce glare and are easier to read under strong lighting than gloss.
• Leave more space around critical text than the layout appears to need — labels are read quickly, not studied.
• Check the printed proof at arm's length, not at 400% on a screen.

Tamper-evident options

• Destructible vinyl — Fragments into small pieces if removal is attempted.
• Void-pattern facestock — Leaves a visible pattern on the glass and on the label when lifted.
• Perforated seal labels — Applied across a closure so opening tears the label.
• Security overlaminate — A laminate that cannot be removed without visible damage.

Whether tamper evidence is needed for your product, and what form satisfies that need, is a determination for you and your regulatory advisers.

Artwork setup for vial labels

• Work on the label die line we supply, at 100% scale.
• Keep all critical content at least 2 mm inside the label edge, more on a wrap-around.
• Extend background colour 2 mm beyond the die line on every edge.
• Supply barcodes as vector artwork, not as placed images.
• Outline all fonts and supply as print-ready PDF, with any spot colours named explicitly.
• If a thermal transfer zone is needed, mark it clearly as a separate layer.

The complete file specification, including how we handle spot colours and separations, is on the artwork guidelines page.

Regulatory responsibility

This needs stating plainly, because labels are where the misunderstanding is most costly.

• Labels supplied by Peptides Boxes do not make any product compliant with any regulation.
• We do not review label content for mandatory statements, warnings, symbols or identifiers.
• We do not verify barcode registration, product identifiers or claims.
• Reviewing and approving the final label content, and its suitability for your market, is your responsibility.
• We check files for production issues only — resolution, bleed, colour, code sizing risk.

Ordering labels

• 1. Send a vial — Label sizing comes from the straight body section, which has to be measured on the real thing.
• 2. State the conditions — Application temperature, storage temperature, and anything the label will contact.
• 3. Format — Roll or sheet, and if roll, the core size and winding direction your applicator needs.
• 4. Proof and printed sample — A printed sample applied to a real vial, checked at reading distance.
• 5. Production — Printed, laminated, die-cut, and supplied on rolls or sheets.

Quality control

• Sample labels are applied to a real vial and checked for edge lift at the shoulder.
• Adhesion is checked at the stated application temperature, not at room temperature only.
• Barcode print quality and contrast are inspected.
• Variable data is verified against the supplied data file at intervals through the run.
• Die-cut registration to print is monitored, since a shifted cut is immediately visible on a small label.

Delivery

• Roll labels are supplied on the specified core, wound in the specified direction, in counted rolls.
• Sheet labels are supplied flat in counted packs.
• Labels are packed to avoid edge damage, which causes application faults.
• Nationwide delivery across the United States.