Flexible Cosmetic Packaging: Sachets, Refill Pouches and Wipes

A formula that is compatible with one pack may leak or lose fragrance in another. Choose the contact layer and laminate adhesive for the actual formula, then test the finished sachet, refill or wipe pack.

What goes wrong with cosmetic products

• Chemical attack on the film: oils, essential oils, alcohol, fragrance and surfactants can swell or soften the sealant, cause delamination between layers, or make seals creep over time.
• Loss of volatiles: fragrance and water can migrate out of the pack, and in some cases flavor or odor from the film can migrate in.
• Oxidation: oils, vitamins and natural actives can degrade with oxygen and light.
• Leakage: a tiny pinhole or weak corner in a sachet makes a mess in a bag or a bathroom.
• Appearance: cosmetics are bought on look, so print quality, color and finish count as much as protection.
• Dosing and opening: a sample sachet must tear open cleanly and deliver the right amount.

Chemical compatibility: test with the real formula

Assess oils, alcohol, fragrance and surfactants with the finished laminate, seal and closure. An adhesive manufacturer’s public portfolio distinguishes ethanol-resistant systems and systems intended for cosmetic wet wipes. A packaging manufacturer’s public cosmetic-sachet information describes chemical resistance for its laminates. These are separate properties, not approval for an unspecified cosmetic formula.

Obtain grade-specific contact-layer and lamination-adhesive documentation; a generic PE or PET name cannot settle compatibility. In finished-pack aging trials, record seal strength, delamination, color, odor, weight loss and leakage. Choose storage and accelerated-aging conditions in the product validation plan rather than inventing a universal temperature or duration.

Takeaway: An adhesive’s stated resistance does not establish the compatibility of the whole pouch.

Sample and single-dose sachets

Sachets are small pouches, usually sealed on three or four sides, used for samples, trial sizes and single-use treatments. They need a film that seals cleanly through creamy or oily product, tears easily with a notch or laser score, and prints well. A common construction is a printed outer layer, an aluminum foil or metallized layer for barrier and opacity, and a polyethylene or similar sealant. Thin walls and a small seal area leave little margin, so seal width and sealant choice matter. The format is covered in sachet packaging, and sachet film explains how the film runs on machines.

Refill pouches for liquids

Spouted refill pouches let consumers refill a bottle or dispenser; compare material use on the actual refill and bottle designs. They have to hold liquid without leaking, resist drop and squeeze, and survive shipping. Heavier fills and viscous formulas need strong side seals, a good spout-to-film seal and a film gauge matched to the weight. The spout-to-film joint is a potential leakage location; inspect it after storage and handling. The spouted pouch and stand-up pouch pages cover the format and structure, and mono-material packaging covers recyclability claims and design guidelines.

Wet-wipe packs with resealable labels

Wipes are packed in flow-wrapped packs or in pouches with a resealable label or a lid. The main job is keeping the lotion in: water and alcohol vapor must not escape, and the film must not absorb the lotion. A high moisture barrier film, often metallized or a coextruded film with a good WVTR, is common. The resealable label has to stick repeatedly to the film, even after contact with lotion, so test adhesive compatibility with the lotion. WVTR explains how moisture barrier is measured, and flow wrapping of wipe stacks follows the principles in flow wrap packaging.

Cosmetic packaging structures

Confirm the numbers with supplier data. OTR and WVTR values depend on temperature and humidity, so ask for the test conditions.

The main materials are PET film and aluminum foil.

Premium print and finishes

Cosmetics buyers pay for appearance. Packs often use reverse-printed film with matte or soft-touch coatings, metallic effects, spot gloss, cold foil or embossing. Print is usually done on the outer film and then laminated, so the ink is protected. Some effects, like soft-touch, change the feel of the pack and can slightly affect seal behavior or friction against forming parts, so test finishes on the line. A matte surface also shows scuffs differently. Keep color tolerances realistic: a brand color on a metallized or foil structure will not look the same as on white film. Laminated packaging explains how layers are combined.

Steps to specify a cosmetic pack

Formula changes and wipe reclosing

Repeat the relevant finished-pack checks after a formula change, even if the product looks the same. For wipes, test the label or lid after lotion contact and repeated openings; a closure that sticks initially does not establish moisture retention throughout use.

For the next checks, household refill packaging covers formula and handling risks, spouted pouches covers fitments, and seal strength testing distinguishes force from leak integrity.

Method and sources

Published examples identify documentation to request; they do not establish oil, alcohol or fragrance compatibility for the reader’s formula. Portfolio and laminate statements reviewed 2026-10-08; no formula-aging data are presented.

• Adhesive manufacturer: ethanol resistance and wet-wipe applications
• Packaging manufacturer: cosmetic laminate information