Match the wall to the formula. Single-layer PE passes oxygen at about 150–300 units and is right for hand cream, body lotion and cleansers. Five-layer co-extruded EVOH (PE / tie / EVOH 15–20 µm / tie / PE) passes 0.2–1.2 — about two orders of magnitude lower — and is the default for retinol, vitamin C, peptides and essential-oil formulas, with a seamless look. ABL (aluminium foil core, 12 µm or 9 µm) gives the strongest barrier for solvent-heavy bulks and fluoride, with a visible side seam. PBL is the foil-free laminate for mid-range skincare. AHA/BHA acids are a contact question — PP/PE contact path, no metal, EVOH if the active is oxygen-sensitive. None of it changes the MOQ; all of it is confirmed with the actual bulk at 48°C for 30 days.
Four structures, one number that matters
The barrier of a tube is described by how much oxygen crosses the wall in a set time, and the gap between structures is not incremental. A single-layer polyethylene sleeve is a good squeeze tube and a poor barrier: 150–300 units of oxygen transmission. Put a 15–20 µm layer of EVOH (ethylene vinyl alcohol) in the middle of a five-layer co-extrusion and the figure falls to 0.2–1.2 — around a hundredth. Replace the polymer barrier with aluminium foil and the barrier is set by the foil's pinhole count rather than by permeation at all. In ethanol weight-loss tests the co-extruded EVOH tube loses tens of times less than single-layer PE, which is the same physics from the inside out: what keeps oxygen out keeps aroma and alcohol in.
| Structure | Typical layers | Barrier | Look and handling | Where it is used |
|---|---|---|---|---|
| Single-layer PE (co-extruded) | PE | Low: OTR 150–300 units | Seamless; best print surface; softest squeeze | Hand cream, body lotion, cleansers, plain conditioner — appearance matters, barrier does not |
| Five-layer co-extruded EVOH | PE / tie / EVOH 15–20 µm / tie / PE | High: OTR 0.2–1.2 units; ethanol loss tens of times lower than mono PE | Seamless; premium; squeezes like PE | Vitamin C, retinol, whitening and peptide formulas; essential-oil and fragrance-led products |
| ABL — aluminium barrier laminate | PE / PE+EAA / AL / PE+EAA / PE | Highest; set by foil pinhole count; foil now 12 µm or 9 µm, down from 40 µm | Visible side seam; holds a crease (dead-fold); not metal-detectable | Toothpaste-style tubes, pharma creams, strongly fragranced or solvent-bearing products; fluoride |
| PBL — plastic barrier laminate | PE / PE / EVOH / PE / PE (or PVDC, oxide-coated PET) | High; foil-free | Visible side seam; springs back after squeeze; metal-detectable | Mid-range skincare and hair care; non-barrier PBL for fast-moving low-cost products |
Selection rule in one sentence: if the formula is oxygen-sensitive (vitamin C, retinoids, whitening agents), or its value is in a volatile aroma (essential oils, ester-rich fragrance), or it is mildly corrosive, specify five-layer co-extrusion or a laminate; if it is a fast-moving hand cream, a single-layer tube with a good print is the honest choice.
Formula by formula
| Formula | Structure | Why, and what else to specify |
|---|---|---|
| Retinol, vitamin C, peptides, whitening actives | 5-layer PE / tie / EVOH 15–20 µm / tie / PE; ABL for the most sensitive | Oxidation browns the bulk and kills potency; OTR 0.2–1.2 vs 150–300. Opaque or dark tube and carton; nitrogen flush on the filling line where possible. Airless bottle is the alternative when zero air contact is the brief |
| AHA / BHA acids, pH below 4 | Contact path in PP/PE only; EVOH co-ex if the acid is paired with an oxygen-sensitive active | Acid etches coatings and plating, so no metal or plated part in the bulk path — a plated cap is exterior only, with a PP inner plug. Barrier itself is a secondary concern unless the formula is also oxygen-sensitive |
| Essential oils, ester-rich fragrance, aromatherapy blends | 5-layer EVOH co-ex; ABL where solvent load is high | Aroma loss through mono PE is the product failing on shelf; essential oils also attack AS, craze PMMA and swell standard NBR gaskets — test the cap plug and any applicator with the oil |
| Sunscreen and easily oxidised emulsions | ABL or 5-layer EVOH; PP/PE contact only | Oil-rich SPF bulks attack AS and craze PMMA — keep acrylic off the contact path; the 48°C / 30-day test with the filter system governs the whole programme |
| Ethanol above about 30% | EVOH co-ex with an alcohol-rated cap gasket | Standard gaskets and PET components soften; specify ethanol resistance and test the plug |
| Fluoride toothpaste | ABL — mandatory | Fluoride ions permeate and corrode plastic barrier layers |
| Hand cream, body lotion, cleanser, conditioner | Single-layer PE (or PCR-PE) | Barrier does not matter; print does. Put the budget into the artwork and cap |
Two things the table assumes. First, the contact layer is polyethylene in every structure, so "PE tube" versus "EVOH tube" is a barrier decision, not a compatibility one; the EVOH never touches the bulk. Second, barrier and light are separate problems: oxygen-sensitive actives also need an opaque or dark tube and a carton. The eight hard material rules behind the table — ethanol above 30%, pH below 4, acetone, essential oils, fluoride, PMMA — are on the formula × packaging compatibility matrix.
ABL versus PBL versus co-extrusion: the practical differences
- Seam. Laminate tubes (ABL and PBL) are made from a flat web wrapped and welded, so they carry a visible side seam; co-extruded tubes are seamless. For a premium skincare tube the seam is usually the deciding cosmetic point in favour of five-layer co-extrusion.
- Squeeze behaviour. ABL holds a crease and stays squeezed (dead-fold), which consumers read as toothpaste; PBL and co-ex spring back. Dead-fold has a use: it shows how much is left and keeps air from being sucked back in.
- Metal detection and recycling. PBL is foil-free, so it passes a metal detector on the filling line and sits better with plastic-recycling claims; ABL does neither. A PCR-PE mono-material tube is the structure to specify when recyclability is the brief — with the barrier of single-layer PE.
What barrier does to MOQ, price and lead time
Almost nothing to the minimum. A five-layer EVOH tube and a mono PE tube run on the same industry floor of 5,000–10,000 per SKU (3,000 sometimes negotiable), the same RMB 200–300 (≈USD 28–45) printing plates and the same 15–20 days from sample-tube approval, with the same ±10% delivery tolerance. The barrier changes the unit price of the sleeve — EVOH resin and a five-layer die cost more than PE through a single die — and it changes nothing about the artwork, which is fixed by diameter. The floors are in tube MOQ and plate cost; the layflat print area per diameter in print area by diameter.
How the choice is confirmed
Structure is a hypothesis until the actual bulk has sat in the actual tube. The compatibility protocol is the same for every structure: filled tubes at 48°C and 75% relative humidity for 30 days with ambient and cold controls, passing on no colour, odour, swelling or surface change, plus a colour-migration check of the decorated tube in 75% ethanol at 48°C for 12 hours. Alongside it the tube's own thresholds apply — end seal ≥20 N/cm, 0.15 MPa burst for 3 s, 10 kg for 5 min filled, cycling at 48°C and −15°C — plus an inner plug and an ethanol-rated gasket where actives demand it. The full sheet is on cosmetic tube specifications and the gates on the QC standards page.
Vella is a Guangzhou-based beauty packaging solutions provider — a sourcing partner working with vetted partner factories operating to ISO 22716 / GMP — and fixes the structure from the formula brief (actives, pH, ethanol, oil load) before sourcing, then runs the 48°C / 30-day test on the assembled tube. The structures are on cosmetic tubes; actives in tubes, airless and jars are compared on skincare packaging solutions, and SPF formats on sunscreen packaging.
Frequently asked
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