ABL, PBL or PE: Choosing the Tube Body Material

Three materials, two forming routes

Almost every packaging tube in the world is one of three things: ABL, PBL veya PE. The names sound like a material classification but they are really a classification of construction, and that is why they get confused with each other in specification documents.

ABL — aluminium barrier laminate. A composite sheet built around an aluminium foil core, laminated with plastic films on both faces. Formed into a tube by rolling and seam welding.

PBL — plastic barrier laminate. An all-plastic multi-layer sheet, usually with an EVOH barrier core. Also rolled and seam welded, or in some plants co-extruded directly as a tube.

PE — an extruded tube. Single-layer or co-extruded polyethylene, seamless, made directly from a die. No sheet, no seam.

What is actually in the wall

Table 1 — Wall construction. The ABL foil is thinner than a human hair and is still the best barrier in the table by three orders of magnitude.

The number that surprises people is the foil thickness: 9 µm is common for standard tubes, 12 – 25 µm for higher grades. Nine micrometres of aluminium has no pinholes when it is laminated properly, and a pinhole is the only way a foil barrier fails. This is why foil quality and lamination integrity matter more than foil thickness — going from 9 to 12 µm buys very little unless the 9 µm foil was perforated in the first place.

Barrier, in numbers

Table 2 — Indicative barrier values. HDPE is a good moisture barrier and a very poor oxygen barrier — the two do not track each other.

Read the table carefully, because the usual mistake is in it. HDPE has an oxygen transmission rate roughly twenty thousand times that of an ABL tube, and a water vapour rate that is respectable. If your product is a hand cream that only needs to hold its moisture, plain PE is fine. If it is a cream with an unsaturated oil that goes rancid on oxidation, plain PE is a shelf-life failure waiting to happen.

EVOH is the interesting middle. In dry conditions a 30 µm EVOH layer approaches foil performance. But EVOH loses barrier as it absorbs moisture, and a tube contains water. In a 90 % relative humidity environment the same layer can lose 60 – 80 % of its dry-state performance. That is why PBL structures put EVOH between two PE layers and why the inner PE thickness matters: it is a moisture buffer, not just a food-contact layer.

Feel, look and the things consumers notice

Material choice is as much a sensory decision as an engineering one, and the brand team usually has an opinion before the technical brief exists.

Table 3 — Sensory differences. The crackle of an ABL tube is a recognised quality cue in some categories and a complaint in others.

The dead-fold property of ABL is underrated. A foil tube stays where you press it, so the consumer can roll it up from the tail as it empties. A PE tube springs back, which is why PE tubes in high-viscosity products leave 5 – 8 % of the fill unreachable. For a €30 serum that is a customer complaint; for a €3 hand cream nobody notices.

Cost, at three volumes

Prices vary too much by region and by print to give absolute figures, so this is a relative index against an extruded PE tube at 100,000 pieces.

Table 4 — Relative piece price. The gap closes with volume because print cylinder and tooling amortisation dominate at low volume.

Two structural reasons keep PE cheapest at every volume. The extruded body needs no print cylinders — decoration is screen or offset on the finished tube, using plates rather than engraved cylinders. And the body is a single material, so there is no lamination step, no primer, no foil and no seam welding.

The counter-argument is artwork. If the design needs a photographic image, PE cannot deliver it and the comparison is over before it starts. That is the real reason most premium cosmetics are laminate and most value and industrial tubes are extruded.

Recyclability is now a purchasing criterion

This has changed faster than any other part of the decision in the last five years, and it is now often the first question rather than the last.

Table 5 — End-of-life position. The "effectively yes" cases depend on the barrier and tie layers staying below the threshold that sorting equipment can tolerate.

An ABL tube is a metal-plastic composite and no mainstream recycling stream separates it. That does not make it wrong — a pharma product that fails on barrier is worse than a tube that ends up in energy recovery — but it does mean the material choice now has a compliance dimension. Brands selling into the EU are already asking for the recyclability class before they ask for the price.

A decision sequence that works

1. Is the product oxygen-sensitive? If shelf life depends on keeping oxygen out and the product is aqueous, ABL or high-barrier PBL. If it is an oil-based product where oxidation matters, the same answer applies but the numbers differ.
2. Does the artwork need halftone? If yes, laminate — either ABL or PBL. An extruded tube cannot do it.
3. Is recyclability a stated requirement? If yes, extruded PE or PBL. ABL is out unless the product genuinely needs foil.
4. What is the volume? Under 30,000 pieces, extruded PE unless the barrier or artwork forces otherwise.
5. Does the product need a dead fold or a specific hand feel? ABL for dead fold, PE for springiness, PBL sits between and can be tuned.

Run those five in order and you usually end up with one option and a fallback. The teams that get into trouble start with the material they used last time and then look for reasons to keep it.

Matching the head and cap to the body

One detail that trips up first-time buyers: the head material has to be compatible with the body material, or the weld will not hold. The head is injection moulded, so it is HDPE or PP; the body is PE, EVOH-based PBL or foil laminate with a PE contact layer.

Table 6 — Body and head compatibility. A mismatch here shows up as a leak at the shoulder, not at the weld line, which makes it hard to diagnose.

If the barrier layer reaches the weld zone, the weld fails. This is why laminate tubes leave an unbarriered margin at the cut edge — the foil or EVOH is trimmed back so that only PE meets PE at the joint. On a co-extruded PE body the same applies: keep the barrier layer out of the last half millimetre before the cut, or specify an all-PE sealing layer.