PE vs FR vs A2: Which ACP Core Do You Actually Need?
The Decision That Sits Behind the Whole Façade
Before colour, before finish, before price, there is one decision that governs whether an ACP façade is safe and correctly specified: which core. Get it wrong on the low side and you have a fire risk on an occupied building. Get it wrong on the high side and you have paid for non-combustibility a single-storey shopfront never needed. This article is the practical guide to matching the core to the building.
Alucobond Ghana has specified aluminium-composite façades across Ghana since 1977, and we specify the core to the building — to its height, use, and occupancy — not to the lowest price on the table.
The Three Cores, in Plain Terms
PE (Polyethylene) — Combustible
A 100% polyethylene core. It is the cheapest, and it is the core type involved in the Grenfell Tower fire. It fails the A2 classification under EN 13501-1. It is not appropriate for tall or occupied buildings, and the danger is that it is often supplied without disclosure under the generic label “ACP.”
FR (Fire-Retardant)
Around 70% mineral filler in the core. It burns far less than PE and typically achieves a B-s1,d0 reaction-to-fire class. It is specified where a B-class is permitted for the building — often mid-rise commercial work.
A2 (Mineral-Filled) — Limited Combustibility
Over 90% mineral filler. Classified A2-s1,d0 under EN 13501-1 — the highest fire rating an ACP achieves. This is the specification for high-rise buildings, hospitals, schools, and institutional projects, where limited combustibility is required.
A Quick Comparison
| Core | Composition | EN 13501-1 (typical) | Specify for |
|---|---|---|---|
| PE | 100% polyethylene | Fails A2 | Not for tall/occupied façades |
| FR | ~70% mineral filler | B-s1,d0 (typ.) | Mid-rise where B-class permitted |
| A2 | >90% mineral filler | A2-s1,d0 | High-rise, hospitals, institutional |
Classifications are typical; the actual class is per the specific panel’s certification, which we provide in writing.
How to Match the Core to Your Building
Start With Height, Use and Occupancy
The honest first question is not “what do I want?” but “what does this building require?” A high-rise residential or hospital building is a different conversation from a single-storey retail unit. Height and the number of people who sleep or gather inside drive the requirement upward.
Don’t Forget the System Around the Panel
A non-combustible A2 panel on a badly detailed cavity is not a fire-safe façade. The cavity, fire barriers/cavity stops, sub-frame, and fixings have to be engineered as a system. The core is necessary, not sufficient — which is why we engineer the whole assembly, not just the panel.
Document What You Specify
Whatever core you choose, the EN 13501-1 class and the panel data sheet should be written into the specification and handed over at completion — so what is installed is provably what was approved, not a cheaper substitute.
The Real Standards Behind These Classes
- EN 13501-1 — the Euroclass reaction-to-fire classification (A1, A2, B…, with s = smoke and d = droplet sub-classes).
- BS 8414 + BR 135 — full-scale façade fire test against pass/fail criteria; the post-Grenfell benchmark for whole systems.
- ASTM E84 — the US surface-burning test for flame-spread and smoke indices.
There is no ISO core-rating to quote here, and we never cite a standard a panel has not actually been tested against.
A Note on Cost
A fire-rated core costs more than PE because of the mineral filler — there is no published Ghana FR/A2 premium, so the difference is confirmed on survey. Where the building requires it, that difference is worth it. The full picture is on our ACP Cladding Cost Guide, and the core breakdown lives on Fire-Rated ACP Cladding.
Talk to Alucobond Ghana
If you are not sure which core your building needs, we will tell you honestly — and specify it to the building, not to the cheapest line. Call +233 27 000 0844. Alucobond Ghana, since 1977.