The material answer to “how long do they last” is longer than you care about. Polypropylene is not going to degrade meaningfully in a warehouse over any horizon most operations plan on. The real answer is that panels leave service for three specific reasons, all of which are about how they are treated rather than how old they are.
Crushing
A panel loaded beyond what its thickness can carry, or point-loaded by something with a small footprint, takes a permanent dent. Once the core is crushed the panel has lost its thickness locally and will not recover. This is the most common retirement cause on layer pads and it is a specification error more often than an accident – the panel was too thin for the load.
If you are seeing crushed panels regularly, the fix is a thickness step up, or a corrugated sheet if the load is genuinely light. We covered that comparison in honeycomb versus corrugated sheet for pallet liners.
Delamination
The face separating from the core, usually starting at an edge. It begins as a small lift you can see at the trim and it propagates. A panel with a lifting face will keep lifting – there is no repair worth doing – but it can often be cut down and used smaller, which is worth knowing before you scrap it.
Delamination is accelerated by water getting into an unsealed edge and by flexing. Panels that get bent repeatedly, or stored leaning, delaminate sooner.
Edge damage
Crushed and split edges from being dragged, dropped on a corner, or caught on a pallet. Polypropylene is tough but a focused blow on an edge will split a face. This is mostly forklift and handling discipline, and it is the reason panels that run in a controlled internal loop outlast the same panel in a multi-party pool by a wide margin.
What ultraviolet does
Unstabilised polypropylene chalks and embrittles in sun. If your panels spend time in a yard, this is the thing that will actually age the material – and it is the one case where a real lifetime limit exists. UV-stabilised grades last several times longer outdoors and cost a little more. If panels are stored outside, specify it; if they are not, do not pay for it.
What a realistic loop life looks like
We avoid quoting a number of trips because the spread is enormous and the honest answer depends on the loop. In a closed internal loop with reasonable handling, panels routinely outlast the pallets they sit on. In an open pool with several handlers, the same panel might not see a year. The variable is not the panel.
What we would suggest instead is to track it: mark a batch with the date it went in and count what comes back damaged at six months. That gives you your own number, which is worth more than anybody’s estimate – including ours.
What we can do
We supply PP honeycomb panels and will specify thickness from your load and loop. Tell us the application, whether panels sit outside, and whether the loop is closed or open, and we will tell you what to expect – including when a cheaper panel is the right call because the loop is going to lose them anyway.