Ask for three records from this lot before the rest is packed. First, the origin of the lift photographed close enough to see it: which edge it starts on, whether that edge was cut at the factory or moulded, and how far the separation reaches along the panel. Second, a cut edge and a factory edge photographed side by side on a panel from this shipment, with the same two edges on the approved sample in the same set. Third, a corner pick test on a panel from this lot, with the lifted corner and the face sheet in the frame, plus the lamination batch and date for the panels in this container. A specification for the face sheet does not explain a lift that started at one edge of one batch.

Where the lift starts tells you what to fix

A face sheet that has come away from the core is a layer separation, and the reference on delamination describes exactly that mode of failure, a material separating into layers. What matters for the fix is where the separation begins. A lift that starts at a cut edge is usually about the exposed bond line and how the panel was handled and stacked after cutting. A lift that starts on a moulded edge points at the forming step itself, where the face is wrapped or pressed into shape. A lift that starts at a corner, with the rest of the edge still bonded, is usually about pressure, and pressure usually comes from packing and straps.

Photograph the origin, not the widest part of the gap. A picture taken where the lift is widest shows the symptom; a picture taken where it begins shows the cause. Ask for the whole panel to be photographed first, so the position on the panel is clear, and then for the close view of the starting point with the same panel visible in the corner of the frame.

The cut edge is the exposed one

Many panels are laminated as a sheet or a long extrusion and then cut to the ordered length, and a cut exposes the bond line to air, to handling and to whatever the panel is stacked against. If the face sheet stops a little short of the cut, or the cut leaves a torn lip of face material, the lift will start there the first time the panel is stacked face to back with another. Ask for a photograph of the cut edge on a panel from this lot and on the sample, taken at the same angle, and for the answer to one question: how far does the face sheet run past the point where the cut is made.

Then look at the design. Many installations hide the cut edge behind a trim, a corner profile or a skirting, and a small lift in that zone never shows. If your project uses such a profile, the panels with a lift on the cut edge can often be used where that edge is covered, and that is a sorting decision rather than a claim. The panels whose lift is on the factory edge, which stays visible, are the ones that cannot be used, and the two groups should be separated before anything is installed.

The packing presses on the face

Ask how the panels are packed and look at the photograph. Panels stacked face to back put the face of one panel against the core edge of the next, and a strap over the outside of the bundle presses the top panel’s face against everything under it. Edge protection, corner boards and a strap pattern that does not run across the face are the details that decide whether a marginal bond survives a sea voyage. A bundle photographed with a strap lying across the face of the top panel is a bundle that will show a lift at the edges before it is even opened.

Ask for the packing photograph of a bundle from this lot before it is closed, from several angles, with the strap pattern and the edge protection visible. If the packing needs changing, the change costs corrugated board rather than panels, and it applies to the rest of the order immediately. That is worth more than a discussion about the adhesive. The bow check covers whether a panel is flat; this check covers whether its face is still attached and what will be pressed against it in transit.

Test the corner the way a fitter will

Ask for one panel from this lot to be picked at a corner with a fingernail or a wooden stick, the way a fitter checks a panel before installing it, and photographed before and after. This is not destructive testing; it is the first thing anyone does to a panel they are suspicious of, and it tells you whether the bond is marginal everywhere or only at one edge. Do the same on the sample and put the two photographs together. A corner that lifts under a fingernail on this lot and does not on the sample is the shortest possible summary of your complaint.

Ask also for a piece from this lot to spend time in the condition a carton sees on a hot day, and to be photographed afterwards. A panel that is fine in a cool warehouse and loses its edge after a day in a hot container is a panel whose bond is temperature sensitive, and that is a finding about the batch rather than about the trip. Keep both pieces, the picked corner and the exposed one, tagged with the panel’s batch number.

The batch and the date on the back

Ask for the lamination batch number and the date the face was bonded, for the panels in this container, and compare it with the sample’s record. A lift that appears across one batch and not the previous one usually points at a change: a different roll of face sheet, a different adhesive, or a cure that was shortened on a busy week. None of that is visible on the finished panel, which is why the batch record is part of the evidence rather than paperwork for its own sake.

Where the panels carry a batch marking, photograph it on a panel from this shipment with the lifted edge in the same frame. That single picture ties the defect to a run, and a run can be isolated. Without it, the factory can only answer in general terms, and a general answer leaves you checking every panel in the future order by hand. The batch number costs nothing to record at the lamination line, and it is the difference between a recall of one run and a permanent suspicion of every panel.

What to do with what already arrived

Sort by where the lift is, not by how bad it looks. Panels with a lift that will be hidden under a profile or against a cut end go into the usable group, with the edge marked so the installer knows which way to turn the panel. Panels with a visible factory-edge lift go into the other group, and stay there. Photograph one panel from each group with its carton number before anything is moved, and keep the worst panel as the record.

If a site repair is offered, put it in writing and keep it narrow. Adhesive worked under a lifted edge and pressed with weight can hold a panel for a while, and it is not a repair for a batch that lifts along a whole edge. A site repair also changes who owns the failure, which is why it is worth deciding deliberately rather than letting an installer solve it quietly. The glued-on-wall failure has its own check in the test bond used for bonded installations, and it is a separate conversation from a face sheet that lifts before the panel is on a wall.

Write the hold the same day

Send one message to the person who controls lamination and packing. Name the order and the panel. Say the sample face was bonded flat and panels from this container lift at the edges, and state the hold in one sentence: no more panels packed until the records exist. Name them. First, the lift photographed where it starts, with the panel in frame so the edge and the position are clear. Second, the cut edge and the factory edge on this lot beside the same two edges on the sample. Third, the corner pick test on this lot and on the sample, with the lamination batch and date for this shipment. Fourth, the bundle photographed before closure, showing the edge protection and the strap pattern.

A release is your note that the edges match the sample, that the pick test does not lift a corner, and that the packing no longer presses on the face. A face sheet specification, a promise to handle the panels more carefully, and a photograph of a good panel chosen from the bench do not release the hold.

Keep the two test pieces, the edge photographs and the packing photograph in the order folder with the carton numbers. A lifted face is easy to photograph and easy to argue about, and the pictures from this lot are what make the next batch checkable in an afternoon rather than a wall.