Handling
Storage and handling: where most acrylic damage actually happens
Most damaged acrylic was not damaged in service. It was damaged in a warehouse, a van or a site cabin between delivery and installation.
Handling
Most damaged acrylic was not damaged in service. It was damaged in a warehouse, a van or a site cabin between delivery and installation.
We ship a part that measures and looks correct, and three weeks later we are asked to replace it because of a scratch or a chipped corner. The part did not fail; it was stored or handled in a way that acrylic does not tolerate. These rules cost nothing and prevent most of it.
Protective film adhesive softens in heat and hardens in cold. If a filmed part is stored in a cold workshop, bringing it into a warm building and peeling immediately will tear the film and leave adhesive behind. Let the part reach room temperature first, then peel slowly at a shallow angle.
The opposite problem is worse: film left on a part stored in the sun or in a hot space. The adhesive migrates into the acrylic surface and can only be polished out, which means the part is no longer flat where it was polished. Film left on for more than a few weeks outdoors is a common cause of a "defective" panel.
Acrylic does not absorb much water, so humidity is rarely a problem for the material itself. It is a problem for what is stored with it: cardboard packing that softens and transfers print, and condensation on a cold panel brought into a warm humid space. Let parts acclimatise inside their packing before unpacking.
A crate, not a carton, for anything over 600 mm. Panels vertical, separated by foam or corrugated interleaves, corners protected on all four, and no movement possible inside the crate. Film on both faces. A panel that can move in transit will arrive with a chipped corner regardless of how well the crate is made.
When you receive a delivery, photograph the crate before opening and the parts before removing the film. It takes two minutes and it resolves any condition dispute from evidence rather than from memory.
A few weeks indoors is fine. Beyond that, and especially in heat or sun, the adhesive starts to migrate. If a part will be stored for months, ask for it to be shipped without film and packed with interleaves instead.
Not recommended. UV, heat and rain will degrade the film, then the surface. If there is no alternative, store it under cover, off the ground, with the film removed and the faces protected by a soft cover that does not trap water.
Unsupported storage in a warm space. Acrylic softens slightly as it warms and takes a permanent set from its own weight if it is only supported at the ends. Store flat and fully supported.
A few sheets with interleaves is fine. A tall stack will scratch the lower sheets under the weight and dust between them, and the bottom sheet takes the load. Keep stacks shallow and clean the interleaves.
Clean cotton or nitrile-coated gloves. Bare hands leave oils that interfere with printing and bonding; dirty work gloves leave grit that scratches. Cotton inspection gloves are the usual choice for a visible face.
Most of the damage we are asked to explain happens after delivery, in the customer's own store. The list below is the one we use in our own plant, written so it can be printed and given to whoever actually moves the goods. None of it is expensive; all of it is easy to skip when space is short.
| Rule | What it prevents | Cost of ignoring it |
|---|---|---|
| Store flat, fully supported, never leaning | Long-term bow that never recovers | Scrap on a part that passed inspection |
| Keep the protective film on until installation | Transit and handling scratches | Hand polishing at site, or rejection |
| Never stack film-to-face without interleave | Film bonding to the sheet in heat | Adhesive residue that solvents will not shift |
| Keep below 40 °C and out of direct sun | Distortion, film cure, uneven expansion | Parts that no longer fit their frames |
| Avoid >70% RH and rapid temperature swings | Condensation between film and sheet | Water marks and haze that cannot be polished out |
| Store vertically only for short periods, on edge, in a rack | Creep under self-weight | A bow that appears weeks after installation |
| Never rest anything on a polished face | Point loads and pressure marks | Face polishing, or replacement |
| Keep solvent and adhesive cartons in a separate area | Vapour attack and stress crazing | Crazing that appears only after a month |
The film rule causes the most argument and the most damage. Protective film is a temporary masking, not a permanent coating: most PE films are rated for around six months indoors, less in heat, and once the adhesive has cured onto the sheet it comes off in patches and leaves a residue that requires a solvent wipe. If a fixture is going into a store and will sit in a stockroom for three months before installation, either install it earlier or ask for a film rated for the period — that is a real option we can quote.
Two habits are worth building in. Label cartons with the date of packing, not the date of arrival, so film age is visible without opening anything. And inspect one carton from each batch on receipt rather than all of them at installation — a problem found on day two is a supplier conversation; the same problem found on installation day is a schedule problem for whoever is on site.
Tell us how long the parts will be stored and where, and we will pack for that — film, interleaves, crate and labelling.