Colored PETG sheet is a light-diffusion decision as much as a shade decision. The retail buyer had a Pantone number and a deadline: 240 display faces in a warm off-white, backlit, for a rollout across 40 stores. She had already been told by two suppliers that PETG only came in clear. That is not true, and the correction cost her a week.
Colored PETG sheet is a standard product in opal, black and the primary colours, and custom shades are possible from a modest run. The trick is understanding that colour is a light-diffusion decision as much as a shade decision.
Colored PETG sheet: finish and transmission
- Opal 2 mm to 3 mm: backlit faces, 30 to 45 percent transmission
- Black 2 mm to 4 mm: opaque panels, signage backs, machine covers
- Solid colours 3 mm: POS displays and fascia panels
- Custom shade: matched to a chip, minimum run applies
Opal is the one that catches people out. A bright white opal looks right under office light and then reads grey when backlit, because the pigment density that gives a clean face also blocks light. If the application is a light box, test the sheet against the actual LED spacing before approving the shade.
Black is the opposite problem. A 2 mm black PETG is opaque enough for most fascia work, but under strong sun it heats faster than a light colour and will move more. Fixing detail has to allow for that, especially on a 1.5 m panel.
Batch matching and the rollout problem
A rollout in phases is a colour management exercise. Pigment dispersion varies between runs and base resin lots shift slightly, so a panel from phase one and a panel from phase two can read as different shades in the same store. Reserve colour from the first batch, keep a chip at each store, and specify that later production is matched to the chip under a daylight lamp, not under a phone torch.
One practical limit: PETG is harder to colour-match than acrylic because the extrusion temperatures are lower and the pigment must be chosen for that window. A shade that matches perfectly in acrylic may need a small adjustment in PETG. Approve a chip from actual PETG, not from a painted sample.
For the thermoforming step that usually follows, our PETG thermoforming guide covers the heat cycle and the draw ratio limits that colour affects, and the 3 mm PETG price guide explains how colour and volume change the per-sheet cost.
If the finished piece is a display, the joint and edge detail matter as much as the shade, and the PETG point-of-sale display guide sets out the fabrication approach we use.
Send your Pantone or RAL target and annual volume to oversales@rpplexiglass.com for a colour-matched PETG quote.
Frequently Asked Questions
Is colored PETG sheet available in custom shades?
Yes, from a minimum run. Standard opal, black, red, blue and green are stocked; custom shades need a pigment match and a production batch, usually with a colour chip approval before the run starts.
Does color affect PETG forming?
Opaque and heavily pigmented sheet heats more evenly but draws less than clear because the pigment changes the melt behaviour. Deep draws in black sheet may need a slightly longer heating cycle and a hotter mould.
Why do two batches of the same color look different?
Pigment dispersion and base resin lot. On a retail rollout, reserve colour from the first production run and match later batches against a retained chip, not against a photograph or a memory of the shade.