Last updated: October 2026
Quick answer: An offset plate is a thin, flat aluminium plate (typically 0.15 to 0.30 mm) where image and non-image areas are separated chemically by ink and water. A flexo plate is a thick photopolymer relief plate (1.14 to 6.35 mm) that prints with fluid ink from an anilox roll. Offset suits paper and board in commercial and carton work; flexo suits film, labels, bags and corrugated.
Key takeaways
- Offset plates are planographic aluminium plates; flexo plates are raised photopolymer relief plates.
- Offset dominates commercial print, books and much folding carton; flexo dominates flexible packaging, labels and corrugated.
- Offset plates are cheaper per square metre and normally used for one job; flexo plates cost more but are often stored and reused for repeat orders.
- The press you own decides the plate, not the other way round.
- We manufacture both offset CTP plates and flexo plates, so one supplier can cover both plate rooms.
Purchasing managers in mixed print plants hear the same complaints from two sides: “offset plates are cheap but our packaging jobs need film” and “flexo plates cost a lot per job”. Both statements are true, and both miss the point. Flexo and offset are different printing processes, and each plate is designed for its own press, ink and substrate. This article compares flexo vs offset printing plates in practical terms so you can choose the right plate for each job and plan your purchasing. For a wider overview of every plate family, see our plate selection guide.
Flexo vs offset plates at a glance
| Criterion | Offset printing plate | Flexo printing plate |
|---|---|---|
| Plate type | Planographic (flat) | Relief (raised image) |
| Material | Grained, anodised aluminium with a coating | Photopolymer on a polyester base |
| Typical thickness | 0.15, 0.20, 0.25 or 0.30 mm | 1.14, 1.70, 2.28, 2.84, 3.94 or 6.35 mm |
| Imaging | CTP platesetter (thermal 830 nm), UV CTcP or PS film exposure | Negative film (analog) or flexo imager (digital LAMS) |
| Ink transfer | Plate to rubber blanket to paper, with fountain solution | Anilox roll to plate to substrate, directly |
| Ink type | Paste ink (conventional or UV) | Fluid ink (water-based, solvent-based or UV) |
| Main substrates | Paper, coated board, some plastics with UV | Film, foil, labels, paper bags, corrugated board |
| Reuse | Normally one job | Often cleaned, stored and reused for repeat orders |
How an offset plate prints
Offset lithography is a planographic process: the image and non-image areas sit on the same level. The aluminium surface is grained and anodised so it holds water. The coating left after imaging and developing forms the image areas, which accept ink and reject water. On press, dampening rollers wet the plate with fountain solution, then the inking rollers apply paste ink only to the image. The image transfers to a rubber blanket and from there to the paper.
Offset plates are imaged on a CTP platesetter. Thermal plates image at 830 nm; CTcP plates use UV exposure. Our offset CTP plates cover thermal, processless, CTcP, violet and PS plates in all standard gauges, and our article on types of CTP plates explains the differences between them.
How a flexo plate prints
Flexography is a relief process. The image stands above the plate floor, and only the raised surface touches the substrate. Fluid ink is metered by an engraved anilox roll onto the relief, and the plate prints directly onto the material. Because the photopolymer is soft and resilient, it prints well on uneven or non-absorbent surfaces such as plastic film, foil and fluted board.
The plate is mounted on a cylinder or sleeve with mounting tape, and the plate gauge must fit the press undercut. Our flexo plate thickness guide explains how to pick the gauge. Flexo plates are imaged either through film or with a laser-ablated mask; see analog vs digital flexo plates.
When to choose offset plates
- Commercial print: brochures, catalogues, magazines and books on sheet-fed or web offset presses. See offset plates for commercial printing.
- Folding carton on paperboard, especially high-graphic cartons printed sheet-fed.
- Newspapers, where fast plate making and low plate cost matter.
- Short to medium runs on paper, where low plate cost keeps the job economical.
When to choose flexo plates
- Flexible packaging: film, foil and laminates printed on wide-web presses. See flexo plates for flexible packaging.
- Self-adhesive labels on narrow-web presses.
- Corrugated boxes, preprint and postprint, where a soft plate is needed on fluted board.
- Paper bags, sacks, tissue and cups, and long repeat orders where plates are stored between runs.
Our flexo printing plates include analog, digital LAMS, solvent, water-wash, thermal-processing and corrugated grades.
Can you run both processes?
Many packaging printers do. A typical mixed plant prints cartons offset and film or labels flexo. The plate rooms stay separate: offset needs a CTP platesetter, processor and developer; flexo needs an exposure unit or flexo imager plus washout and drying. Switching a job from one process to the other is not just a plate change. It means a different press, ink and prepress curve, so it only makes sense when the substrate or run pattern changes.
What you can combine is purchasing. Because we manufacture both offset plates and flexo plates, you can buy both from one supplier and align test protocols, packaging and shipments. Offset CTP platesetters and flexo imagers are supplied with our partner factories if you need equipment too; see our CTP machines.
Cost and workflow factors
We do not publish prices here; they depend on grade, gauge, size and volume and are confirmed in the quotation. These are the factors that decide cost per job:
| Factor | Offset | Flexo |
|---|---|---|
| Plate cost per square metre | Lower | Higher (thick photopolymer) |
| Plates per job | One per colour, normally not reused | One per colour, often reused for repeats |
| Plate making time | Minutes on CTP plus processing | Longer: exposure, washout, drying, finishing |
| Make-ready | Plate mount and ink/water balance | Plate mounting on tape, impression setting |
| Consumables | Developer, gum, fountain solution | Washout medium, mounting tape, anilox care |
Two beliefs are worth correcting. First, “offset always prints better than flexo.” Each process fits different substrates and run patterns; modern flexo plates print high-quality packaging on film, labels and board. Second, “offset is always cheaper.” The cheapest plate does not mean the cheapest job. Compare total cost per job: plate area, reuse for repeat orders, make-ready and the press you already own. Because a flexo plate can be stored and reused for repeat orders, its cost is spread over several jobs, while offset plates are usually remade for each run. To estimate offset plate cost per job, try our plate cost calculator.
Some printers object that switching process means new equipment. It does. That is why the right plate for each job is usually the plate for the press you already have, and the choice between processes is made at the investment stage, not job by job.
FAQ
What is the difference between flexo and offset printing plates?
Offset plates are thin, flat aluminium plates that separate image and non-image areas with ink and water. Flexo plates are thick photopolymer relief plates where only the raised image touches the substrate and prints with fluid ink from an anilox roll.
Which is cheaper, flexo or offset printing?
Offset plates are cheaper per plate, so offset is usually cheaper for paper jobs and short runs. Flexo plates cost more but can be reused for repeat orders and print on film, labels and corrugated board, so for packaging flexo is often cheaper per job. Prices are confirmed in the quotation.
Is offset or flexo better for packaging?
It depends on the substrate. Folding cartons on paperboard are often printed offset. Flexible film, labels, paper bags and corrugated boxes are mostly printed flexo, because the soft relief plate and fluid ink suit those materials.
Can flexo plates be reused?
Yes. After the run, flexo plates are cleaned, dried and stored flat or on sleeves away from light and ozone, then remounted for repeat orders. Offset plates are normally used for one job only.
Why is offset printing used for commercial printing?
Offset gives fine screens on paper, fast plate making with CTP and low plate cost per job, which suits brochures, books, magazines and catalogues with frequent job changes.
Buying plates for both offset and flexo? Request a quote with plate type, gauge, size, press model, ink system and monthly volume for each plate room. Or request trial plates / contact us.
Disclaimer: values on this page are typical and for reference only; final specifications, MOQ, price and lead time are subject to the grade TDS and the quotation.
