Printing Plate Selection Guide: Choosing the Right Offset or Flexo Plate
Last updated: October 2026
Quick answer: Choose a printing plate in this order: press type (offset or flexo), imaging workflow (film, thermal CTP, UV/CTcP, violet or flexo imager), run needs (length, UV inks, baking) and chemistry tolerance (full processing, low-chem or processless). The workflow decides the plate family; run needs and chemistry choose the grade.
Key takeaways
- The imaging workflow decides the plate family first: a thermal platesetter needs thermal plates, a UV platesetter needs CTcP plates, a film frame needs PS plates.
- Run needs and chemistry tolerance then choose the grade — single- or double-layer, bakeable, processless.
- For flexo, film vs flexo imager decides analog vs digital; the washout route decides solvent, water-wash or thermal plates.
- Confirm any change with trial plates on your own press, inks and paper or substrate.
With so many plate types to compare — thermal, processless, CTcP, PS, violet, polyester, analog and digital flexo, water-wash and thermal flexo — it is easy to buy a plate that does not match your platesetter, or one that scums with UV inks. This printing plate selection guide is the decision tool we use with printers, prepress bureaus and dealers. We manufacture all of the plate types below in our own factory, so one supplier can cover both offset and flexo plates; the recommendation is driven by your equipment and jobs, not by what we want to sell. Two plate types we do not supply are noted where relevant.
Start with four questions
- Press type: sheetfed or web offset, small-format offset/duplicator, or flexo (labels, flexible packaging, corrugated)?
- Imaging workflow: film and contact frame, thermal CTP (830 nm), UV/CTcP platesetter, violet platesetter, or for flexo a film workflow vs a flexo imager?
- Run needs: typical run lengths, UV or LED-UV inks, abrasive papers or boards, need for baking?
- Chemistry tolerance: are you happy running a processor with developer, do you want low-chem, or do you want no plate chemistry at all? For flexo: solvent, water or thermal processing?
Answer them in order. The first two decide the plate family and are rarely negotiable without new equipment; the last two choose between grades within that family.
Offset plate selection table
| Imaging workflow | Run needs | Chemistry tolerance | Recommended plate |
|---|---|---|---|
| Thermal CTP (830 nm) | General commercial work, conventional inks | Processor with developer | Single-layer thermal CTP plates |
| Thermal CTP (830 nm) | UV/LED-UV inks, aggressive chemicals, long runs with baking | Processor with developer, baking oven | Double-layer thermal plate (thermal range) |
| Thermal CTP (830 nm) | Short to medium runs, conventional inks, fast turnaround | No processing chemistry wanted | Processless thermal plates |
| UV / CTcP platesetter | General commercial and newspaper-type work | Processor with developer | Single-layer CTcP plates (double-layer CTcP is not supplied) |
| Film + UV contact frame | Existing film workflow, conventional inks | Processor with developer | Positive PS plates (negative PS is not supplied) |
| Violet platesetter | Commercial and newspaper work on violet systems | Processor as specified in the TDS | Violet photopolymer plates |
| Small-format offset / duplicator | Short runs, quick jobs | Low or no chemistry, depending on grade | Polyester offset plates |
Offset plate gauges are typically 0.15 mm, 0.20 mm, 0.25 mm and 0.30 mm, set by your press clamp and size — the plate size chart lists common sizes per press. If you are new to the families, our article on types of CTP plates explains how each coating works.
Flexo plate selection table
| Imaging workflow | Run and print needs | Processing route | Recommended plate |
|---|---|---|---|
| Negative film + exposure unit | Line work, text, solids; cost-sensitive jobs | Solvent washout | Analog flexo plates |
| Flexo imager (LAMS) | Fine halftones, process colour, labels, flexible packaging | Solvent washout | Digital LAMS flexo plates |
| Film or flexo imager | Labels and packaging where solvent is unwelcome | Water washout | Water-wash flexo plates |
| Flexo imager (LAMS) | Fast plate turnaround, no solvent or drying | Thermal processing | Thermal flexo plates |
| Film or flexo imager | Corrugated board, rough or uneven substrates | Per grade | Corrugated flexo plates |
Standard flexo gauges are 1.14 mm, 1.70 mm, 2.28 mm, 2.84 mm, 3.94 mm and 6.35 mm. Thin gauges suit labels and flexible packaging; 3.94 mm and 6.35 mm suit corrugated post-print. See the flexo plate thickness guide for details.
Choosing by press and workflow
The cheapest plate type will do for any press — that is the belief that causes most mismatches. In reality the imaging workflow decides the plate family first. A thermal platesetter images at 830 nm and needs thermal-sensitive plates; a UV platesetter needs CTcP plates; a film frame needs PS plates; a violet platesetter needs violet plates. A plate that does not match your platesetter will not image correctly, whatever its price. If you are not sure what your platesetter supports, our CTP compatibility guide walks through it.
For flexo, the split is film vs flexo imager. If you expose through negative film, use analog plates; if you have a flexo imager, digital LAMS plates give finer highlights. Flexo imagers and plate processors are supplied with our partner factories — see the flexo CTP machine range if you are planning a move to digital.
Choosing by run needs and chemistry tolerance
Within a family, run needs and chemistry choose the grade:
- Plates scumming with UV inks? On thermal, a double-layer plate generally has better chemical resistance than single-layer; our single-layer thermal and CTcP plates can be baked but are not UV-ink resistant, so for UV inks choose the double-layer thermal plate or our processless plate.
- Long runs? Bakeable thermal grades plus a plate baking oven extend run length. Run length for each grade is stated in its TDS with test conditions — we do not quote one number for all presses.
- Less chemistry in the plate room? Processless thermal plates remove the developer and processor for suitable jobs; on flexo, water-wash or thermal-processing plates remove solvent washout.
- Keeping your processor? Thermal, CTcP and PS plates run through a plate processor with matched CTP developer, which we also manufacture.
Changing plate type does not always mean changing everything. Within the same imaging workflow you can often change grade — for example from single-layer to a double-layer thermal plate, or to processless — without new equipment. Only a change of imaging workflow (film to CTP, thermal to UV, film to flexo imager) needs new hardware.
How to confirm your choice with a trial
A plate type that looks right on paper still needs confirming on your press, with your inks, fount solution and substrate. Trial plates do not take too long if the test is planned: agree the grade, size and gauge, run a standard job, and record exposure, processing, dot reproduction and print quality. Our plate test protocol lays out the steps. Once the trial passes, the right plate for your press and inks becomes your standard order.
FAQ
How do I choose the right printing plate?
Decide in order: press type, imaging workflow (film, thermal CTP, UV/CTcP, violet or flexo imager), run needs such as UV inks and baking, and how much processing chemistry you accept. The workflow fixes the plate family; the other two choose the grade.
Which plate do I need for a thermal CTP platesetter?
A thermal platesetter images at 830 nm, so it needs thermal plates: single-layer thermal for general work, double-layer thermal for UV inks and harsh chemicals, or processless thermal plates if you want to remove processing chemistry.
What is the difference between CTP and CTcP plates?
CTP usually refers to thermal or violet plates imaged by lasers in a platesetter. CTcP plates are conventional-type plates imaged by UV light in a CTcP platesetter. They are not interchangeable; use the plate family that matches your platesetter.
When should I choose processless plates?
Choose processless thermal plates when you have a thermal platesetter, want to remove developer and processor from the plate room, and your jobs and inks suit the grade’s TDS. For UV inks or very long runs, a processed thermal grade is usually the safer choice.
Should I choose analog or digital flexo plates?
Choose analog flexo plates if you expose through negative film, mainly print line work and solids, or need the lowest plate cost. Choose digital LAMS plates if you have a flexo imager and print fine halftones and process colour.
What are the types of offset printing plates?
The main offset printing plate types are single- and double-layer thermal CTP plates, processless thermal plates, CTcP plates for UV platesetters, positive PS plates for film workflows, violet photopolymer plates and polyester plates for small-format presses.
Not sure which plate fits your press? Request a quote — send your press type, platesetter or imaging workflow, inks, plate sizes and gauges and monthly volume. 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.
