Overview
The Seiko 508GS green label is the solvent/UV configuration of the 508GS greyscale printhead — one of the most widely deployed industrial heads of the last decade. Its 508 independently addressable nozzles, 12–84 pL greyscale range and non-wetting nozzle plate deliver photo-quality results with minimal maintenance in ceramics, signage, textiles and coding & marking. The IRH2533U generation is the current replacement for the discontinued IRH2513 series and drops directly into printers designed for it.
Key Features
- 508 active nozzles across a 71.54 mm print width (180 npi)
- 12 pL base drop with multi-drop greyscale up to 84 pL
- Up to 28 kHz jetting and 320 µL/sec productivity per head
- Non-wetting nozzle plate with integrated guard and built-in damper
- Green label variant optimised for solvent and UV inks
- Direct replacement for the discontinued IRH2513 series
- Original new heads shipped in Seiko packaging with Head ID
Technical Specifications
| Manufacturer | Seiko Instruments Inc. (SII Printek) |
| Model | 508GS (Green Label) |
| Part number | IRH2533U (solvent/UV configuration) |
| Active nozzles | 508 |
| Print width | 71.54 mm |
| Native resolution | 180 npi (up to 720 dpi effective) |
| Drop volume | 12 pL base, multi-drop greyscale up to 84 pL |
| Grey levels | 4 |
| Firing frequency | up to 28 kHz |
| Max productivity | 320 µL/sec per head |
| Ink compatibility | Solvent / UV |
| Dimensions | 121 × 28.2 × 123.6 mm |
| Weight | < 300 g |
| Origin | Made in Japan |
Compatible Printers & Systems
Infiniti / Challenger FY-3208GS, FY-3208T, FY-3266T, FY-3286T; CrystalJet 6000; Crystek X5300; Forni HS1804; Icontek TW-1800J3/TW-3200F3/TW-3308HG/TW-3308MG; Kerajet K700; Leyenda 1800T3/3200F3; Nuocai NC-SPT2531; OraJet J18; DuPont Ichinose Artistri 3320.
Frequently Asked Questions
What is the difference between the green, blue and black label 508GS?
Identical jetting hardware (508 nozzles, 12–84 pL) — the difference is the internal fluidics: green label = solvent/UV, blue label (IRH2533U-1420) = aqueous/water-based only, black label (IRH2533U-2410) = UV-curable. Installing the wrong variant causes seal degradation and permanent head failure.
What does “up to 7 drops” greyscale mean?
Each nozzle can fire 1–7 drops per pixel position: 12 pL at minimum, up to 84 pL effective. Fine highlights use small drops, solids use large drops — producing smooth gradations without extra passes.
Is the IRH2533U a replacement for the IRH2513?
Yes. The IRH2533U is the current generation with the same drop volume and footprint but updated internal piezo technology, and drops directly into printers designed for the IRH2513.
Related products: Seiko 508GS Blue Label Aqueous Printhead, Seiko 508GS Black Label UV Printhead, Seiko SPT1020 35PL Printhead — see all Seiko printheads.
