Seiko 508GS 12PL Water Printhead IRH2533U-1420

The Seiko 508GS 12PL Water Printhead (IRH2533U-1420) is a genuine original Seiko Instruments grayscale drop-on-demand piezoelectric printhead for aqueous (water-based) ink applications. With 508 active nozzles across a 72mm print width at 180 dpi native resolution, a firing frequency of 18 kHz and multiples, and multi-drop grayscale capability delivering up to 7 drops per nozzle firing — enabling effective drop volumes up to 84 pl from a 12 pl base — it is purpose-built for high-volume wide-format aqueous production printing. Built-in damper assembly ensures consistent ink flow; integrated non-wetting nozzle plate and nozzle guard protect against contamination and physical damage. Compatible with Infiniti and other wide-format printer systems using aqueous inks. Every IRH2533U-1420 we sell at Digiprint USA is 100% genuine original Seiko Instruments.

Technical Specifications

Specification	Detail
Model	Seiko 508GS 12PL — Water/Aqueous variant
Part number	IRH2533U-1420 (Blue Label — aqueous)
Technology	Grayscale drop-on-demand piezoelectric
Total nozzles	508 active nozzles
Active print width	72 mm (71.8 mm nominal)
Native resolution	180 dpi
Max resolution	720 dpi
Firing frequency	18 kHz (and multiples)
Base drop volume	12 pl
Grayscale drops	Up to 7 drops per firing — up to 84 pl effective
Ink type	Aqueous (water-based) only
Nozzle plate	Non-wetting — resists ink adhesion and contamination
Damper	Built-in damper assembly — consistent ink flow
Nozzle guard	Integrated — physical nozzle protection
Dimensions (L × W × H)	126.3 × 99.2 × 32.9 mm
Weight	280 g
Country of origin	Japan (Seiko Instruments Inc.)
Condition	100% genuine original Seiko, brand new

Seiko 508GS — Water vs Solvent/UV: Critical Part Number Difference

Part Number	Ink Type	Label Colour
IRH2533U-1420 (this listing)	Aqueous / Water-based only	Blue Label
IRH2533U-2410	Solvent / UV inks	Different label

Compatible Printers

The Seiko 508GS 12PL water variant (IRH2533U-1420) is compatible with the following aqueous ink wide-format printers:

Contact our team with your printer make, model, and ink type to confirm IRH2533U-1420 (water) vs IRH2533U-2410 (solvent) compatibility before ordering.

Warranty Notice

Due to the sensitive nature of industrial printhead components, we cannot accept returns, exchanges, or refunds once the printhead has been installed. All sales are final. Always confirm your ink type and part number suffix (-1420 vs -2410) before ordering.

Why Buy from Digiprint USA

• 100% genuine original Seiko Instruments 508GS 12PL — IRH2533U-1420 water variant, manufactured in Japan

• -1420 vs -2410 variant clearly explained — the most critical 508GS buyer error, prevented before you order

• Full spec coverage — 508 nozzles, 180dpi native/720dpi max, 18kHz, up to 7-drop 84pl grayscale, non-wetting plate — most complete 508GS listing in the market

• Multi-drop grayscale context — we explain what "up to 7 drops" means for print quality decisions

• In stock in Doral, Miami FL — same day shipping before 2PM EST

• Ideal for Latin American Infiniti and wide-format aqueous production shops using Miami freight forwarders

• Free technical support — we confirm -1420 vs -2410 and printer ink type before you order

View our full range of genuine Seiko and industrial inkjet printheads.

Frequently Asked Questions

What is the difference between IRH2533U-1420 and IRH2533U-2410?
Both are Seiko 508GS 12PL printheads with identical core specs — 508 nozzles, 72mm print width, 180 dpi native, 18 kHz, 12pl base drop. The critical difference is the ink system configuration. The -1420 (this listing, Blue Label) is configured for aqueous water-based inks only. The -2410 is configured for solvent and UV inks. The ink system materials, seals, and internal ink path components differ between the two variants to withstand each ink chemistry. Installing -1420 in a solvent system or -2410 in an aqueous system will result in ink seal degradation, contamination, and permanent head failure. Always confirm your printer's ink type before ordering.

What does "up to 7 drops" grayscale mean — and how does it affect print quality?
The Seiko 508GS uses multi-drop grayscale technology: each nozzle can fire between 1 and 7 drops in rapid succession for each pixel position. At 1 drop, the effective drop size is 12 pl (minimum). At 7 drops, the effective drop size reaches approximately 84 pl (maximum). This multi-level control allows the head to produce a continuous tonal range — fine details and highlights use fewer, smaller drops; solid areas and deep shadows use more, larger drops. The result is smooth gradations and wide tonal range without requiring additional passes or dithering, contributing to high image quality at production printing speeds.

What does the built-in damper assembly do — and why does it matter?
The built-in damper on the Seiko 508GS acts as a pressure buffer between the ink supply system and the printhead's internal ink channels. It absorbs pressure fluctuations caused by the carriage moving at speed, ink supply system variations, and the rapid start-stop cycles of the printhead during printing. Without effective damping, these pressure spikes cause inconsistent drop formation — leading to banding, fill inconsistencies, and satellite drops. The built-in design eliminates the need for a separate external damper assembly, simplifying the ink path and reducing one common failure point in the overall system.

Do you ship the Seiko 508GS 12PL water printhead to Latin America?
Yes — same day shipping from our Doral, Miami FL warehouse before 2PM EST. Our Miami location is ideal for Latin American Infiniti and wide-format aqueous production shops using freight forwarders in the Doral area.

Tags: 508gs , Printhead , Seiko